Mineral Processing
Chizhevskii V.B., Orehova N.N., Fadeeva N.V. The influence of sodium tripoliphosphate on physical-chemical properties of sphalerite surface and its flotation ability
The possibility of the depressing action of sodium tripoliphosphate at sphalerite flotation has been shown from the positions of complex formation. The results of the study of the adsorption of polyphosphate on mineral surface as well as the results of the study of sorption by collector sphalerite - butyl potassium xanthate at the presence of sodium tripoliphosphate in neutral and alkaline mediums have been presented. The assumption about combined chemical and physical adsorption of the products of the reaction of sodium tripoliphosphate with zinc ions has been considered on the base of experimental data about of the change of the characteristics of double electric layer.
Extractive Metallurgy of Heavy Nonferrous Metals
Katkov O.M. The silicon melting from briquette mixture in arc electric furnaces
Chemical composition of slag - technical silicon impurity melted in arc electric furnaces of various power has been presented. The reasons for its formation have been shown - quartzite incompletely reduction due to infringement of optimal regime of the melt, irregularity of the mixture loading and composition, non-optimal temperature regime of the melting. The recommendations on the decrease of slag content in silicon have been given.
Extractive metallurgy of less-common metals
Barybin A.V., Vasin В.D., Ivanov V.A., Raspopin S.P., Schetinsky A.V. Clorinatrion of rare-earth metal oxides and carbonates and monazite by chlorinated carbon
The interactions of samarium, europium, neodymium carbonate and monazite with carbon tetrachloride have been investigated. The temperature influence on kinetic parameters has been studied and activation energies of processes have been estimated. The conditions, which allow to organize “dry” chloration process with technologically acceptable rates and with achievement of rather high degree transfer of components into chlorinates have been determined. For monazite chloration example, it has been established, that the choice of chlorinated carbon as a chlorinahon agent allows to decrease temperature (on 300 ° C) and to intensify the opening-up process (the chlorination rate increases more than one order) as compared with traditionally rare metal raw material processing by chlorine in carbon containing materials presence.
Gron V.A., Strizhko V.S., Mikhnev A.D., Drozdova N.A., Redkin S.A. The choice of selective sorbent for the gallium extraction from alkaline solutions
It has been revealed from the investigations that nitrogen-phosphorus containing sorbents are the most perspective for the gallium extraction from alkaline solutions. Sorbent with high capacity parameters for gallium has been produced as a result of synthesis.
Zubareva G.I. Separate extraction of manganese and vanadium compounds from acid technological solutions
The technological scheme of separate extraction of manganese (II) and vanadium compounds (vanadates) from acid technological solutions forming at the production of technical vanadium dioxide (V) from the slag of metallurgical production by hydro-metallurgical method by their treatment by the solution of potassium permanganate with the selection of total manganese mass into manganese dioxide deposit extracted from acid solutions by the filtration or flotation has been described. After the extraction of manganese from acid solutions they are feeding to hydrolythical extraction of technical vanadium dioxide. The tests has shown that previous purification of technological acid solutions from manganese was of 89-96 %, which leads to the decrease of its content in the melted ferrovanadium with the increase of the quality and cost of the latter.
Gamataeva B.Yu., Gasanaliev A.M., Aivazova M.B. Bahshieva D.M. Phase equilibriums in the system Li, Ba//F, WO4
Differential-thermal and X-ray - phase methods of analysis triple mutual system from fluorides and lithium and barium has been studied. It has been installed that in the system two eutectics and peritectics with temperatures of melting E1 = 616 ° C, Е2 = 744 ° C and P = 815 ° C are realized. The phase diagram of condition is presented by the fields of crystallization of source salts and LiF · BaF2 compound, the dominant field of crystallization is characteristic of to barium tungstate.
Extractive metallurgy of precious metals
Greiver T.N., Tihonov O.N., Petrov G.V. Chromite ores containing platinum - perspective mineral source of platinum metals
In the work technological properties chromite ores of Ural and Siberia deposits have been investigated. The laws and features of the behaviour platinum metals and chrome at mechanical enrichment of chromites of various types have been established. Methods of allocation of rich concentrates platinum metals from chromite ores by receptions of the mechanical enrichment have been developed. It has been revealed, that chromite ores contain a significant part of platinum metals, not separated by the methods of mechanical enrichment. It has been shown high perspective way of the precipitation of platinum metals at the processing of chromite materia1s in chemical and metal1urgical manufacture at minimal expenses in frames of existing technologies even at the low contents of platinum metals.
