MINERALS BENEFICATION
Title | INFLUENCE OF FERROMAGNETIC MATERIAL ON OXIDATION ABILITY OF TWO VALENCY IRON |
Authors | Mendykhanova G.K., Tusupbaev N. K., Umirbekova N.S. |
Author´s information | Institute of metallurgy and ore benefication, lab of flotation reagents and ore benefication, AlmatyMendykhanova G.K., undergraduate of KazNRTU Tusupbaev N. K., Doctor Tech. Sci, head of lab. Umirbekova N. S., junior scientific worker, naz_lov@mail.ru |
Summary | Studies on oxidation of Fe(II) to Fe(III) in acidic medium in the presence of oxidizers – hydrogen peroxide and air with using ferromagnetic catalyst of different sizes were led. Powdered ferromagnetic was obtained by mixing solutions of salts of two- and trivalent iron at temperature 70 0 C in the presence of 15 % ammonia solution. Solutions were intensive stirred for superfine particles obtaining. Ammonia using promotes the formation of homogeneous ferromagnetic particles at salts coprecipitation. The iron content in the material was 85 % by result of the chemical analysis. It is shown that the powdered paramagnetic catalysts with size 5–20 microns without a stabilizer are not effective for the oxidation of divalent iron to trivalent. The experimental data of the study of oxidation of ferrous iron to ferric showed efficiency of stabilized ferromagnetic catalyst (SFC). It is shown that at pH-1.5, process time of 7200 seconds and using 0.5 ml of hydrogen peroxide output of Fe(III) considerably lower (18.1 %), than at partnering SFC and hydrogen peroxide (38.2 %). Also the rate and the degree of ferrous iron oxidation to ferric depends on change of values of oxidation-reduction potential (ORP) of half-reactions of oxygen reduction and iron oxidation. Nanoscale ferromagnetic catalyst (NFC) influence was investigated. It is shown that time of oxidation Fe2+ to Fe3+ was 6-10 times shorter in the presence of NFC at the optimum amount of hydrogen peroxide. Furthermore, the catalyst NFC consumption 200 times smaller than catalyst SFC. In the presence of optimal stoichiometric amount of hydrogen peroxide and nanoscale ferromagnetic catalyst it is available to obtaining efficient sulfuric acid solution for uranium underground leaching. |
Key words | ferromagnetic material, iron sulfate, hydrogen peroxide, oxidation-reduction potential, nanoscale ferromagnetic catalyst, stabilized ferromagnetic catalyst |
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METALLURGY
Title | PILOT PLANT FOR FERROUS BAUXITES PROCESSING BY BAYER-HYDROGARNET TECHNOLOGY |
Authors | Abdulvaliyev R.A., Gladyshev S.V., Pozmogov V.A., Akhmadieva N.K., Bejsembekova K.O. |
Author´s information | Institute of metallurgy and ore benefication, lab of alumina and aluminium, AlmatyAbdulvaliyev R.A., Cand Tech. Sci, head of lab. Gladyshev S.V., Cand Tech. Sci, leading scientific worker Pozmogov V.A., Cand Tech. Sci, senior scientific worker Akhmadieva N.K., leading engineer Bejsembekova K.O., scientific worker, k.o.beisembekova@mail.ru |
Summary | Development trends of alumina production shows, that decreasing of high quality bauxite volume are the main reason of utilize low quality aluminium containing raw materials. As a result of laboratory research on ferrous bauxites of Koktalsk deposit in Kostanay region of Republic of Kazakhstan by Bayer-hydrogarnet technology process flow chart was designed. Technological scheme consists from 3 parts: red part of Bayer process; hydrogarnet processing of red mud, this part includes production of clinker by thermal treatment of batch which consists of fly ash, soda and limestone and further autoclave leaching of red mud with clinker and lime milk in high modulus aluminate solution; part for conversion of middle modulus aluminate solution. For research works on Bayer-hydrogarnet technology in “Institute of Metallurgy and Ore Beneficiation” JSC pilot plant was formed. The results showed that Al2O3 extraction efficiency from bauxite to solution is 85,4 %; Al2O3 extraction from red mud in to solution is 69,1 %;, total extraction of Al2O3from bauxite is 95,63 %. Material balance was calculated and Regulations on technical requirements was designed, and it can be use as base of project works for construction of new alumina production. Proposed innovative Bayer-hydrogarnet technology for alumina production is economical effective and ecological safety technology for processing low quality ferrous bauxite. |
Key words | ferrous bauxite, red mud, pilot-plant, process flowchart, non-standard equipment, alumina production |
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Title | THE VAPOR COMPONENTS PRESSURE ABOVE THE MELTS OF SELENIUM – TELLURIUM SYSTEM |
Authors | Burabaeva N.M., Volodin V.N., Trebukhov S.A., Tuleutaj F.H., Ersajynova A.A. |
Author´s information |
Institute of metallurgy and ore benefication, lab of vacuum processes, Almaty Burabaeva N.M., Cand Tech. Sci, scientific worker, Nuri_eng@mail.ru |
