The results of the investigation into the possibility to utilize the sands of tailing storage formed due to the manufacturing activity of the flotation lead–zinc concentration plant are presented. The ore part (average content of Pb is 0,21 %, Zn – 0,50 %, Au – 0,17 g/t) has the recovering value in tailings, and the nonmetallic part (contains up to 65 % quartz and 20–25 % feldspar and chlorites) has the consuming value. Sulfides are utilized into commercial selective concentrates into two stages: (i) a sulfide product is recovered from them by gravitational methods using a module-type mobile installation in the burial place of tailings and (ii) the sulfide product is processed along with the currently mined ore or individually at the stationary plant of flotation technology of the acting production. A distinctive feature of the equipment for the gravitational technology is the use of screw-type separators and steeply inclined closed channels for the separation in thin-layer working zones. The novelty of the flotation technology is in the application of the jet principle of construction of concentration cascades and environmentally safe separation mode based on sodium dimethyldithiocarbamate permanganate. The possibility is shown of using the nonmetallic part of tailings in the composition of backfilling of the developed mining space as well as in the composition of asphalt concretes. The results of the investigation prove the possibility of the complete utilization of old tailings of the lead–zinc concentration plant, which corresponds to requirements of resource saving and environmental rehabilitation of territories. 

The complexing ability of phosphorus-containing collectors relative to copper (II) ions is investigated. The values of EMF for the concentration element for the ammonium dibutyl dithiophosphate–ammonium diisooctyl dithiophosphate (1 : 1) mixture are calculated. It is established that a mixture of phosphorus-containing collectors possesses the maximal affinity to copper (II) ions. Foaming properties of ammonium dibutyl dithiophosphate, ammonium diisooctyl dithiophosphate, and their mixture in the concentration range of 10–3–10–6 mol/L are determined. It is shown that the foam prepared in a solution of the mixture with the concentration of substances of 10–5 mol/L possesses the highest stability. The flotation activity of ammonium dibutyl dithiophosphate and its mixture with ammonium diisooctyl dithiophosphate is evaluated. The possibility of using the mixture for the collective flotation of the copper ore of the Nurkazgan deposit is established. 

The results of the investigation into the impregnation (saturation) of the samples of ready roasted anodes promising for aluminum electrolyzers by organic compounds are presented. A procedure of performing this process including the preliminary evacuation, sub- sequent saturation of the samples with organic compounds under the excess external pressure, and further, high-temperature pyrolysis in the lead–bismuth melt is developed. It is established that the developed modification method allows one to increase the corrosion stability of roasted anodes. 

Preparation conditions of tungsten powder by the decomposition of the scheelite concentrate in the medium of NaCl–Na2CO3, NaCl– Na2CO3–NaF, and NaCl–Na2CO3–Na3AlF6 salt melts and reduction of formed sodium tungstate with aluminum at 1123–1273 K are investigated. It is established that the powder yield is ~93 wt.%, the of tungsten is 97 %. Granulometric characteristics of powders are determined. It is shown that the specific surface of powders reaches 14,6·105 m–1. 

Base principles of selecting compositions of the charge and processing products depending on the initial ore composition and required ferronickel composition are developed. Main production parameters of smelting are the gas temperature under the roof of 1000– 1100 °C and rarefaction of 0,5–1,5 Pa. The processing technology of the oxidized nickel ore with the acquisition of 20 % ferronickel (according to ISO 6501:1988) using the dc ore-thermal furnace is substantiated. The advantage of this process is in the fabrication of metal with a high nickel content, an increase in recovery of valuable components into the alloy, and processing fine and dust-like materials. 

The object of the investigation was an autoclave cake of the refractory gold-containing flotation concentrate, which was prepared using a pilot plant. The influence of heat treatment (HT) on the chemical composition and recovery of gold was investigated for this material in a temperature range of 100–500 °C. Due to the HT, high indices of recovery of gold up to 98 % can be attained. This is attained due to deep removal during the HT of organic carbon, which passed gold during the autoclave oxidation. Arsenic is situated in a stable nontoxic form of iron arsenate, which does not undergo the variations in the content and remains in the cake, at the HT stage overall the temperature range under study. The possibility in principle to process the double-refractoriness concentrate with the help of a complex technology of autoclave oxidation and subsequent HT is shown. 

