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Date submitted2012-09-28
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Date accepted2012-11-28
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Date published2013-04-29
Academician N.S.Kurnakov: his life and work
- Authors:
- D. E. Chirkst
The information about life time of famous chemist and metallurgist N.S.Kurnakov and the capsule review of his scientific achievementsis represented in this paper. The formation of chemical and metallurgical scientific school in Saint Petersburg Mining Institute is shown.
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Date submitted2012-09-26
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Date accepted2012-11-07
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Date published2013-04-29
The role of calcium oxide in the thermochemical conditioning of bauxite
- Authors:
- V. M. Sizyakov
- O. A. Dubovikov
- N. V. Nikolaeva
It is well known that lime is an effective additive which allows to increase the depth and speed of the extraction of alumina from bauxite by the Bayer process. The firing is one of the operations in thermochemical conditioning of bauxite, it is rational to enter directly on the lime-stone at firing of bauxite, eliminating the special operation of firing limestone and calcined material damping. In order to test this were carried out research on the firing of bauxite in the presence of calcium oxide, subsequent desiliconization of calcined bauxite and autoclave leaching bauxite concentrate.
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Date submitted2012-09-12
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Date accepted2012-11-12
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Date published2013-04-29
Regeneration of reversible alkaline solutions at chemical conditioning of bauxite
In Russia and some other countries proposed various ways to the chemical enrichment of bauxite, which usually does not affect the question of regeneration of an alkaline solution of silica, or reduce it to the release of silica in the form of calcium silicate. While the technological circuits of the chemical enrichment of the return should include an alkaline solution, after regeneration, the following parties desiliconization bauxite. It is known that the chemical enrichment is accompanied by a secondary process – the formation of hydroaluminosilicates sodium, the rate of which depends on the concentration in the alkaline solution as aluminum oxide and silicon dioxide. This paper presents data a two-stage osazhdniya silica from an alkaline solution. In the first stage in the form of sodium hydro-aluminosilicates and second in the form of calcium silicate.
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Date submitted2012-09-12
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Date accepted2012-11-07
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Date published2013-04-29
Intensification of carbon aluminates technology of superdeep desilication on the basis of the catalytic properties of the hydro granate sludge
- Authors:
- V. M. Sizyakov
- E. S. Kononenko
- A. I. Snegurova
The results of laboratory studies on super deep desilication of alumina liquors based on hidrocarboalyuminat calcium supplements 4CaO×Al2O3×0,5CO2×11H2O in advance of entering into the process of working hydrogranat sludge. Obtained qualitatively new alumina liquors with a silicon module (weight ratio Al2O3/SiO2) of 50 000 units. Impact of type-ahead hydrogranat sludge to a desilication depth given from the viewpoint of heterogeneous catalysis.
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Date submitted2012-09-24
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Date accepted2012-11-30
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Date published2013-04-29
Technology super deep desiliconization with fractional dose hydrocarboaluminate of calcium
- Authors:
- V. M. Sizyakov
- E. S. Kononenko
- S. N. Makarov
The result of industrial tests of the technology super deep desiliconization of alumina liquors with fractional dose hydrocarboaluminate of calcium 4CaO×Al2O3×0,5CO2×11H2O. Due to this technology solution alumina liquors with higher silicon module (relative weight Al2O3/SiO2) without increasing lime carbonate expenditure.
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Date submitted2012-09-25
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Date accepted2012-11-09
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Date published2013-04-29
Thermodynamic analysis of aluminium hydroxide calcination at alumina production
- Authors:
- V. M. Sizyakov
- L. A. Voropanova
The thermodynamic analysis of aluminium hydroxide dehydration during calcination process at alumina production is carried out. The calcination of aluminium hydroxide is possible at ordinary pressure and temperature value more than 600 K. Diaspor dehydration process is possible by way of freezeout of water as an ice, water rendering or heating till decomposition temperature.