Summary | The method of boiling points was chosen on the basis of analysis of existing physical and chemical researches of the system selenium – tellurium for determination of total vapor pressure above melts with the subsequent accounting of a share of an element in the vapor phase determined by the analysis of the condensate obtained by a static method at a solution boiling temperature. Boiling point temperature was calculated on the basis of equality of the total vapor pressure and atmospheric pressure (101325 Pa). The partial pressure of selenium vapor over its melts with tellurium presented in the form of temperature and concentration dependence, as well as the partial pressure of tellurium vapor represented by similar dependence obtained by integrating the equations of Gibbs-Duhem were determined. Displaying partial and total dependences for temperatures of 550 °C (823 K) and 650 °C (923 K) showed that the total vapor pressure of the components of the alloys based on Se is almost equal to its partial pressure, as well as showed the presence of a minimum on the curves of components’ vapor total pressure near the tellurium edge of compositions. Extremum indicates the presence of inseparably boiling liquid – azeotrope at which evaporation melt composition is identical to that of the vapor phase. So, distillation separation of selenium and tellurium is possible to selenium and an azeotrope or tellurium and azeotrope. This is the reason of the difficulties in the separation elements of system by distillation methods. |
Key words | selenium, tellurium, binary system, melt, vapor pressure, boiling points method, inseparably boiling liquid, azeotrope |
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Title | INFLUENCE OF SUPERSATURATION COEFFICIENT ON BEHAVIOUR OF IMPURITY ELEMENTS AT TECHNICAL AMMONIUM PERRHENAT RECRYSTALLIZATION |
Authors | Zagorodnyaya A.N., Linnik K.A., Sharipova A.S., Abisheva Z.S. |
Author´s information | Institute of metallurgy and ore benefication, lab of rare scattered elements, AlmatyZagorodnyaya A.N., Doctor Tech.Sci., professor, main scientific worker,alinazag39@mail.ru Linnik K.A., engineer Sharipova A.S., Cand.Tech.Sci., scientific worker Abisheva Z.S., Doctor Tech.Sci., corresponding member of PK NAS, director of O.Baikonurov Mining-Metallurgy institute of KazNRTU |
Summary | Results of impurity elements behavior researches at pure ammonium perrhenate (PAP) obtaining from the technical ammonium perrhenate (TAP) by recrystallization were presented in the article. Influence of coefficient of supersaturation (α) in the range 1.2 – 4.4 with a step 0.4, which was calculated taking into account the solubility of NH4ReO4 at 95 ºC and 20 ºC, was studied. Conventional equipment for recrystallization experiments was improved. In work used the production TAP obtained by extraction technology with content, by weight % : 65.0 Re; 0.088, K; 0.0009, Fe; 0.022, Na; 0.031 Zn; 0.063, Cd; 0.008, Pb; 0.0002, Ni; humidity – 9.8. Other normalized elements (Al, Ca, Mg, Mn, Mo, Cu) were not found. The salt is maize yellow with impregnations of black color. According to the X-ray phase analysis salt is represented mainly by NH4ReO4. It was established that at cooling of the hot supersaturated solutions (α=1.2-4.4) increasing of precipitation temperature (19-51 0C), a sediment output (16.29–73.0 %) and recovery of following elements in it, by %: K 72.9 – 99.9; Re 14 – 75.7; Na 72.9 – 84.4; Zn 45 – 60.3; Cd 30 – 44.6, is observed . The main phase of sediment is NH4ReO4. Calculated crystallization coefficients are considerably > 1, coefficients of distributions increase in range 16.15 – 400. Along with increase α equilibrium concentration of elements in mother solution changes differently: Re 44–46 g/dm3; other elements, mg/dm3: K 19,51–0,2; Na 4,08–8,5; Zn 13,5–36,2; Cd 4,2–13,2; Fe 0,72–2,7; Ni 0,3–0,4. From mother solutions by combining processes of evaporation and crystallization salts of PAP were obtained. Purity of NH4ReO4 and its yield depend on initial solution: α=1.2 (APR-1, 64.36 %), α =2.0; 2.4 (APR-0, 54.81; 42.28 %), α =2,8–4,4 (ARR-00, 34.41–18.33 %). It was recommended taking into account parameters of dissolution for obtaining of necessary brand salt. |
Key words | technical ammonium perrhenate, pure ammonium perrhenate; recrystallization, supersaturation coefficient |
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Title | EXTRACTION OF URANIUM FROM URANIUM-CONTAINING RAW MATERIALS |
Authors | Kenzhaliyev B. К., Berkinbayeva А. N., Dosymbayeva Z.D., Sharipov R. Kh., Chukmanova М. Т. |
Author´s information |
Institute of metallurgy and ore benefication, Almaty Kenzhaliyev B. К., General director, Doctor Tech.Sci., professor, Vice-Rector for Innovation of Kazakh-British Technical University Kazakh-British Technical University, Research Laboratory of advanced materials and technologies, Almaty Berkinbayeva А. N., Cand Tech.Sci, senior scientific worker, freedom.k@mail.ru |
Summary | The article represents the results of a study on a comparative sulfuric acid catalytic oxidation of uranium (IV) from uranium-containing ore to uranium (VI) at stationary conditions. In this ore (the content of uranium, recalculated on uranium oxide is 17.18 %) the basic mineral is coffinite U[SiO4] which presence in the general balance of uranium mineralization is about 95 %. Uranium leaching studies were conducted using a ferric (III) solution, ammonium persulphate (APS) and sodium peroxoborate (SPB). Selectivity of catalyst M-1 on oxidation of uranium was determined. Applying the catalyst M-1 as an enhancer, uranium concentration in the sulfuric solution increases (S:L = 1:4), at which the further increase in the uranium concentration in the solution remains constant and equals to 86 mg/dm3. Two aspects were studied such as the increase in extraction of uranium by the sulfuric acid leaching from the poorly soluble uranium ore in the presence of a catalyst, and the possibility to complete its recovery by an increase of the process time. It was concluded that there is a need to conduct a study on the effect of mineralogical features of various uranium deposits on the efficiency of process of uranium extraction into solution. Thermodynamic data show a high probability of simultaneous behaviour of reaction of the uranium oxides with the sulfuric acid and reaction of calcium silicate with the sulfuric acid in the leaching process. |
