The models of sulfide minerals (covellite, bornite, chalcopyrite and pyrite) are developed. The molecular models of thionocarbamates containing electron-accepting (O-butyl-N-ethylcarbamothioate (BETC)) and electron-donating (O-butyl-N-benzoylcarbamothioate (BBTC)) radicals bonded to nitrogen atoms are built. The interaction reactions between thionocarbamates and sulfide minerals by bidentate bond are reviewed to form a complex such as MeSN or bidentate complex with coordinated CuSNH and retained hydrogen/nitrogen bond. The paper offers a forecast of O-butyl-N-benzoylcarbamothioate (BBTC) and O-butyl-N-ethylcarbamothioate (BETC) activity estimation (PEC) in reactions with copper minerals and pyrite and shows that it is more energy-efficient to form a complex with coordinated CuSNH.

The paper uses mathematical modeling to study the influence of molten electrolyte composition and the geometric configuration of the electrolyzer with liquid metal lead electrodes on the spatial distribution of DC and the temperature in the «crucible in crucible» type apparatus considered as a prototype of the device for reprocessing of spent nuclear fuel. It is shown that the calculated model parameters are in good agreement with the experimental data.

The article presents the results of studying the synthesis kinetics of hydrated magnesium carboaluminates and determines the key role of preceding thermal activation of a raw magnesium component and temperature in the process rate. The study covers the mechanism and conditions of co-crystallization of hydrated calcium and magnesium carboaluminates from the pre-activated natural Mg-containing raw material. It is found that the hexagonal structures of synthesized substances exhibit high regenerative ability. The paper offers a process and instrumentation diagram for synthesizing hydrated carboaluminates of alkali-earth metals in alumina production.

The fluoride cycle in the tungsten technology is based on three processes: (1) electrochemical decomposition of HF in KHF2 + HF melt at 80–100 °C with the separate evolution of gaseous fluorine and hydrogen; (2) fluorination of tungsten powder by evolved fluorine at 300–350 °C with the condensation of formed WF₆ in the liquid state at t = 2,5÷3,0 °C; (3) reduction of gaseous WF₆ by evolved hydrogen at t = 580÷600 °C. Hydrogen fluoride is condensed at +1°C after WF₆ reduction and fed for fluorine and hydrogen formation to ensure their circulation in the cycle. The optimization of the used processes suggested technological and equipment solutions for industrial production of large flat and cylindrical semi-products for deformation, as well as tubes, crucibles and other articles of various size from tungsten with a process line capacity of ~4,3 kg/h (>34 tons/year) subject to environmental compliance. In contrast with powder metallurgy methods, the described technology produces non-porous semi-products and ready articles from pure tungsten with more fine-grained structure and virtually unlimited sizes at 2,0–2,5 times lower specific energy consumption per 1 kg of product. For higher production efficiency it is recommended to ensure simultaneous operation of 4 process lines in automatic mode.

The article describes the results of HAS32-VI superalloy electrochemical processing in nitric acid solutions in galvanostatic mode. Experiments were conducted for electrochemical dissolution of HAS32-VI superalloy in galvanostatic mode using nitric acid with a concentration of 100 g/l at different values of anode current density. It is found that this leads to quantitative separation of superalloy HAS32-VI components. The anode slurry is the concentrate of refractory metals – niobium, tantalum, molybdenum and tungsten. Cobalt, rhenium and the principal amount of aluminum, chromium and nickel partially pass into electrolyte. The flow diagram of HAS32-VI superalloy processing was suggested that provides for generation and separation of the principal nickel and cobalt amount at the first stage with the formation of Ni–Co-containing metal sediment.

The study covers organoaluminum and yttrium aluminum binder application in the production of high-heat-resistant ceramic corundum molds. This technology is a promising trend in the manufacturing of ceramic shell molds for precision casting of intricate shape high-duty investment parts of titanium alloys. Foundry shop applications of silica-free binders having a number of advantages over most popular ones at the moment addresses many issues associated with thermochemical stability of ceramic molds and reduces the scope of finishing operations along with rejection rate when casting parts of reactive metals and alloys, thus providing improved quality of high-duty investment castings.

The study covers the impact of thermo-time processing and cooling rate of molten metal on the crystallization regularities, structure, properties and modifying ability of Al–Sc alloys. The Al–Sc alloys obtained by electrolysis in the KF–NaF–AlF₃–Sc₂O₃ melts at 820–850 °C were used as an initial charge for casting. It was found that changes in overheat values and casting temperatures make it possible to vary the shape, number and size of crystals in a wide range. The modifying effect of the cast and fast-quenched master alloys and alloy produced by electrolysis was tested on Al–4,5%Cu alloys. The greatest refinement of the Al–4,5%Cu–0,4%Sc alloy structure was obtained with the fast-quenched master alloy.

The study covers technical and technological features of a scheme for wire production from casting aluminum alloys designed for waveguide soldering using combined continuous non-ferrous metal die-casting. Dependencies were found that necessary and sufficient for the design of equipment structural elements and process modes ensuring conditions for a stable process of continuous molten metal feeding into the pass of the laboratory plant rotary crystallizer, metal solidification and extrusion into a die hole, the same as per Conform process. The cross section of a batcher hole for feeding molten metal into the crystallizer wheel pass was calculated. Conditions for ∅3 mm workpiece manufacturing at a laboratory continuous die-casting plant were described, with its subsequent processing to finite size by section rolling and drawing combined with intermediate annealing. A pilot batch of round and square wire made of AK12C10 and AK12C15 alloys in the amount of 3 kg was manufactured under this scheme and transferred to JSC «ISS» named after Academician M.F. Reshetnev for industrial tests in waveguide soldering.

A relatively small number of revolutionary discoveries were made in the field of metallurgy and metal physics in the last few decades, and bulk metallic glasses are one of them. The strength and hardness of bulk metallic glasses are much higher while moduli of elasticity are lower than those of crystalline alloys which results in high stored elastic strain energy. These alloys also have very good corrosion resistance. This article covers various properties of bulk metallic glasses, in particular thermal, mechanical, magnetic, electrical properties and corrosion resistance as well as applications of these alloys.