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Date submitted2012-09-20
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Date accepted2012-11-14
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Date published2013-04-29
Modern questions of the metallurgical processing red mud
- Authors:
- V. A. Utkov
- V. M. Sizyakov
Are considered the advantages and disadvantages of complex processing red mud to produce alumina, iron (cast iron) and cement on the area of alumina refineries and way of getting on them only transportable red mud – for shipping and recycling of new marketable products at operating enterprises.
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Date submitted2012-09-26
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Date accepted2012-11-13
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Date published2013-04-29
Hydrochemical processing of red sludge «Aluminium of Kazakhstan» JSC
The impact of operating conditions of red sludge autoclave leaching with high-modulus alkali-aluminate solutions such as duration, temperature, limestone dosing rate, caustic alkali concentration, and pulp liquid-to-solid ratio on extraction of valuable components: alumina and alkali has been explored. The behavior of hydrogarnet sludge during thickening, washing and filtration has been checked under laboratory conditions. Researches were held and optimum parameters of solutions’ caustic module conversion have been chosen. The optimum alternative of process chart of hydrochemical branch as applied to red sludge processing at «Aluminium of Kazakhstan» JSC has been chosen.
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Date submitted2012-09-11
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Date accepted2012-11-23
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Date published2013-04-29
The role of mineralized additivies in the alumina phase transformation process
The statistical analysis has allowed to reveal the additives essentially influencing process of formation of corundum. So, fluoric connections of sodium, calcium, aluminum, oxide of iron and chrome promote formation. Opposite influence is rendered oxide of sodium, by connections of lithium and a dioxide of the titan. Besides, influence of a dioxide of the titan and oxide of chrome is estimated.
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Date submitted2012-09-04
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Date accepted2012-11-13
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Date published2013-04-29
Study of the separation process dispersed nonuniform systems for conditioning bauxite
- Authors:
- V. M. Sizyakov
- O. A. Dubovikov
- N. V. Nikolaeva
The possibility of thickening and filtration for separation of heterogeneous disperse systems formed during the chemical conditioning of bauxite was investigated. It is shown that with increasing the ratio between liquid and solid phases of bauxite pulp thickening process indicators are improving. A similar influence provides of temperature increase of the process and the use of flocculants. The obtained results are compared with the indicators of condensation of red mud. The filter cloth was chosen for slurry concentrate bauxite, which provides the most rational regime filtration with the accumulation of sediment.
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Date submitted2012-09-19
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Date accepted2012-11-26
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Date published2013-04-29
Prospects of magnesium oxide application in Bayer’s aluminous technology
The question of magnesium oxide application for purification of aluminate liquors of aluminous production is in a complex considered. The two-phasic process is offered for providing of magnesium hydrocarbo- and sulfuraluminates formation by interaction of magnesium oxide with aluminate liquors under conditions, corresponding to parameters of aluminous production. High sorption activity of received compounds is defined with reference to organic substances of aluminate liquors.
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Date submitted2012-09-21
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Date accepted2012-11-02
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Date published2013-04-29
Researches on improvement of gold leaching process by means of mass transfer optimization in gas-liquid reactors
Modern metallurgy pays more attention to chemical processes safety of staff and nature environment. One of the most hazardous branches in metallurgy is gold ores cyanidation. Researches on possibility to avoid cyanide leaching are carrying out during last thirty years. Cyanide competitors are thiosulphate and thiourea solvers. Within international cooperation between National Mineral Resources University and Lappeenranta University of Technology researches are devoted to tiosulphate leaching improvement. Main efforts are forwarded on process chemistry, however mass transfer processes of heterogenic systems are important as well. Therefore their optimization is planned to achieve by means of computer modeling based on particle image velocimetry.
