Minerals benefication
Solozhenkin P.M. Forecasting of clusters of platinum group elements minerals flotation according to quantum mechanics conception
Title | Forecasting of clusters of platinum group elements minerals flotation according to quantum mechanics conception |
Authors | Solozhenkin P.M. |
Author´s information | FSBSO “Institute for problems of complex development of mineral resources“ Russian academy of sciences, Moscow, Russia Solozhenkin P.M., Dr. Tech.Sci, academician of Academy of Sciences of Tadjikistan, solozhenkin@mail.ru |
Summary | In the article clusters of minerals of elements of platinum group (EPG) and compounds on the basis of phosphorus (III) – analogues of di-alkyl-dithiocarbamates are discussed. Molecular models of clusters EPG and reagents of type (С2H5)2PCS2Н, (C2H5)2PCOSН, (C2H5)2PCSOН have been created. Physical and chemical parameters of the compounds are determined by molecular modelling with using programs ChemOffice Combridge Soft, MOPAC 2012. Technique for binding of collector with atoms of minerals clusters with complex formation is presented. For complexes, clusters, minerals and collectors charges of atoms, distance between the collector and atom of a mineral, energy value and level of molecular orbital’s are determined. The forecast of an estimation of activity of collectors (FEAC), is offered, which is calculated for EPG minerals clusters. It is stated, that FEAC can characterize flotation of minerals. Application of this index at Pt, Pd – containing ores flotation is analyzed. |
Key words | platinum group elements minerals, molecular modeling, flotation reagents, programs ChemOffice Combridge Soft, MOPAC, collectors activity estimation forecast |
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Metallurgy
Babazhanov D.R., Dabaev A.I., Kasymzhanov K.K., Barkytova B.N. Influence of seeding agent on hydrolytic sedimentation of tungsten trioxide
Title | Influence of seeding agent on hydrolytic sedimentation of tungsten trioxide |
Authors | Babazhanov D.R., Dabaev A.I., Kasymzhanov K.K., Barkytova B.N. |
Author´s information |
“Center of Earth sciences, metallurgy and ore benefication” JSC, lab of titanium and rare refractory metals, Almaty Babazhanov D.R., leading engineer, babazhanov_d@mail.ru. Dabaev A.I., Cand Tech.Sci, head of sector Kasymzhanov K.K., junior scientific worker Barkytova B.N., engineer |
Summary | At processing substandard scheelite concentrates by autoclave-carbonate leaching method lean (21 g/dm³) and steady-state solutions are obtained. Deposition of tungsten trioxide from them takes long time. The results of the study to reduce period of tungsten trioxide deposition from poor solutions are presented in the article. The conditions for maximizing tungsten trioxide recovery by adding seed agent at hydrolytic method are determined. Addition of tungstic acid as seeding agent can significantly reduce the duration of the process of tungsten trioxide deposition due to reducing the incubation period. The resulted precipitate of tungsten trioxide has increased particles size (45-96 microns). |
Key words | seeding agent, hydrolytic deposition, tungsten trioxide, tungstic acid, scheelite concentrate |
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Bochevskaya Ye.G., Abisheva Z.S., Zagorodnyaya A.N., Aytkaliev T.N., Zhumabekov Zh.Zh., Sargelova Eh.A. Osmium and rhenium precipitation from wastewater of copper production with using of different reagents – precipitants
Title | Osmium and rhenium precipitation from wastewater of copper production with using of different reagents – precipitants |
Authors | Bochevskaya Ye.G., Abisheva Z.S., Zagorodnyaya A.N., Aytkaliev T.N., Zhumabekov Zh.Zh., Sargelova Eh.A. |
Author´s information |