Key words | uranium, sulfuric acid leaching, catalyst, oxidizing agent, thermodynamic analysis |
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Title | WATER LEACHING OF THE IMPURITIES FROM CAKE OF TITANIUM SLAG WITH SODA |
Authors | Naimanbayev M.A., Lokhova N.G., Abisheva A.E., Maldybaev G.K., Akchulakova S.T. |
Author´s information | Institute of metallurgy and ore benefication, Lab of titanium and rare refractory metals, AlmatyNaimanbayev M.A., Cand. Tech. Sci., head of lab., madali_2011@inbox.ru Lokhova N.G., senior scientific worker Abisheva A.E., junior scientific worker Maldybaev G.K., doctoral candidate of KazNRTU, leading engineerLab of physical methods of analysisAkchulakova S.T., Cand. Tech. Sci., leading scientific worker |
Summary | Improving the quality of titanium slag, obtained by smelting of titanium-magnetite concentrates, comprises titanium slag sintering with soda, subsequent water leaching of cake, during which some impurities pass into the solution. This technological method is important in the production of pure titanium dioxide. Therefore the impact of certain factors on the behavior of the components at the processing the cake of ill-conditioned low-titanium slag with soda by water was studied. It was studied influence on leaching process parameters: temperature in the range 30-90 °С, process duration in the range 5-60 min, ratio S:L in the range 1:4÷10, size of sample particles in the range -40 up to +160 micrometer. In the cake of titanium slag with soda 94.4 % of titanium is presented in the form of sodium titanate of various composition Na2TiO3, Na8Ti5O14, Na2Ti7O15. In the process of water leaching of the cake crystal structure of sodium titanates is saved. Sodium Na+ replacement on Н+ is not observed. It is found that at interaction of the cake components with water manganese, aluminum, silicon and iron form new slightly soluble in water compounds such as manganese oxide, sodium aluminate, hematite and pyrope. Optimal conditions for water leaching of cake of titanium slag with soda were experimentally determined. They are temperature 50 °С, duration 20 min, ratio S:L=1:5, size of particles +40–63 micrometer. Leaching of cake components into the solution at this conditions is, %: vanadium for 96,5; chromium for 86,5; sodium for 47,3; aluminium for 13,3 and silicon for 10,3. |
Key words | titanium slag, oxidizing roasting, water leaching, X-ray analysis, sodium titanate, impurity |
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Title | PHASE FORMATION AT SINTERING DURING COMPLEX PROCESSING OF OXIDIZED LEAD-ZINC BARITE ORES |
Authors | Sokolovskaya L.V., Kvyatkovskiy S.A., Semenova A.S., Kim L.P., Sejsembayev R.S. |
Author´s information | Institute of metallurgy and ore benefication, Lab for pyrometallurgy of heavy non-ferrous metals, AlmatySokolovskaya L.V., Cand Tech. Sci, senior scientific worker Kvyatkovskiy S.A., Doctor Tech. Sci, head of lab., kvyatkovskiy55@mail.ru Semenova A.S., leading engineer Kim L.P., leading engineer Sejsembayev R.S., doctoral candidate |
Summary | The processes of phase formation, occurring during sintering of oxidized lead-zinc ore of Alashpay deposit were studied. Technological scheme of oxidized ore complex processing with application of thiosalts metallurgy method includes sintering, sinter leaching, getting cake, melting the cake onto lead and zinc containing slag, barium extraction from sulfide-alkaline solution. The phase formation processes at charge sintering were researched in dependence on temperature within 400-900 0C, sintering time – 2-2.5 h., charge composition, where sodium sulfate and carbon reducing agent content are changed within 20-30 % and 12-15 % correspondingly. It was found, that nonferrous metal thiosalts formation during Alashpay deposit oxidized ore sintering begins higher 550 0C. The solid solutions like Pb1-xNaxS are formed at 575 0C, compounds Na2ZnS and Na2ZnS4 – at 600-610 0C. At temperatures higher than 600 0C phase formation of barium metasilicate BaSiO3, sulfate compound (BaSO3)0,3(SO4)0,7, and series of continuous solid solutions 2BaO3SiO2, 5BaO8SiO2, 4BaO6SiO2, 2BaO4SiO2 was found. Increasing temperature up to 800 0C leads to barium thiosalts formation: BaCu2S4Sn, BaFe2S4, Ba3FeS5, Ba9Fe4S15. Increasing sintering temperature up to 900 0C results in barium sulfide formation, and decomposition of thiosalts onto sulfides. It is observed intensification of sublimation of volatile components such as arsenic and sulfur. Increase sodium sulfate and carbon reducing agent content in the charge leads to getting sinter, containing more amount of sodium, connected into thiocompounds, metal contents in sinter decreases. System including oxidized Alashpay deposit ore, sodium sulfate and carbon reducing agent comes to a stable state with formation of nonferrous metals thiosalts at temperatures 750-850 oC, content of Na2SO4 25 %, carbon reducing agent – 12-15 %. |
