Methods of selection of selective collectors are analyzed. The procedure of calculation of characteristics of absolute rigidity, absolute electronegativity, and reaction ability of compounds is presented. The correspondence between the results of theoretical calculations of the reaction ability of sulfhydril collectors and experimental results of adsorption and flotation of monomineral fractions of chalcopyrite, galenite, and pyrite by sulfhydril collectors is revealed. The prediction of the collecting activity based on calculations is complicated by the features of the chemical composition of natural sulfides and defectiveness of the surface associated with the genesis of ore minerals in the deposit is revealed. Dithiophosphates and thionocarbamates are isolated as main components of selective compositions of collectors for flotation of pyrite ores of nonferrous metals based on theoretical and experimental investigations. It is shown by the complex of adsorption investigations in conditions of nonfrothing flotation and analysis of the IR frustrated total internal reflection (FTIR) spectra of concentrates of nonfrothing flotation that the nonoptimal ratio of components weakly active relative to pyrite leads to a considerable increase in pyrite floatability. Sorption of components of the sulfhydril collector and pyrite floatability increase with the fraction of a nonionogenic collector in the composition lower than 40–60%. The action mechanism, which determines the action selectivity of sulfhydril collectors during the flotation of sulfides, is determined.

Cementation removal of copper from solutions obtained during pressure leaching of sulfide zinc concentrates using the rotating disc method is investigated. The negative action of lignosulfonates of the process rate is shown, its kinetic parameters are determined, and assumptions on possible causes of lowering the cementation rate are expressed.

Ferrous cake of copper-nickel production – koagel or ferrogel – transforms into the lyosol state under the effect of flocculants, which is accompanied by the release of coprecipitated nonferrous metals. The effective flocculant – iron (III) chloride – is established, which can be obtained immediately from the ferrous cake upon its dissolution in hydrochloric acid. The optimal molar ratio of iron (III) in the flocculant and ferrous cake is determined. A material balance of peptization allowing for the flocculant preparation is proposed. It is shown that the use of the flocculant makes it possible to increase the extraction of nonferrous metals from the cake by 60–80 % on average during the first repulping compared with the solution of sulfuric acid and water applied according to the acting technology.

Etching of copper with hydrazine is considered. It is shown that the informative parameter of the etching end is stopping the liberation of nitrogen. The advantage of using hydrazine compared with acids is to facilitate the design of pickle baths.

The reduction of WF6 with hydrogen on the heated surface under the atmospheric pressure, temperatures of 500–600 °C, and stoichiometric ratio of components with the subsequent additional reduction of tungsten hexafluoride at t = 800 °C and condensation of formed HF is described. The method of calculation of completeness (α) of reduction of WF6 and productivity (М) of the deposition process of tungsten depending on the temperature, gas flow rate, and sizes of the reaction surface is developed based on the physicochemical mechanism of the process. The possibility to attain М = 5,1 kg/h and α = 80 % when fabricating crucibles 300 mm in diameter and 500 mm in height is shown. The additional reduction of WF6 provides the summary magnitude α > 99,9 %. The almost complete condensation of HF initially at t = +1 °C and then at t = –78 °C makes it possible to decrease its concentration in exhaust gases below the MCL.

A new approach to the calculation of main parameters of the installation for the combined continuous casting and deformation is described. The results of determining the deformation mode of metal in the deformation region when fabricating the aluminum sheet are presented. A problem of optimization of the production and constructive parameters of the mentioned installation is stated and solved, and its main parameters for the fabrication of the aluminum sheet with the cross-section of (2÷4)×1500 mm are determined.

The influence of the structure of charge bars, overheating temperatures, and isothermal holding time of Al–5 wt % Cu melts on their properties in solid and liquid states is investigated. It is revealed using the express method that the density of melts obtained from fine-crystalline charge bars (F-c charge) has reduced values compared with the melts from coarse-crystalline charge bars (C-c charge). This peculiarity is retained over the entire studied range of overheating temperatures (760–1060 °C). The influence of the structure of initial charge bars manifests itself in the second generation (after melting and crystallization from corresponding overheating temperatures): alloys fabricated from the F-c charge have the smaller dendritic parameter α-Al and increased density and electrical conductivity compared with the alloys made from the C-c charge. It is shown that the involvement of deformed aluminum and copper waste into the charge composition provides the finely dispersed structure and increased density of Al–5 wt % Cu alloys in the solid and liquid states.