“Center of Earth sciences, metallurgy and ore benefication” JSC, lab of rare scattered elements, Almaty Bochevskaya Ye.G., Cand Tech. Sci, leading scientific worker elena_bochevskaya@mail.ru Abisheva Z.S., Dr. Tech.Sci., corresponding member of RK NAS, president of “CESMOB” JSC Zagorodnyaya A.N., Dr. Tech.Sci., chief scientific worker Sargelova Eh.A., engineer RGE “Zhezkazganredmet”, Zhezkazgan Aytkaliev T.N., deputy director on production and science Zhumabekov Zh.Zh., rare metals machine-shop deputy manager |
Summary | The results of the investigation on choose of optimal conditions for maximum precipitation of osmium and rhenium from wastewater were represented in the paper. Effects of reagents concentration, process duration and temperature at precipitation of osmium and rhenium from original solution by reagent – precipitants: sodium thiosulfate and sodium sulfide were investigated. It was established, that temperature is the main factor, which influences on recovery of osmium and rhenium into precipitate at the optimal amounts of added reagents. The substantial composition of precipitates, isolated from wastewater of copper production by sodium thiosulfate and sodium sulfide, were studied. It was found that both reagents precipitate osmium and rhenium collectively from solutions at selected optimal conditions: addition of sodium thiosulfate in amounts calculated for getting its concentration in solution 2.0 g/dm³ or sodium sulfide – 3.0 g/dm³, duration of stirring – 2 h, temperature – 90°С. Recovery of osmium is 80, rhenium is 60 %. |
Key words | wastewater, precipitation, osmium, rhenium, recovery, precipitator |
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B.I. Dikhanbayev Intensive energy-saving at lead sulphide concentrates processing
Title | Intensive energy-saving at lead sulphide concentrates processing |
Authors | B.I. Dikhanbayev |
Author´s information |
Kazakh Agricultural and Technical University named after S.Sejfullin, Astana B.I. Dikhanbayev, Dr. Tech.Sci., senior lecture, otrar_kz@yahoo.com |
Summary | The new system of sulphide plumbeous concentrate processing is developed. That includes: iron reduction and zinc sublimation from excavated slags by soot hydrogenous mixture (SHM) in the reactor of phase inversion, lead ousting into crude metal from its sulphides by metallic iron in autogenous conditions of rotary mixer. Also it includes regenerative utilization of thermic wastes of system, neutralisation of SO2 – containing gases by reagents obtained aboard (ZnO, Fe) system. The implementation of new system will reduce the specific fuel consumption 3-4 times, will expand the utilization factor of material waste products 2.5-3 times in comparison with traditional system of concentrate processing. Waste of valuable components of slag (Pb, Zn, Cu, Fe) will be reduced 3 times upon the average, use of energy of sulphidic sulfur will increase 8 times, transformation of a silicate part into a useful product – 6,7 times. The charge of technological oxygen, coke fines and scarce expensive coke is liquidated. |
Key words | phase inversion reactor, zinc, lead, iron, dump slags, autogenous mode, thermal waste, soot hydrogenous mixture |
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Lokhova N.G., Naimanbayev M.A., Baltabekova Zh.A. Thermodynamic analysis of gold - arsenic concentrates basic components interaction with nitric acid solutions
Title | Thermodynamic analysis of gold – arsenic concentrates basic components interaction with nitric acid solutions |
Authors | Lokhova N.G., Naimanbayev M.A., Baltabekova Zh.A. |
Author´s information |
“Center of Earth Sciences, Metallurgy and Ore Beneficiation” JSC, Lab. of Titanium and rare refractory metals, Almaty Lokhova N.G., senior scientific worker Naimanbayev M.A., Cand Tech. Sci, Head of lab., madali_2011@inbox.ru Baltabekova Zh.A., junior scientific worker |