Key words | oxidized ore, sodium sulfate, carbon reducing agent, low temperature sintering, nonferrous metals thiosalts, sodium sulphide |
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Title | SMELTING OF COPPER-CONTAINING OXIDIZED ORES OF AKTOGAY AND BOSCHEKUL DEPOSITS WITH THE NIKOLAEV CONCENTRATE |
Authors | Shamgunov A.S., Kvyatkovskiy S.A., Semenova A.S., Sejsembayev R.S., Omirzakov B.A. |
Author´s information | Institute of metallurgy and ore benefication, Lab for pyrometallurgy of heavy non-ferrous metals, AlmatyShamgunov A.S., scientific worker Kvyatkovskiy S.A., Doctor Tech. Sci, head of lab., kvyatkovskiy55@mail.ru Semenova A.S., leading engineer Sejsembayev R.S., doctoral candidate Omirzakov B.A., engineer |
Summary | In the article the results of the smelting mixtures of Aktogay and Boschekul ore deposits, and Nicholaev concentrate are given. Ores have the following chemical composition, %: Aktogay – SiO2 – 64,56; CaO – 1,53; S – 0,03; MgO – 0,0; Fe – 1,44; Cu – 0,32; Al2O3 – 0,0; Boschekul – SiO2 – 55,2; CaO – 0,18; S – 0,0; MgO – 1,22; Fe – 0,0; Cu – 1,79; Al2O3 – 17,99. Chemical composition of Nicholaev concentrate, %: SiO2 – 3,6; CaO – 0,91; S – 35,17; MgO – 1,22; Fe – 27,5; Cu – 17,5; Al2O3 – 1,54. The experiments were performed in furnace SNOL in oxidizing atmosphere at 1350, 1400 and 1450 ° C, the ratio of ores of deposits Aktogay and Boschekul for each temperature was 1:4, 2:3, 3:2, 4:1. The resulting smelting mattes’ chemical composition were analyzed, data on content wherein copper, iron, sulfur, zinc, lead, gold and silver were presented. The resulting slags were examined by X-ray analysis. The analysis of results, conducted by a computer program created for smelting copper raw material calculations, showed that the composition of the products can be obtained at degree of desulfurization about 42–45 %. Optimal compositions of the charge for smelting, including Aktogay and Boschekul oxide ores, have been worked out. Acceptable by chemical composition smelting products have been obtained. Oxide ores of Aktogay and Boschekul were not used as quartz-flux components in the autogenous smelting despite the fact that these materials are accessible. These ores have the availability to smelt at existing plants in Kazakhstan, as well as newly created copper plants. Studies have proven the ability to use them as flux material. The research results are necessary for testing regimes of smelting of copper concentrates and oxidized ores of Aktogay and Boschekul as quartz-flux components in the Vanyukov smelting furnace. |
Key words | copper ore, oxidized ore, sulfide copper concentrate, matte, slag, flux, furnace charge, pyrometallurgy |
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PHYSICAL-CHEMICAL STUDIES
Title | PHASE DIAGRAM IRON AND Selenium at low pressure |
Authors | Volodin V.N., Trebukhov S.A., Burabaeva N.M., Nitsenko A.V., Kasymzhanova A.K. |
Author´s information | Institute of metallurgy and ore benefication, lab of vacuum processes, AlmatyVolodin V.N., Doctor Tech.Sci., Doctor Phys -Math. Sci., professor, main scientific worker Trebukhov S.A., Cand Tech. Sci, Deputy general director Burabaeva N.M., Cand Tech. Sci, scientific worker, Nuri_eng@mail.ru Nitsenko A.V., Cand. Tech. Sci., head of lab. Kasymzhanova A.K., leading engineer |
Summary | Based on the vapor pressure values of elemental selenium and ferrous monoselenide the equilibrium diagram of ferrum and selenium state under the pressure of 100 Pa was drawn with the determination of liquid, crystal and vapor phases coexistence field boundaries. The coexistence field boundaries of condensed and vapor phases are calculated by assuming the existence of extremely diluted solutions of ferrous monoselenide in iron and selenium in iron. Boiling point of solutions was determined as fragmentary due to the lack of thermodynamic constants for concentration intervals corresponding to the compositions of FeSe–FeSe2 and solution (γFe). At calculating melts and vapor coexistence field boundaries the boiling point was assumed equal to the temperature at which the sum of partial pressures of vapor components is 100 Pa, and the vapor phase composition was determined as the ratio of the partial pressure of the component to the total pressure. The place of phases coexistence fields and their boundaries position in the diagram show that the composition of the vapor phase consists of selenium almost entirely up to the boiling point of elemental iron. When vacuum heat processing raw materials containing selenium with iron alloys the latter concentration shall be expected in the last distillation residue predominantly in the form of iron diselenide. Considering the interaction of selenium with constructional steels in relation to the distillation process, viability of implementation of the process for selenium containing materials distillation separation and selenium refining in a batch mode, in order to avoid shifting of the equilibrium towards the formation of iron selenide has been concluded. |
