Change in technological properties of technogenic sulfide-contained raw material in the storage process

Results of modeling of changes in technological properties of sulfide minerals (pyrrhotite, pentlandite, and chalcopyrite) present in mining-industrial wastes stored in a climate in which evaporation prevails over precipitation are reported. It is proved that flotation activity of chalcopyrite and, in particular, of pentlandite diminishes, pyrrhotite increases, and selectivity and flotation of combined sulfides with respect to other minerals increases insignificantly. The content of water-soluble salts, dominated by nickel sulfates, increases with storage time. Institute of Problems of Complex Development of Bowels, Russian Academy of Sciences, Moscow, Russia Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 108–114, May–June, 2000.     

Theoretical basis for optimal collector concentrations and pulp pH values during flotation of sulfide-free minerals

A hypothesis that associates optimal conditions of mineral flotation with a zero charge of their surface is put forward. This hypothesis serves as a basis for a methodology to obtain and verify quantitative physical-chemical models for a minimal necessary concentration of a collector during flotation of sulfide-free minerals. These models may be of use for upgrading engineering processes of flotation and as a job for the concentration plant automation systems. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 89–99, March–April, 2006.     

Design of the flotation machines and efficiency of their use

The designs of the most known flotation machines are compared, considering their design peculiarities that influence technological and economic parameters of the machines. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp 84–93, May–June, 2008.     

Flotation kinetics equations and transfer functions for flotation machines taking account of the effect of the froth layer

Conclusions Flotation kinetics equations and transfer functions have been obtained for a two-phase flotation model. It has been demonstrated that specific flotation rate depends on concentration of minerals being floated in the froth layer. Sverdlovsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki poleznykh Iskopaemykh, No. 4, pp. 107–111, July–August, 1984.     

Strategy for the development of the Russian coal industry

The distribution of coal reserves in the Russian Federation is considered, in terms of active or reserve status, their end use, open-pit versus underground mining, and suitability for extraction. Coal production over the next twenty years is predicted, and the corresponding stages in the development of open-pit and underground mining technologies are formulated. Academy of Mining, Moscow, Russia. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 67–77, January–February, 2000.     

Theoretical aspects of modeling the elementary act of flotation

Physical relationships in the flotation process have been analyzed by modeling a flotation complex consisting of one bubble and one particle. The influence of inertial force on stability have been evaluated, with various bubble dimensions and various values of the surface tension at the liquid-gas boundary. State Technical University, Irkutsk, Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 92–95, January–February, 1999.     

Creation of the efficient flotation agents on the basis of new raw materials and chemical industry waste

It is reported on creation, implementation, and mechanism of action of flotation agents that are developed by the Russian scientists and are brought into industrial use for mineral dressing. The data are cited about the new collecting agents and the subsidiary agents that improve the existing technological schemes. The new efficient flotation agents, which are created on the basis of chemical and petrochemical industrial waste, are presented. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 75–88, July–August, 2006.     

On regularities observed in formation of liquid phase composition in flotation sulfide pulp

It is shown that modifiers decrease oxidation of pyrite following the line: cyanide > thiosulphate > sulfite > sulfide > dioxide. Action of the modifiers shows itself weaker for other sulfide minerals. The mode of selective flotation of cooper-zinc, copper-pyritic and other products has been developed with allowance for this fact. Iron powder and ferrous iron, as fine reducing agents, advantage to saving the natural surface of a sulfide mineral and improving the flotation selectivity. Decrease in the concentration of copper in liquid phase, that activates sphalerite, and stabilization of anionic composition depend on the mode of pulp conditioning by grinding and flotation, based on the use of various modifiers, their feeding points and pH of the medium. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 108–119, January–February, 2007.     

Physically absorbable reagents-collectors in elementary flotation

Based on the reviewed researches held at the Institute of Mining, Siberian Branch, Russian Academy of Sciences, the effect of physically absorbable reagents-collectors on formation of a flotation complex and its stability in turbulent pulp flows in flotation machines of basic types is considered. The basic requirements for physically absorbable reagents-collectors at different flotation stages are established. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 86–95, September–October, 2007.     

Response of rough and acute surfaces of pyrite with 3-D approach to the flotation

This study presents a new 3-D approach to determine the morphological properties of pyrite particles by Brunauer — Emmett — Teller (BET) nitrogen gas adsorption and Permaran methods. The obtained parameters, which are surface roughness and acuteness, were correlated with the floatability of those mineral particles. The flotation performances of the pyrite particles ground in different mills were also evaluated by a Hallimond tube. The results showed that lower roughness and acuteness values caused higher flotation recoveries for the pyrite particles considered. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 95–104, July–August, 2006     

Scientific grounds for high-performance agent modes in platiniferous sulfide mineral flotation from rebellious ores

The author substantiates the choice of new selective agents PTTC, HPEDETC, and Hostaflot M-91 to float platiniferous sulfide minerals from rebellious ores. The study agent modes imply the use of PTTC, being a component of modified xanthate and providing 6–7% increase in recovery of copper, nickel, and PGM in flotation of the low-sulfide platiniferous copper-nickel ore from the Fedorovo-Pansky deposit. The substitution of HPEDETC and Hostaflot M-91 for xanthate makes it possible to increase recovery of platinum by 5.7–13%, palladium by 4–9% and 2–4 times the noble metal content in the flotation concentrate.     