Summary | Analysis for interaction of main gold- arsenic concentrates components (pyrite, chalcopyrite, arsenopyrite) with nitric acid solutions was carried out by method of modeling thermodynamic chemical reactions at various temperatures using 5 HSC Chemistry Program. It was found that the chemical stability of minerals at nitric acid exposure lowers in the range pyrite > arsenopyrite > chalcopyrite. It was determined that the interaction of chalcopyrite with the nitric acid leading to formation of copper nitrate salts (II) and iron (III), sulfuric acid and nitric oxide (II) is most energetically favorable. According to the thermodynamic analysis, provided the high content of chalcopyrite in gold – arsenic concentrate pulp heating can occur due to the heat released by the chemical reaction of nitric acid with chalcopyrite. Increased temperature of the process is required to create optimal conditions for nitrate opening of pyrite and arsenopyrite. |
Key words | thermodynamic analysis, gold – arsenic concentrate, pyrite, arsenopyrite, chalcopyrite, nitric acid |
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Physical-chemical investigations
Burabayeva N.M., Volodin V.N., Trebukhov S.A., Kasymzhanova A.K.Thermodynamic properties of liquid alloys and vaporous phase in system tin-selenium
Title | Thermodynamic properties of liquid alloys and vaporous phase in system tin-selenium |
Authors | Burabayeva N.M., Volodin V.N., Trebukhov S.A., Kasymzhanova A.K. |
Author´s information |
“Center of Earth Sciences, Metallurgy and Ore Benefication” JSC, lab of vacuum processes, Almaty Burabayeva N.M. Cand Tech.Sci, scientific worker , Nuri_eno@mail.ru Volodin V.N., Dr.Tech.Sci., Dr. Phis.-Math. Sci., chief scientific worker Trebukhov S.A., Cand.Tech.Sci, Head of lab. Kasymzhanova A.K. , engineer |
Summary | The partial and integrated functions for alloys mixing and evaporation are determined on the basis of values of partial pressure of saturated vapor of the components, forming system tin-selenium, and their activity in the liquid condensed phase. Alloys formation in the quasi-binary system Sn-SnSe proceeds with heat absorption, in the system SnSe-Se process is exothermic. Alloys formation near the selenium edge of the state diagram is accompanied by some ordering of atoms – the integral and partial mixing entropy is negative. The change in free energy of mixing for tin-selenium system has alternating character: positive deviation in the concentration range 0-50 at. % of selenium and negative in the system SnSe-Se. Positive deviation of function indicates instability of liquid alloys, and the change of curvature of the line depending on the composition to the inverse in the range 1093-1273 K confirms separation region of liquid solutions. Fragmentary dependences of the free energy of mixing on the composition in SnSe-Se system at different temperatures (950-1153 K) substantially coincide and form a curve with a minimum of 11,25 ÷ 11,23 kJ/mol at 80 atm. % Se. Interval of constant values due to the influence of the separation region in the system Sn-SnSe was marked on the curve of enthalpy of tin monoselenide vaporization from composition. |
Key words | tin, selenium, vapor pressure, entropy, enthalpy, partial functions, integrated functions, Gibbs free energy, evaporation |
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Volodin V.N., Burabayeva N.M., Trebukhov S.A., Kasymzhanova A.K.Vapor pressure and thermodynamic activity of components in system lead selenide – selenium
Title | Vapor pressure and thermodynamic activity of components in system lead selenide – selenium |
Authors | Volodin V.N., Burabayeva N.M., Trebukhov S.A., Kasymzhanova A.K. |
Author´s information |
“Center of Earth Sciences, Metallurgy and Ore Benefication” JSC, lab of vacuum processes, Almaty Volodin V.N., Dr.Tech.Sci., Dr.Phis.-Math.Sci., chief scientific worker Burabayeva N.M., Cand Tech.Sci, scientific worker , nuri_eng@mail.ru Trebukhov S.A., Cand Tech.Sci, Head of lab Kasymzhanova A.K., engineer |