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Date submitted2012-09-18
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Date accepted2012-11-19
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Date published2013-04-29
Investigation of the effect of concentrate oxidation on thiosulfate gold leaching
- Authors:
- D. V. Gradov
- V. M. Sizyakov
- M. Neuvonen
More and more attention is paying to research of feasible cyanide alternative leaching techniques due to increasingly growing concern to Mother Nature. After some serious cyanide accidents some countries have campaigned to ban cyanide in gold mining industry. Political alignments and concern about environmental have been reasons to find good and less-toxic alternatives to cyanide. One of the most promising leach reagents is stated to be thiosulphate because of its benign properties. Moreover it is suitable for sulphide and carbonaceous ores which present a problem for cyanidation. In the present paper number of experiments on research of thiosulphate leaching kinetic study as well as pretreatment of gold concentrate by wet oxidation with following leaching tests is presented.
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Date submitted2012-09-28
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Date accepted2012-11-01
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Date published2013-04-29
Selective activity of some sorbents of organic compounds in aluminate liquors
- Authors:
- E. V. Tikhonova
- E. V. Sizyakova
Sharp selectivity of hydrocarboaluminates of caustic-earth metals and magnesium oxide in relation to the most dangerous classes of the organic substances playing defining role in decrease in extent of decomposition level and deterioration of produced alumina properties– humic, carboxylic acids and high-molecular organic compounds are defined. Soda is good for humic acids sorption (about 40 %) also is inefficient for removal of carboxylic acids and high-molecular compounds. Harmful groups of organic substances generally provide chromaticity of aluminate liquors. The photometric analysis states an objective assessment of the content of the painted organic substances in relation to their initial quantity in aluminates liquors.
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Date submitted2012-09-23
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Date accepted2012-11-09
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Date published2013-04-29
Investigation of the colored organic compounds behavior in aluminate liquors during electrolysis treatment
- Authors:
- Yu. A. Zaitsev
- E. V. Tikhonova
- E. V. Sizyakova
The behavior of impurities – colored organic compounds (COC) in aluminate liquors of Bayer process during electrolysis treatment was investigated. Experimental data for the impact of various technological parameters and conditions are found to reduce the content of COC to 50-80 %.
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Date submitted2012-09-03
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Date accepted2012-11-08
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Date published2013-04-29
Application of high-level calcium carbonate for synthesis products in the system NA2O–AL2O3–CAO–CO2–H2O
The results of synthesis hydrocarboalyuminates of calcium (GKAK) using carbonate reagents of different nature and size distribution. A high activity of the lime sludge from causticising soda and food processing conversion of phosphogypsum, which allows us to recommend them for use in the process of obtaining GKAK. Installed limiting stage of interaction of internal diffusion of the reactants.
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Date submitted2012-09-05
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Date accepted2012-11-15
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Date published2013-04-29
About directions of stabilization grain size metallurgical alumina
The materials physical and chemical analysis of the reasons of instability particle size distribution of productional of aluminum hydroxide in the processing of bauxite by Bayer process. Shown that the frequency of changes in the properties precipitate Al(OH)3, formed during the precipitation of aluminate solutions determined by the dependence of the growth processes on the relative supersaturation of the system per unit area of the seed. Found determines the influence of concentration injected seed aluminum hydroxide and its active surface (which varies under the influence of impurities in the aluminate solution) on the parameters of the periodic changes in the properties of sediment.
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Date submitted2012-09-15
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Date accepted2012-11-20
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Date published2013-04-29
Thermodynamic of lanthanum (iii) and samarium (iii) extraction by using stoichiometric concentration solutions of naphtenic acid
Experimental data on solvent extraction of lanthanum (III) and samarium (III) by solutions of naphthenic acid from nitrate medium was obtained. Dependences of distribution coefficient of pH, concentration of organic and aqueous phase was obtained. thermodynamic characteristics of extraction equilibrium was calculated.