Key words | selenium, ferrous monoselenide, ferrous diselenide vapor pressure, state diagram, boiling, vapor composition, distillation, pressure |
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Title | MODIFIED SORBENT BASED ON BENTONITE CLAY FOR CADMIUM (II) IONS EXTRACTION FROM AQUEOUS SOLUTIONS |
Authors | Imangalieva A.N., Sejlhanova G.A., Akbaeva D.N., Rakhym A.B., Kenzhalina Zh.Zh. |
Author´s information |
Kazakh National University named after al Farabi Imangalieva A.N., doctoral candidate, This email address is being protected from spambots. You need JavaScript enabled to view it.”> runia_i91@mail.ru |
Summary | This paper presents the results of a study of textural and sorption characteristics of sorbent based on bentonite clay (BC) from Dinosaur deposit and modified by polyethylene glycol (PEG). It is shown that practically all the adsorption and textural characteristics were significantly improved by modifying BC. The specific surface area of the original BC obtained by the BET (Brunauer Emmett Teller) method equal to 3 m2/g increased almost 11 times and becomes 32 m2/g. Based on results of scanning electron microscopy (SEM) and increase of adsorptive activity on iodine it was determined that the surface modified sorbent has practically inhomogeneous texture provided with predominantly micropores, which an average size is 1.71 nm. The sorption constants of Cd2+ ions were calculated by the theories of Langmuir and Freundlich, which are 173.160 (dm3 ∙ mg-1) and 258.820 (mg ∙ g-1) (dm3 ∙ g-1) n, respectively. It is found that the process of cadmium ions sorption is described by the Langmuir monomolecular theory, which is characterized by the presence of active sites on the adsorbent surface. Optimal conditions for process of Cd2+ ion sorption under static conditions: modified sorbent, obtained from BC and 1 % solution of PEG, reactants contact time – 20 min, at which the degree of extraction reaches up to ~ 99.0%. Obtained in the work sorbent based on bentonite clay can be used for the treatment of wastewater from cadmium ions. This contributes to solving one of the pressing issues in the field of ecology and environmental protection. |
Key words | bentonite clay, polyethyleneglycol, cadmium, sorption, adsorption isotherm |
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Title | CALCULATION ESTIMATE OF ARSENIC VAPOR COEFFICIENT OF DIFFUSION THROUGH POROUS MEDIUM |
Authors | Nitsenko A.V., Trebukhov S.A. |
Author´s information |
Institute of metallurgy and ore benefication, lab of vacuum processes, Almaty Nitsenko A.V., Cand Tech. Sci, head of lab., This email address is being protected from spambots. You need JavaScript enabled to view it.”>аlina_nitsenko@gmail.com |
Summary | Arsenic is one of the admixture elements subject to prior removal out of metallurgical raw materials. It is connected with its negative effect on the technology and the environment. One of the most effective ways to its extract is a thermal treatment in vacuum. It is necessary to have knowledge of the physical laws of mass transfer and information about the kinetic coefficients for calculation and design of apparatus for raw materials processing. In inspection of the published papers about gas dynamics of sublimation processes was ascertained lack of information about arsenic diffusion. Therefore, we carried out a calculation of arsenic effective diffusion coefficient through a porous filter with experimental data verification. The calculation of diffusion coefficient was done through the use values of diffusing gas molecular diffusion, porosity, filter permeability, also Stephan-stream amendment. Temperature dependence of the arsenic vapor diffusion coefficient through porous filter at various residual pressure in system and filling fineness were obtained as a result of the calculation. It was ascertained that the value of the diffusion coefficient increases with fineness of filter grain increase, system pressure decreasing and temperature increasing. Experimental value of the arsenic vapor diffusion coefficient through quartz filling was obtained by steady flow for the purpose of accuracy check of the calculated data. Based on the conducted work it concluded that the selected equation is quite suitable for the calculation of the diffusion coefficient of arsenic vapor through a filter from inert material with a glance of error. Value of error is connected with the carrying out additional calculations of unknown quantities during calculation of molecular diffusion. |
Key words | diffusion coefficient, arsenic, quartz, calculation, pressure, temperature |
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Title | ESTIMATION BY MATHEMATICAL MODELING PROCESS OF ZINC SULPHURIC-ACID LEACHING FROM HARD-DRESSING OXIDIZED ZINC ORE |
Authors | Mamyachenkov S. V., Ramazanova R. A., Bykov R. A., Seraya N. V. |
Author´s information |
The first President of Russia B.N.Yeltsin’s Ural Federal University, Cathedra for metallurgy of heavy non-ferrous metals, Ekaterinburg, RussiaMamyachenkov S. V., Doctor Tech. Sci, professor D. Serikbaev’s East Kazakhstan state technical university, Cathedra for chemistry, metallurgy and benefication, Ust Kamenogorsk Ramazanova R. A., doctoral candidate, raigul_77_33@mail.ru |