Summary | The pressure of saturated vapor above the liquid solutions of binary system lead selenide – selenium is determined at the study by the boiling points (isobaric option) method for the first time. Vapor pressure over liquid selenium, determined by same method for calculation of thermodynamic activity, corresponds to relationship: ln pSe [Pa] = 24,076-12029∙T-1, which practically coincides with the reference data. Lead selenide vapor pressure is determined indirectly by static method variant at temperatures of 1100-1200°. As a result of the distillation evaporation of lead selenide and condensate study by X-ray diffractometry it was indirectly found that the liquid lead selenide evaporates congruently – vapor is represented by lead selenide molecules. Vapor pressure of the liquid lead selenide corresponds to the equation: ln pPbSe ж [Pa] = 27,42-24091∙T-1, where pPbSe ж – vapor pressure of liquid lead selenide. Vapor pressure of components in binary system is presented as temperature-concentration dependences, allowing to determine the thermodynamic characteristics of the condensed and vapor phases. |
Key words | selenium, lead selenide, binary system, alloy, vapor pressure, condensed phase, solution, vapor phase |
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Kapsalyamov B.A., Kolesnikov A.S., Arinova D.B., Kapsalyamov S.A.Thermodynamic modelling of СaО formation in systems CаSO
Title | Thermodynamic modelling of СaО formation in systems CaSO4-mН2 (nCH4) |
Authors | Kapsalyamov B.A., Kolesnikov A.S., Arinova D.B., Kapsalyamov S.A. |
Author´s information |
Zhezkazgan University named after O.A. Bajkonurov, Zhezkazgan “Smelting plants production union”, Karaganda Kapsalyamov B.A., Dr.Tech.Sci., Deputy director South-Kazakhstan state university named after M.Auezov, Shymkent Kolesnikov A.S., Cand Tech.Sci, associate professor, kas164@rambler.ru Arinova D.B., undergraduate Kapsalyamov S.A., teaching master |
Summary | Thermodynamic and mathematical studies of calcium oxide (CaO) forming in systems CаSO4– mН2, CаSO4 – nСН4 from waste of phosphor industry – phosphogypsum – by combination of the methods of thermodynamic analysis and experiment mathematical modeling by method of parametric optimization using the multipurpose software complex “Astra” are presented in the article. Principal possibility of calcium oxide formation at the interaction of phosphogypsum with hydrogen and methane in the conditions of electrothermal melting was shows. Influence of temperature on the distribution of calcium (Ca) and sulfur (S) in the temperature interval 1300-1700К in the system CaSO4 – mH2 with the number of moles of H2 in the range from 0.5 up to 2.0 and in the system CаSO4 – nСН4 with the number of moles of CH4(n) from 0.128 up to 0,497 and pressure 0,1MPa was investigated. Optimal temperature ranges of calcium and sulfur distribution into condensed and the gas phase were found. The regression equations describing the process of formation of calcium oxide were obtained. |
Key words | calcium oxide, thermodynamic analysis, mathematical modeling, methane, hydrogen, phosphogypsum |
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Sagintaeva Zh.I., Toksanbaev D.O., Kasenov B.K., Kasenova S.B., Isabaeva M.A.Thermal capacity and thermodynamic functions of LаNa
Title | Thermal capacity and thermodynamic functions of LаNa3MeII3CrMnO9 (MeII – Sr, Ba) chromite-manganites in the interval 298,15-673 К |
Authors | Sagintaeva Zh.I., Toksanbaev D.O., Kasenov B.K., Kasenova S.B., Isabaeva M.A. |
Author´s information |