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Date submitted2012-09-30
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Date accepted2012-11-24
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Date published2013-04-29
Thermodynamic of cerium (III) and europium (III) extraction by using stoichiometric concentration solutions of naphtenic acid
Experimental data on solvent extraction of lanthanum (III) and samarium (III) by solutions of naphthenic acid from nitrate medium was obtained. Dependences of distribution coefficient of pH, concentration of organic and aqueous phase was obtained. thermodynamic characteristics of extraction equilibrium was calculated.
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Date submitted2012-09-13
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Date accepted2012-11-02
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Date published2013-04-29
Extraction of cerium lanthanides by using stoichiometric concentration solution of naphtenic acid
Technology of solvent extraction and separation of cerium lanthanides by solutions of naphthenic acid in o-dimethylbenzene was obtained. The sequence of extraction Eu > Sm > Ce > La from nitrate media was calculated.
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Date submitted2012-09-06
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Date accepted2012-11-25
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Date published2013-04-29
Briquetting of iron-ore materials for iron and steel industry
- Authors:
- V. B. Kuskov
- A. V. Kornev
- D. V. Sukhomlinov
Briquetting in ferrous metallurgy is the earliest way clotting. In the beginning of XX century briquetting has been forced out by agglomeration basically for the reason considerably more productivity of process of agglomeration. The alternative agglomeration became pelletizing which share from the XX-th century middle steadily grows that is quite explainable essential increase in manufacture fine particle concentrates. However briquetting has a number of advan- tages. And for separate kinds of iron ores briquetting can appear preferable process. Such ores are the rich iron ores containing 60 and more % iron in ore. The technology of briquetting includes, preliminary screening for removing of large classes; dispensing and preliminary mixing 85-90 % martite, iron-micaceousmartite ores and 10-15 % hydrohematite ores; mixing with connective substances; pressing; drying. The received briquettes have density 3200-3500 kg/m3, durability on compression about 4,5 MPа.
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Date submitted2012-09-20
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Date accepted2012-11-28
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Date published2013-04-29
Complex use of iron ores in iron and steel industry
- Authors:
- V. B. Kuskova
- Ya. V. Kuskova
The most common inorganic pigment is red iron oxide. Production of red iron pigment from Yakovlevskogo ore deposit is promising and will meet the demand for high quality and in-expensive pigment. Designed wasteless flowsheet for separation of iron ore in two qualities – paint grade quality (pigment) and metallurgical grade. The technology includes crushing, fine grinding ore in a ball mill and classification. The metallurgical grade of ore is used for metallurgical manufactures of briquettes.
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Date submitted2012-09-23
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Date accepted2012-11-06
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Date published2013-04-29
New technologies of fine and ultrafine minerals comminution
- Authors:
- V. V. Lvov
This article describes a new advanced technology IsaMill™ (Xstrata Technology, Australia). An innovative, large-scale, energy-saving technology comminution, designed and tested on different metalliferous ores solid.
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Date submitted2012-09-22
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Date accepted2012-11-07
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Date published2013-04-29
The intensification of the separation of minerals using vibrational segregation
- Authors:
- A. O. Romashev
- V. B. Kuskov
- V. V. Lvov
The possibility of using the vibrating segregation in the intensification of separation minerals. The possibility of the use segregation in the separation coal on the concentration tables. Also shows the effective use of segregation for dry non screen classification of loose materials.
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Date submitted2012-09-12
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Date accepted2012-11-15
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Date published2013-04-29
Use of new kinds of disk concentration tables for increase of efficiency of gravity concentration
- Authors:
- V. B. Kuskov
- Ya. V. Kuskova
One of the most effective gravity aggregate is concentrating tables. Concentrating tables are used for tin, tungsten, rare, precious metal ores beneficiation. The new designs of rotating disk concentrating tables are developed. Comparative tests of concentrating shaking table, spiral sluice and of the basic experimental model of a rotating circular table were conducted for concentration of artificial mixtures. The using of round tables can increase recovery and efficiency of separation оf dense particles.
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