Summary | Determination of optimal characteristics of zinc sulphuric-acid leaching is coming from in-depth study of process, application of modern research methods and electronic systems of information processing. In this research raw material is hard-dressing oxidized zinc ore containing zinc, lead, copper, iron, calcium, magnesium, aluminum, manganese and silicon. Paper observes the mathematical model of zinc sulphuric-acid leaching from the hard-dressing oxidized zinc ore. Obtained theoretical models permit exactly enough describe flowing processes and admit extrapolation to places of the factor space where direct observation of these processes is impossible. Statistical data processing models are notable for hard link of experimental design and regression equation in the shape of polynomial. Derived model affords to determine consumption of various factors as concentration of sulphuric acid, duration and temperature of leaching, and to optimize process of zinc sulphuric-acid leaching from the hard-dressing oxidized zinc ore. Mathematical model can be used in the design of new hydrometallurgical systems and to analyze working of efficient hydrometallurgical systems, and also for solution of problems as setting of expendable raw material rates, technological parameters and determination of unknown losses of raw material’s components under industrial field conditions. |
Key words | leaching, mathematical model, process factors, oxidized zinc ore, recovery, optimization |
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MATERIALS TECHNOLOGY
Title | TECHNOLOGIES FOR PRODUCTION OF CARBON-FILLED PLASTIC PLATES |
Authors | Zaberezhnyj S.A., Ismailov M.B., Bajserikov B.A. |
Author´s information | The National center of space exploration and technologies, department of cosmic material technology and instrumentation technology, AlmatyZaberezhnyj S.A., holder of a master’s degree, junior scientific worker Ismailov M.B., Dr. Tech. Sci., professor, Director of Dep., This email address is being protected from spambots. You need JavaScript enabled to view it.”>m.ismailov@spaceres.kz Bajserikov B.A., holder of a master’s degree, junior scientific worker |
Summary | Currently one of the major trends of development in aerospace industry is searching of new advanced materials. One of such advanced materials is carbon- plastic, which is strong and lightweight with great corrosive resistivity. In the current paper basic analysis of carbon-plastic’s components are carried out. Two types of epoxy resin (ED-20 and Etal-257u) were examined. For given resins optimal proportion of hardener were determined: for ED-20 is 15 % and for Etal-257u – 27.5 %. Conditions of resin curing and its heat treatment were studied. Heat treatment is carried out at temperature 120 °С for 8 hours. Such processing improves tensile strength of obtained samples by 20 %. Comparing of three methods of carbon-plastic moulding was studied, namely method of mechanical press moulding, vacuum moulding and vacuum infusion. Research showed that samples obtained by vacuum infusion have higher concentration of carbon fiber and less porosity which leads to better strength in comparison with other two methods. Hereafter for further researches vacuum infusion method only was used and improved as most advanced. For chosen method a laboratory machine for producing of carbon-plastic plates was constructed and the technology was developed. The samples which have mat rough surface with low porosity, containing 70 % of carbon fiber and have tensile strength 367 MPa were obtained by this method. |
Key words | carbon-filled plastic, epoxy resin, heat treatment, mechanical press moulding, vacuum moulding, vacuum infusion, tensile strength |
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Title | RATIONAL METHODS FOR THE FORMATION OF STRUCTURE OF COMPOSITIONAL MAGNESIA MATERIALS |
Authors | Miryuk O.A. |
Author´s information |
Rudnyj Industrial Institute, Cathedra of building and construction materials technology, Rudnyj Miryuk O.A., Doctor Tech. Sci., professor, head of cathedra, psm58@mail.ru |
Summary | The results of studies of composite materials of various structures on the basis of magnesia binders and fillers from production waste were presented. Compositions were obtained using the mixed binder, including caustic magnesite and tailings of skarn-magnetite ores. As technogenic fillers used tailings of skarn-magnetite ores, saw dust, waste of heat-power engineering, regenerated foam polystyrene. The influence of method of preparation of the molding mass on strength properties of composite materials of various structures is established. Rational technological methods for preparation of the molding composition depend on the type of filler. Peculiarities of preparation of magnesium compositions with fine-grained structure were revealed. The expediency of the liquid component primary contact with technogenic filler is showed. The initial preparation of the suspension of the binder and the subsequent phased introduction of the fillers is preferably for compositions of the combined structure. Mechanical properties of composite materials were determined. the microstructure of materials of different composition was investigated by the method of electron microscopy. Advantages of the magnesia composite materials were noted. The basic directions for using the composite materials with different structures are indicated. |