Semicontinuous extrusion of the infinite length rods from preliminarily compacted and sintered powder copper is simulated. To minimize the external friction effect, hydrodynamic lubrication mode is used. The dependence of extrusion pressure on the puncheon travel at various die cone angles is presented. A procedure of construction of the grid of finite elements to solve the problems of computer modeling of semicontinuous extrusion of cylindrical samples is proposed. The mechanism of varying the porosity over the bar cross-section at various process stages is investigated. Mathematical models of semicontinuous extrusion are constructed.

The possibility of modeling the actual production process of hot bulk forging of the forged piece made of AK6 aluminum alloy is investigated using the DEFORM-3D computer program. Parameters corresponding to production conditions of this process were introduced: die heating temperature of 350 °C, billet heating temperature of 360–470 °C, die working stroke velocity of 5 mm/s, and friction factor (by Siebel) of 0,5. It is shown that computer modeling in the DEFORM-3D program allows us to analyze the actual processes of hot bulk forging of aluminum alloys and introduce recommendations on their correction.

The analysis procedure of the microstructure evolution during intense deforming is developed and approved by an example of high-speed stamping (HSS) of GTE blades made of VT9 titanium alloy based on the analytical model of dynamic recrystallization. Model coefficients were calculated by the results of the measurement of grain sizes during the preliminary experiments on high-speed upsetting of cylindrical samples made of VT9 alloy. The microstructure was investigated experimentally after HSS of the blades made of VT9 alloy using a VSM4 hammer with the motion velocity of falling parts in deformation beginning of 30 m/s. The microstructure evolution of the deformed medium is modeled analytically (by the sizes of the α phase) allowing for the variation in texture along main deformation directions with an error up to 10 %.

The results of studying the features of the strained state of porous billets at various deformation stages in the closed and open dies are presented. It is shown that the application of the open die forging (ODF) promotes an increase in the intensity level of shear deformations for all forging piece layers as compared with closed die forging (CDF). However, when implementing ODF, it is impossible to form the poreless state overall the forging piece volume with identical charge weight and degree of axial deformation as compared with CDF due to the partial extrusion of the forging piece material into the flash at the final deformation stage. This fact predetermines the necessity of correction towards increasing the billet weight for ODF.

The results of the investigation into the influence of thermomechanical treatment modes on the structure and anisotropy of mechanical properties of sheets made of the BrKh1Tsr chromium–zirconium bronze for the subsequent fabrication of current leads from them by bending. Thermomechanical treatment included quenching from 980 °C into water, cold rolling with various degrees of drafting (16 and 46 %), and age hardening at 475 °C for 3 h. Empirical dependences of ultimate strength and yield point as well as relative elongation of the sheets made of the BrKh1Tsr bronze on the degree of drafting during rolling are determined based on the results of tests for mechanical properties. It is established that the anisotropy of the rolled metal properties is insignificant and varies weakly at various treatment stages. The average grain size in the samples after various treatment varies insignificantly and constitutes 41,88–47,50 μm.

The survey of types and fabrication methods of aluminum matrix composite materials discretely reinforced with ceramic particles and nanoparticles of refractory compounds is given. It is shown that the azide technology of self-propagating high-temperature synthesis (SHS-Az), which uses sodium azide NaN3 as a solid nitriding agent, makes it possible to fabricate numerous comparatively inexpensive micropowders and nanopowders of nitrides, carbonitrides, carbides, and their compositions, which are of interest for the reinforcement and modification of aluminum alloy. Along with the mentioned target ceramic particles, the SHS-Az product contains side haloid salts (sodium and potassium chlorides and fluorides), which can play the role of fluxes with the addition of ceramic particles into the aluminum melt. The results of experiments on the introduction of the nanopowder composition into the melt of AK6M2 alloy, %: β-SiC – 48,6, α-Si3N4 – 27,0, β-Si3N4 – 5,8, Na3AlF6 – 18,6 in the composition of the compacted pseudo-master alloy with the copper powder, which evidence the modifying effect, are presented.