The review describes the current state and changes of the market of selenium under the influence of appearing new sectors of their application as well as the condition and prospects of the Russian market. The dynamics of world production and the prices for selenium in recent years are given. The changes in scopes of application of selenium are analyzed and prospects of growth of selenium-containing compounds are evaluated. The demand for selenium and selenium-containing compounds in medium-term and long-term prospects is evaluated. 

Main requirements to the quality of aluminum alloys of the piston group are considered. The quality of the primary and secondary AK12MMgN alloy fabricated in conditions of various Russian producers is analyzed using the data presented by enterprises interacting with RUSAL Company in questions of manufacturing this alloy. The main ways to optimize the chemical composition of the AK12MMgN alloy implemented in conditions of OAO RUSAL Novokuznetsk are considered and substantiated and it is shown that other piston alloys with the required level of operational properties can be fabricated based on the AK12MMgN alloy. It is revealed that the quality of the AK12MMgN alloy produced based on secondary materials under definite manufacturing conditions is not worse that the quality of this alloy produced based on primary materials. It is noted that when obtaining secondary piston alloys, the attention should be paid to their obligatory modification in the liquid state (for example, by phosphorus) in order to approach the microstructure and level of properties in the cast state to alloys produced based on primary aluminum. Recommendation for enterprises, which allow one to produce the AK12MMgN alloy with the required structure and chemical composition, are presented. 

Main notions on the influence of modifying physical effects (vibration, ultrasound, electromagnetic stirring, thermal-temporal treatment) on the crystallization of cast alloys are generalized. It is revealed with the help of mathematic calculations and experimental investigations that the crystallization and structure formation of cast alloys can be largely determined by the technology of treatment by physical effects during smelting and casting. Physical effects on the crystallizing melt lead to its strong turbulization and mixing, which decreases the temperature and concentration gradients in the melt, eliminates overheating of the liquid phase relative to the solidus temperature, and breaks off the dendrites, which are good crystallization seeds for the entire melt bulk. The evaluation of the dendritic growth during the crystallization showed that dividing the dendrite grains under the physical effects to the melt withstands to their coarsening. Physical effects lead to the bulk crystallization with equiaxial grains without the formation of the columnar structure. Physical modifying effects promote an increase in the quality of fabricated alloys and casts made of them with the proviso of their rational use. 

The possibility of applying the continuous pressing method using a «Konform» installation to process the aluminum-alloy chips with their feeding immediately into the installation container is investigated. Chips of the AD1 alloy were used. Before pressing, it was washed in a water–soda solution at 80–90 °C for 8–10 min under intense stirring in order to clean the surface and dried using fans. To press the round-section rods, matrices 4, 5, 6, and 8 mm in diameter were used, which provided the elongation coefficients during pressing of 6,3, 11,2, 16,0, and 25,3, respectively. It is shown that the «Konform» method can be used to produce compact semifinished products by immediate pressing the aluminum-alloy chips. The mechanical properties of hot-pressed semifinished products allow one to recommend them for using as wares of irresponsible indentation. 

The object of the study was polycrystalline copper of the M006 brand. The dislocation substructure (DSS), which is formed in copper during the destruction in creep conditions in the magnetic field of 0,35 T, is investigated by diffraction electron microscopy. The substructure of the starting state of copper is characterized by the presence of the following DSS types: chaotically distributed dislocations (56 %), cellular substructure of various degrees of perfection (36 %), net-like substructure (5 %), striated substructure (3 %), dislocation bundles (3 %), and torn subgrains (2 %). It is established that the features in the quantitative ratio of DSS types are revealed during the destruction in the magnetic field. Notably, a subgrain structure is the main DSS type near the destruction zone in copper deformed under creep conditions without the magnetic field. The imposition of the magnetic field leads to a decrease in the relative content of the subgrain structure by a factor of almost 2. It is shown that the effect of the magnetic field retards the reconstruction of the dislocation substructure under the creep of copper, which improves strength characteristics.