Key words | magnesia binder, composite materials, fillers, structure, production waste |
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Title | INTERACTION OF TITANIUM ALLOYS WITH DIFFERENT REFRACTORY COMPOUNDS |
Authors | Panichkin A.V., Uskenbayeva A.M., Imanbayeva A.B., Temirgaliev S.S., Dzhumabekov D.M. |
Author´s information | Institute of metallurgy and ore benefication, Lab of Materials Technology, AlmatyPanichkin A.V., Cand Tech. Sci, head of lab. Uskenbayeva A.M., engineer Imanbayeva A.B., engineer, doctoral student Temirgaliev S.S., engineer, undergraduate Dzhumabekov D.M., engineer |
Summary | The prospects of the development of new refractory materials for the manufacture of crucibles vacuum induction furnaces for melting and casting of titanium and its alloys were shown. The results of thermodynamic calculations and experimental studies on the interaction of different refractory materials with titanium at temperatures above its melting point were presented with the purpose of selection of refractory materials with minimal interaction with titanium melts. The thermodynamic calculations using OutotecHSCChemistry 8 program showed that most considered refractory compounds and substances of which can be manufactured refractory materials react with titanium melts. Exceptions are CaO, MgO, ZrB2, ZrO2 because the Gibbs energy, enthalpy and entropy of the reaction of these compounds with titanium is positive up to 2000 ° C. Experiments on designed installation of high-speed heating and by using a vacuum induction furnace were carried out and transient interaction of a number of powders of refractory materials with liquid titanium of VT1-0 brand was investigated. It is shown that at the first seconds after melting titanium melt begins to interact extensively with them, and the formation of new compounds and their intensive wetting and impregnation develops. A distinctive feature of the titanium interaction with CaO, MgO is actively spreading and swirling of the melt, caused by the reduction of calcium and magnesium to the metallic state and boiling. Experimental data on the momentary titanium melt interaction with the walls of the crucible of dense graphite grade MPG7, whereby the formation of titanium carbide in the transition zone is much slower compared with graphite powder. That makes it possible to use it as a refractory material for an induction melting of casting titanium alloys and producing castings for the production of light duty parts. |
Key words | titanium melt, refractory material, reacting, harmful impurities |
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INORGANIC MATERIALS FROM MINERALS
Title | URANIUM SORPTION FROM LAKE WATER BY NATURALSORBENTS AND PRODUCTS OF THEIR MODIFICATION |
Authors | Samojlov V.I., Zelenin V.I. ,Saduakasova A.T., Kulenova N.A. |
Author´s information | D. Serikbaev’s East Kazakhstan state technical university, Ust KamenogorskSamoilov V.I., Dr. Tech.Sci., PhD, docent Saduakassova A.T., doctoral student, a_saduakasova@mail.ru Kulenova N.A., Cand Tech. Sci., associate professor, head of cath.The first President of Russia B.N.Yeltsin’s Ural Federal University, Ekaterinburg, RussiaZelenin V.I., Dr. Tech. Sci., professor of cath. «Рhysical colloidal chemistry» |
Summary | At present time hydro-mineral raw material is one of the perspective sources for metals extracting by sorption, particularly uranium. In the paper suitability of natural sorbents using is shown. In the researches natural schungite of Koksu deposit (Almaty region), natural zeolite of Tajzhuzgen deposit (East Kazakhstan region) and products of their modification were used as sorbents. Modification of natural schungite and zeolite consists in simultaneous chemical precipitation of copper (II) and nickel (II) hydroxides on the surface of natural sorbents. Sorption capacity of indicated sorbents and products of their modification was studied for uranium extraction from the lake water by use samples from Alakol Lake (East Kazakhstan region), water of this lake contains tens µg/dm3 of uranium. According to prognostic estimation uranium amount in Alakol Lake is equal to hundreds of thousands tones. Sorbents modification and sorption processes terms were determined. It was shown that schungite and zeolite extract from this water in static conditions of sorption about 92 % of uranium. Products of modification of natural schungite and zeolite in analogous sorption conditions extract 93÷96 % of uranium. Results of work can be used at development of technology for uranium extraction from hydro-mineral sources and waste waters of production plants. |
Key words | sorption, uranium, schungite, zeolite, copper hydroxide, nickel hydroxide, lake water |
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Title | FEATURES OF SUBSTANTIAL COMPOSITION OF DARBAZINSK DEPOSIT’S BENTONITE CLAY |
Authors | Tleuov A.S., Tleuova S.T., Issayeva D.A., Kadyntseva T.A. |
Author´s information |
M. Auezov’s South Kazakhstan State University, department “Chemical technology of inorganic substances” regional testing laboratory of engineering profile, Shymkent Tleuov A.S., Dr. Tech. Sci., professor |