Physically sorbed collectors in froth flotation and their activity. Part II

The mechanism of the physically sorbed collector in froth flotation is under discussion in the paper. It is shown that the basic characteristics of the collecting capacity of a physically sorbed flotation agent are its solubility, surface pressure in the film of the agent at “gas-liquid” interface, and viscosity. Experimental data and practical evidence described in the paper fortify the proposed mechanism of the collecting agent under consideration. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 85–95, March–April, 2009.     

Performance potential of the coal strip mining in the east of Russia

The potentialities of the leading mining districts in Russia to improve coal production by strip mining are analyzed. The operational issues of the Erunakovskiy (Kuzbass), Kansko-Achinskiy and South Yakutia territorial production complexes are considered. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 98–105, July–August, 2007.     

Experimental-analytical methods of the investigating the effect of complexing reagents on platinum flotation

The paper considers the studies into the hydrophobic properties of platinum and platinum arsenide, sperrylite, in the solution with added complexing reagents by using the method of measuring the force of the air bubble abstraction from the mineral surface. The effect of these complexing reagents on the chemical properties of sperrylite and pyrrhotine is analyzed. A new-developed procedure for treatment of pyrrhotine by chloroplatinic acid is presented, and the comparative flotation of natural pyrrhotine and platinum-pretreated pyrrhotine with the complexing reagents is described. The collecting properties of diisobutyl dithiophosphinate for platinum are determined, and the use of this reagent as an additional collector for platinum-group metals is confirmed in the course of the experimental flotation of platinum-bearing copper-nickel ore samples. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 68–75, May–June, 2008.     

Effect of the physical-chemical factors on flotation perfection of magnetite concentrates

The paper describes the laboratory studies aimed at comprehensive analysis and establishment of the optimal parameters for preparation of a pulp for reverse cation flotation when producing a low-silica iron ore concentrate. The kinetics of the process is investigated with application of a collecting agent and depressing agents for iron minerals. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 118–125, January–February, 2008.     

Effect of ozone on physico-chemical and flotation properties of surface of pyrrhotite under the nanosecond electromagnetic pulse treatment

It is proved by testing that the effect of nanosecond powerful electromagnetic pulses (PEMP) tends to give rise to both pyrrhotite disintegration and alterations of its particles’ surface chemistry. It is found that PEMP exerts an effect on the surface composition, floatability, sorption ability and solubilization intensity of pyrrhotite. The non-monotone variation of sulphur content, removed from pyrrhotite surface under hexane action, and ferrous and ferric sulfates detected in the aqueous phase of suspension, are found to induce a nonmonotone alteration of sorption and flotation properties of the mineral depending on the number of pulses. The mode has been established for the preliminary PEMP treatment for pyrrhotite and pentlandite, aimed at improving the flotation separation as compared to a conventional mode. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 91–99, January–February, 2007.     

Influence of Main Flotation Parameters on Detachment of Hydrophilic Particle from Bubble

The influence exerted by free to move wetted perimeter between three aggregative states and by basic parameters of foam flotation on the size of hydrophilic particles extracted by this method is numerically estimated. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 94–101, July–August, 2005.     

Non-traditional high-energy processes for disintegration and exposure of finely disseminated mineral complexes

For the first time the modern non-traditional processes for treatment of rebellious noble metal-bearing mineral ore, aimed at improving disintegration efficiency for finely dispersed mineral complexes are analyzed. Advantages and perspectives of a new high-efficient, energy-saving and ecologically safe process of the nanosecond powerful electromagnetic impulse (PEMI) effect, are proved. The said process provides a stable increase in the valuable component recovery at lower energy consumption and production costs of the finite product at the stage of dressing rebellious gold-bearing ores and concentrated products. The possible mechanisms of mineral disintegration under PEMI effect are considered, experimental data, cited in the paper, prove high efficiency of the preliminary impulse treatment, thus, the increase in the gold recovery at the cyanidation stage amounted to 4–12 % from rebellious ores, 10–30 % from gravity concentrates, 5–45 % from flotation concentrates, 30–80 % from oil flotation tailings. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 107–128, May–June, 2007.     

Physically sorbed collectors in froth flotation and their activity. Part I

It is demonstrated that the basic factor, identifying the capability to form a flotation complex, is the availability of a reagent sorbed physically on a particle surface and promoting the thinning-down of water interlayer between a mineral particle and a bubble at final stages of their approach. The numerical evaluation of the effect of physically sorbed collector on variations in the velocity of water discharge from an interlayer, partitioning a mineral particle and a gas bubble at the moment of their meeting is given. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 118–125, November–December, 2008.     

Investigation into the Gas-Dynamic State of a Coal Seam under Degassing and Moistening

The Statistics is cited for the violation of gas and dust conditions in mines of Russia and the material damage caused by gas and dust explosions. It is shown that degassing and moistening of a seam is the most efficiently conducted by the hydraulic pulse action. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 86–96, March–April, 2005.