Casting Production
Kondratenko T.T., Kluev F.V., Gerasimov S.P. New strontium master alloys
The deriving master alloys Al-(1-5)%Sr and Al-12%Si-(1-5)%Sr by alumothermal reducing of strontium from its carbonate has been mastered. The high modifying ability of master alloys for hypoeutectic alloy Al-Si has been shown.
Batyshev A.I., Litvinova N.N., Stanchek L., Savchenko E.G. The peculiarities of the formation of the castings of glass type at the casting with the crystallization under the pressure
The solidification and cooling of the castings of glass type with the wall thickness of 5-20 mm from the silumins containing up to 18 % Si at the casting with the crystallization under the pressure (with the usage of the scheme of plunger pressing) has been investigated. The data about the durability and factor of the solidification of the castings and the structure and properties of the latter have been given.
Metal Forming
Parfenov D.Yu., Mochalov N.A., Galkin A.M., Sorochkin V.V. Rheological properties of ЛМцСКА alloy
The results of the works on the plastometric investigations of complex alloyed alloy on the base of copper ЛМцСКА applying to the processes of hot deformation have been presented. The dependencies of tensile strength and maximal plasticity of the given alloy in temperature interval T = 600-800 ° C at the strain rates V= 0,1-10,0 s- 1 have been shown. The analysis of the curves of yield and maximal plasticity has been given. The recommendations on temperature-rate parameters of the ЛМцСКА alloy deformation have been proposed.
Ziselman V.L., Piksaev S.N. The investigation of the mechanical properties and the description of the production of stripes from titanium-zinc alloy
The problems connected with the usage (for building construction and reconstruction) of new roof material named titanium-zinc have been considered. The results of the investigations of mechanical properties at room and negative temperature have been given. The influence of the annealing temperature on mechanical properties of titanium-zinc stripe has been studied. The description of technological scheme of the stripe production acting now at Moscow plant of nonferrous metals treatment has been given.
Physical Metallurgy and Heat Treatment
Aksenov A.A., Filipov A.T., Zolotorevskii V.S. The forming of the structure of disperse hardened composite materials “aluminium-silicon carbide” during the process of mechanical alloying
The structure of composite materials Al-4 % Cu-1,5 % Mg-20 % SiC and Al-6 % Zn-1,5 % Mg-1 % Cu-(5-20) % SiC produced by the method of mechanical alloying in planetary mill with quasi-cylindrical milling bodies has been studied by the methods of light and scanning electronic microscopy, electron probe microanalysis and X-ray structure analysis. As a result the granules of composite material with the structure consisting of the matrix - aluminium solid solution and silicon carbide particles distributed uniformly over the matrix have been produced. It has been shown that for the case of the usage of planetary mill all structure changes necessary for the production of quality material proceed ten times faster than it for attritors. Principal possibility of the usage for the production of composite materials of large matrix particles including the waste products of mechanical treatment of aluminium and its alloys has been shown.
Powder Materials and Coatings
Ermilov A.G., Rupasov S.I., Safonov V.V. The investigation of the possibility of synthesis of carbonyl of tungsten powder in spouted bed
The influence of the mechanical activation of tungsten powder in spouted bed on the velocity of its synthesis of carbonyl has been considered. The assumption about that the main product of parallel (secondary) reactions at the synthesis of tungsten hexacarbonyl is W2Ccub has been confirmed. Previous heat treatment in argon of tungsten powder having lost reactability at the temperatures above the temperature of phase transition W2Ccub ® W2Chex allows to increase the velocity of synthesis of carbonyl in an order.
Shtаnskii D.V., Levashov E.A., Sheveiko A.N., Moore J.J. The composition, structure and the properties of Ti-Si-C-N-coatings deposited under SHS-targets sputtering
This study represents one of the first attempts to deposit multicomponent thin films (more than three components) by magnetron sputtering of multiphase composite targets (three phases or even more). Films of Ti-Si-C-N were synthesized through d.c. magnetron sputtering of xTiC + yTi3SiC2 + zA composite targets (A was TiSi2, SiC or a mixture of these phases) in an argon atmosphere or in a gaseous mixture of argon and nitrogen. The as-deposited films were characterized with Auger electron spectroscopy. X-ray diffraction, transmission electron microscopy using selected area electron diffraction and high- resolution techniques, and their microhardness. It was shown that the substrate temperature and the nitrogen concentration in the reactive gas had a strong influence on the structure and the composition of the as-deposited films. The films deposited from the Si-poor targets were either polycrystalline or contained a mixture of nanocrystalline and amorphous phases. An amorphous phase formed as individual grains rather than as intergranular amorphous layers. All films deposited from the Si-rich target were amorphous in their nature. Particular attention has been paid to the atomic structure of grains and grain boundaries in the crystalline films. The contribution of stress in the increasing of the lattice parameter has been also discussed.