Summary | Recently works aimed at search of new ways to phosphorus recovery from the sludge by using solid sorbents with developed surface interest. So possibilities of bentonite clay using as adsorbent for extraction of phosphorus from phosphoric slime are studied. Results of researches of basic rockforming minerals, morphology, element and weight composition of bentonitic clay samples from three fields of Darbazinsk deposit are presented. Bentonitic clays will be applied for recovery of phosphorus from phosphoric slime with further use as raw material for complex PK-fertilizers producing. Bentonite clays are widely prevalent and their composition and properties usually vary with the geological conditions of the area, depth of bedding and other factors. Physical and chemical methods of the analysis as raster low-vacuum electronic microscope and the IR-spectrophotometer were used for determination of element composition and micro-structural features of the Darbazinsk clays samples. According to the carried out analyses data the studied bentonites are characterized by existence of minerals of montmorillonite and kaolinite, also admixtures as feldspar minerals, silica-alumina compounds and ferrite phases. The mineralogical composition of the studied clay includes montmorillonite, which content varies from 25 % to 60 %. The tested clays swelling there are in the interval from 4 up to 8. The bulk of the clay refers to a finely dispersed material. The content of particles with size less than 0.005 mm is varied in range 80–95 %. |
Key words | phosphoric slime, sorbents, bentonite clay, montmorillonite, kaolinite, silica-alumina, PK fertilizer |
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INDUSTRIAL WASTE UTILIZATION
Title | PRODUCTION OF CONSTRUCTION MATERIALS FROM ASH-AND-SLAG WASTE OF ALMATY HEAT STATION-2 |
Authors | Gladyshev S.V., Abdulvaliyev R.A., Sayakhov R.I., Usmanov N.V., Kuznetsova G. V. |
Author´s information | Institute of metallurgy and ore benefication, lab of alumina and aluminium, AlmatyGladyshev S.V., Cand Tech. Sci, leading scientific worker Abdulvaliyev R.A., Cand Tech. Sci, head of lab.FSBEIHPE “Kazan National Research Technical University”, Kazan, RussiaSayakhov R.I., master of the department of inorganic matters and materialsResearch and Design Institute “Technopolis” JSC, Kazan, RussiaUsmanov N.V., Director of JSCKazan State architecture and building University, Kazan, Russia Kuznetsova G. V., assistant professor of the department of construction materials, products and constructions technology |
Summary | The results of a work on scientific and technical cooperation for the production of silicate products from ash of Ekibastuz coal combustion are presented. The joint work was carried out within the framework of cooperation between Center of Earth Scienses, Metallurgy and Benefication (Almaty) and Research and Design Institute “Technopolis” (Kazan, Tatarstan, Russia). The possibility of recycling ash and slag mixture of Almaty heat station-2 and Barnaul heat station-2 slag by use in the construction industry as a raw material for the production of silicate brick. Compounding was selected and brick production technology features were studied, especially based on heat station waste only and waste mixed with sand. It was determined that the use of pure Barnaul slag for the production of silicate bricks is not possible, because samples from slag has extremely low strength due to its high content of amorphous and glass-like SiO2, which negative effects on the strength characteristics of the products and large-scale fraction of grains. The best compressive strength after hydrothermal treatment of the samples, which consist of ash and slag mixture and slag, are achieved by adding 70 % and above ash and slag mixture. The strength of these samples was 17,7-17,8 MPa and reaches brick mark M175. Addition of 10 % sand to the ash and slag allowed raising mark of products from M175 up to M200. Further increasing proportion of sand to 20 % does not lead to a further increase of the compressive strength, and even decreases it slightly. Increase of the sand proportion to 30 % is fallen the calculated brand of products to M150. It has been established that a major impact on the basic characteristics of both raw material and products has not only the chemical composition of the charge, but also the grain-size distribution. The best results of the compressive strength show those samples, which batch is polydisperse and Barnaul slag serves only as a enlarge addition and is contained in an amount not more than 30 % by weight of the charge. The addition to the charge of sand in an amount more than 10 % results in increase of the proportion of large silica particles which are more difficult to react with binder formation and require different processing conditions in the autoclave. |
Key words | silicate brick, ash and slag brick, ash and slag wastes, lime, sand, recycling, strengthtest, water absorption |
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MEMORABLE DATE
Title | TO 100 AGE MEMORY OF ACADEMICIAN OF KAZAKHSTAN REPUBLIC NATIONAL ACADEMY OF SCIENCES ELIZAVETA IVANOVNA PONOMAREVA |
Authors | Kenzhaliyev B. К. |
Author´s information | Institute of metallurgy and ore benefication, AlmatyKenzhaliyev B. К., General director, Doctor Tech.Sci., professor, Vice-Rector for Innovation of Kazakh-British Technical University |