Chemical-metallurgical institute named after Zh. Abishev, Karaganda Sagintaeva Zh.I., Cand Сhem.Sci, leading scientific worker Kasenov B.K., Dr.Chem.Sci, professor, Head of lab, kasenov1946@mail.ru Kasenova M.A., Dr.Chem.Sci, chief scientific worker Pavlodar state university named after S.Torajgyrov, Pavlodar Toksanbaev D.O., undergraduate Isabaeva S.B., Cand Сhem.Sci., associate professor |
Summary | Chromite-manganites LaNa3Sr3CrMnO9 and LaNa3Ba3CrMnO9 were synthesized from La2O3, Cr2O3, Mn2O3, Na2CO3, SrCO3 and BaCO3 by using ceramic technology. Identity of the compounds obtained was confirmed by x-ray analysis. The temperature dependences of LaNa3MeII3CrMnO9 (MeII – Sr, Ba) chromite-manganites heat capacity were investigated by method of dynamic calorimetry in the interval 298,15-673 K. On the curves of Ср°~¦(T) dependence for LaNa3Sr3CrMnO9 at 423 K, and for LaNa3Ba3CrMnO9 at 423 and 373 K there are abnormal λ-shaped peaks, probably related to phase transitions of II-type. The equations for temperature dependences of chromite-manganites heat capacity are derived on the basis of experimental data, taking into account the temperatures of phase transitions. The standard entropies of the tested compounds were calculated by ion increments method. Values C°p(T) and thermodynamic functions Н°(Т)-Н°(298,15), S°(T) and Фхх(Т) were calculated. The received results are interesting for physicochemical modeling of similar compounds production technology. |
Key words | thermal capacity, chromite-manganites, thermodynamic functions, enthalpy, entropy |
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Materials technology
B.K. Kasenov, S.B. Kasenova, Zh.I. Sagintaeva, E.E. Kuanyshbekov, A.A. SejsenovaNew nano-structured particles of cuprate manganites NdM
Title | New nano-structured particles of cuprate manganites NdMII2 CuMnO6 (MII-Mg,Ca) and their x-ray investigation |
Authors | B.K. Kasenov, S.B. Kasenova, Zh.I. Sagintaeva, E.E. Kuanyshbekov, A.A. Sejsenova |
Author´s information |
Chemical-metallurgical institute named after Zh. Abishev, Karaganda Kasenov B.K., Dr.Chem.Sci, professor, Head of lab, kasenov1946@mail.ru Kasenova S.B., Dr.Chem.Sci, chief scientific worker Sagintaeva Zh.I., Cand Сhem.Sci, leading scientific worker Kuanyshbekov E.E., engineer Sejsenova A.A., engineer |
Summary | Cuprate-manganites with composition NdMII2CuMnO&sub6; (MII-Mg, Ca) were synthesized from oxides of neodymium, copper (II), manganese (III) and alkaline earth metals carbonates by using ceramic technology. Their nano particles are obtained by grinding them on a vibrating mill MM301 (Retsch, Germany), the size of particles is determined using an electronic microscope TESCAN (Czech Republic). It is found that the resulting cuprate-manganite nano particles are characterized by the following dimensions: NdMg2CuMnO6 – 41; 65; 64; 30; 38; 47; 44; 18; 35,048; 69; 28; 37; 30; 38; 50; 51; 66; 43; 52; 53; 43 nm; NdСа2CuMnO6 – 105; 66; 74; 146; 36; 77; 35; 26; 73; 128; 63; 58; 51; 30; 210; 64; 42; 51 nm. By indicating their x-rays picture it was found that they crystallize in the cubic crystal system with the following lattice parameters: NdMg2CuMnO6 – a= 15,502±0,034Å, V0=3725,32±0,10Å3, Z=6, V0elem.cell. = 620,89 Å3, ρrad.=5,87, ρpicn.= 5,80±0,07 g/sm³; NdCa2CuMnO6 – a=15,516±0,04Å, V0=3735,42±0,12Å3, Z=4, V0elem.cell.=935,86 Å3, ρrad.=3,81, ρpicn.=3,77±0,05 g/sm³. IR – spectroscopic study of cuprate-manganites was carried out. Research results are of interest for the development of the technology of similar compounds. |
Key words | synthesis, radiography, cuprate-manganite, nanostructure, crystal system, IR spectroscopy |
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Metallic systems investigations
A.Eh. Narivskij, G.Sh. Yar-MukhamedovaSteel AISI 321 resistance against pitting in low-mineralized chloride containing mediums depending on δ-ferrite content in it
Title | Steel AISI 321 resistance against pitting in low-mineralized chloride containing mediums depending on δ-ferrite content in it |