Corrosion and metal protection
Muravjova I.V., Andreev Yu.Ya. The determination of the tendency to selective corrosion for aluminium and tin bronzes
Anodic behaviour of heterogeneous Cu-Al and Cu-Sn alloys in 0,4 М NaC1+0,6 М NaOH (pH = 12,4) solution has been investigated as a function of aluminium and tin contents by potentiodynamic polarisation, chronopotentiometry and atomic absorption spectroscopy. The kinetics selective dissolution alloys is establish to define by speed diffusion of atoms of aluminium and tin in a surface layer of alloy with diffusivity of 10- 12-10- 13 cm2/s and 10- 11-10- 13 cm2/s respectively. The de-alloying rate is proportional to the contents of aluminium or tin components in an alloy and higher for Cu-Sn solid solutions.
Technology of semiconductor materials
Dashevskii M.Ya., Kibizov R.V., Titunin D.P. The properties of silicon monocrystals doped by boron with the given twinned structure after low temperature treatment
The investigation of physical properties and strucrtural peculiarities of silicon monocrystals with planes and boundaries of twinning has been carried out. The influence of low temperature heat treatments on the physical properties of silicon monocrystals with required twinned structure has been studied. The anisotropy of the etching of structure defects on polar planes {112} and {114} has been revealed.
Metallurgical heat engineering and environment protection
Davidson A.M., Rutkovskii A.L. To the problem of the calculation of heat exchange in tube rotary furnaces
The methods of the calculation of heat exchange in work space of tube rotary furnaces by the method of effective heat fluxes and resolvent zone method has been considered. It has been established on the example of the furnace of alumina calcination by the comparing of the data for the work of industrial furnace and the results of the calculation that it is necessary to take into account for the providing of accuracy at the calculations on the method of effective heat fluxes at the determination of effective heat flux from convective heat transfer to the fettle, the flux of heat losses into environment and heat flux of heat exchange between closed surfaces of fettle and material. In this case heat flux of heat exchange between closed surfaces of fettle and material influences significantly on the resulting heat flux picked up by the material. The usage of the obtained results allows to increase significantly the accuracy of the calculations of heat exchange of rotary furnaces.
Process Control and Automation
Vasiljev R.R., Hatiushina L.V. To the question about optimal control of transport service of converter group (new class of queuing systems)
Class of queuing systems which has not been studied earlier, differing from traditional schemes is being considered. The examples of the given queuing systems in metallurgical industry and in everyday life have been given. Non rational work of considered queuing systems is caused by the obstacles from the working service devices. The classification of the given system has been presented, the tasks of control have been formulated. The possibilities of the appearing obstacles in the service have been calculated by classic method and by the presentation of requisitions as a sequence of impulses. The considered examples are the simplest and illustration. Analytical expression of the possibility has been obtained for these. Real problems for queuing systems with service device which prevent the work for each other can have more complicated description and will be considered in the next publications
Pogorelov V.N., Sinelnikov V.P., Stopkevich V.V., Timoshenko N.I., Halaji V.G. Optimization of the process of the production of polycrystalline silicon by the method of hydrogen reduction of trichlorsilan in close technological cycle
In the character of initial data for this work there were used the experiments which have been carried out before the investigation of the dependence of the speed of precipitation in the apparatus of hydrogen reduction upon the quantity of the surface of precipitation (the diameter of the pivots). The mathematical model of the apparatus at reduction was used for getting of the model of realisable technological proceed carrying out in the exclusive cycle. Using the methods of classical calculus of variations the optimal regimes of the supply of the raw materials in the apparatus, the comparison of the effectiveness of different programmers of the supply of the raw materials was carried out and, moreover, the methodology of distribution of the raw materials among the apparatus was worked out in dependence with the stage of the process in every apparatus and the resource of the raw materials which are in the portion.
Higher metallurgical education
Kurdjumov G.M., Bogoslovskii S.Yu. The necessity of modern scientific level for the chemical studying of the students-metallurgists
The contents of inorganic chemistry¢ course are analysed as well as those of the branches of science succeeding this course in students¢ training in metallurgy. The fact that the nature and the structure of many practically important chemical compounds in those courses are considered from obsolete positions is noted. Putting those views in conformity with modern scientific ideas is suggested.