Authors | A.Eh. Narivskij, G.Sh. Yar-Mukhamedova |
Author´s information |
“Azov machine-building factory” JSC, Berdyansk, Ukraine Narivskij A.Eh., Cand.Tech.Sci., deputy general director on science, zaoamz@yandex.ru Kazakh national university named after al-Farabi, physics department, Almaty Yar-Mukhamedova G.Sh., Dr.Phys.-Math.Sci, professor, gulmira-alma-ata@mail.ru |
Summary | The article presents results of study of influence of δ-ferrite in steel AISI 321 at its pitting resistance in modeling circulating water used in the operation of heat-exchange equipment. It was shown that in the neutral chloride solutions critical pitting formation temperature (СРТ) for AISI 321 steel is reduced in direct proportion to an increase of δ-ferrite volume in the steel. Parabolic dependences between CPT of steel AISI 321 and δ-ferrite volume therein, indicating ambiguous effect of δ-ferrite on steel pitting resistance, were established in weakly acidic modeling circulating waters with chloride concentration of 600, 550, 500 mg/dm³, and in chloride solution with a concentration of chlorides 350, 400 mg/dm³. In highly oxidizing chloride-containing environments, which are formed on the surface of heat exchange equipment under the sediment of recycled water potentials of activation, repassivation of steel AISI 321 are shifted to negative values region, and Δφ- criterion increases with increasing the volume of δ- ferrite in it. It is most likely that δ-ferrite in highly oxidizing chloride-containing environments cathodal protects steel AISI 321 and, thus increases its pitting resistant. |
Key words | Keywords: δ-ferrite, chloride-containing environment, pit formation critical temperature, electrochemical potential, pitting resistant |
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High-resistant refractories production
Biryukova A.A., Tikhonova T.A., Boronina A.V., Mamayeva A.AApplication of ferrous metallurgy waste in heat-resistant concretes production
Title | Application of ferrous metallurgy waste in heat-resistant concretes production |
Authors | Biryukova A.A., Tikhonova T.A., Boronina A.V., Mamayeva A.A. |
Author´s information |
Center of Earth Sciences, Metallurgy and Ore Benefication” JSC, lab of physical metallurgy, Almaty Biryukova A.A., Cand Tech.Sci., leading scientific worker, biryuk.silikat@mail.ru Tikhonova T.A., scientific worker Boronina A.V., junior scientific worker Mamayeva A.A., Cand Tech.Sci., head of lab |
Summary | The results of heat-resistant concretes obtaining with application of secondary raw material – waste of ferrous metallurgy, in particular slags of high-carbon ferrochrome production are presented in the article. Heat-resistant concretes consist of the filler presented by the slag with factional composition (mm, %) : 3-1 – 40; 1-0,5 – 10; 0,5 – 0,063 – 20 and binding, containing heat-resistant cement and chemical bonding. Periclase powder, mixture of periclase powder and slag in ratio 1: 1 and slag were used as heat-resistant cement in the experiments. Solution of sodium polyphosphate with density 1,36 g/sm³ was used as chemical bonding. The refractory concretes with magnesia-silicate composition are made by method of beating with an additional compression on vibration exciter. Magnesia-silicate concretes obtained from the slags of high-carbon ferrochrome production have the operation temperature from 1300 up to 1650°С, mechanical durability at the compression after thermotreatment of samples 35-47 Н/mm². Heat-resistant magnesia-silicate concretes can be used for the liningof metallurgical, chemical, cement and other heat engineering units. |
Key words | high-carbon ferrochrome production slag, compression durability, open porosity, heat-resistance, sintering, operation temperature, density, refractory, concrete |
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