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Trofimov V.A.,Institute of Comprehensive Exploitation of Mineral Resources
Journal of Mining Science

Under consideration is the stress-strain state in the edge area of a bed when mine faces approach a vertical fracture. The author illustrates the stress-strain state analysis using the previously derived analytical solution for a single pillar situated symmetrically in a mined-out void. Comparison of the analytical and numerical results shows their admissible accuracy. © 2014 Pleiades Publishing, Ltd. Source

Bisengalieva M.R.,Institute of Comprehensive Exploitation of Mineral Resources | Mel'Chakova L.V.,Moscow State University | Ogorodova L.P.,Moscow State University | Vigasina M.F.,Moscow State University
Russian Journal of Physical Chemistry A

A thermal and thermochemical study of natural aqueous hydroxyl-containing diorthosilicate, hemimorphite Zn4[Si2O7](OH) 2 • H2O, was performed. The step character of its thermal decomposition was studied using FTIR spectroscopy. Melt solution calorimetry was used to determine the enthalpies of formation from oxides Δf H O OX (298.15 K) = -69.3 ± 9.9 kJ/mol and elements {ie1481-2} (298.15 K) = -3864.3 ± 10.2 kJ/mol. © 2010 Pleiades Publishing, Ltd. Source

Chanturiya V.A.,Institute of Comprehensive Exploitation of Mineral Resources | Minenko V.G.,Institute of Comprehensive Exploitation of Mineral Resources | Samusev A.L.,Institute of Comprehensive Exploitation of Mineral Resources | Timofeev A.S.,Institute of Comprehensive Exploitation of Mineral Resources | Ostrovskaya G.K.,Yakutniproalmaz Research and Design Institute
Obogashchenie Rud

Rocks of diamond pipes of the deposit named after M. V. Lomonosov, which is the largest primary diamonds deposit in the European part of the Russian Federation, are almost completely (up to 90 %) substituted by saponite. In water medium this mineral forms fine-dispersed jelly- like suspension, that practically may not be settled even by means of various coagulating reagents and flocculants, leading to upsets in dia- monds separation process under the conditions of water recirculation. On the basis of experimental studies of saponite settling rate mea- surement with employment of various energy effects, a high effectiveness of electrochemical method was established, essentially consisting in application of electrophoretic effect of negatively charged finely-dispersed saponite particles attachment to anode, electroosmosis with clarified water obtained on cathode. An electrochemical separator was developed and tested under full-scale conditions with a view to effec- tively de-slime saponite-containing waters with solid phase concentration up to 257 g/dm3 at OAO Severalmaz facilities. Rational parame- ters of saponite-containing waters electrochemical separation process were established, providing for saponite recovery over 80 % and clar- ified overflow with solid phase concentration within 20 g/dm3, energy consumption being 4?7 kWh per 1 m3 of feed water. A possibility for effective de-sliming of re-circulated waters at OAO Severalmaz facilities was substantiated, permitting to solve an environmental problem through efficient organization of water recirculation system and providing for diamonds separation processes stabilization, as well as com- mercial production (up 1 million tons per year) of saponite of desired product range. Source

Trubetskoy K.N.,Institute of Comprehensive Exploitation of Mineral Resources | Victorov S.D.,Institute of Comprehensive Exploitation of Mineral Resources | Zakalinsky V.M.,Institute of Comprehensive Exploitation of Mineral Resources | Kochanov A.N.,Institute of Comprehensive Exploitation of Mineral Resources | Etkin M.B.,Gidrospetsproek
Rock Fragmentation by Blasting, FRAGBLAST 10 - Proceedings of the 10th International Symposium on Rock Fragmentation by Blasting

Optical registration has been performed of dust-gas cloud development and spreading that results from the explosion of heavy-weight charges. Computer modeling was used in the assessment of cloud development. Research on microparticles settled at different distances from the explosion epicenter has been carried out. Concentration of particles, their mineralogical composition and size distribution have been estimated. Methods of optical, electronic microscopy and laser spectrometry of particle size have been used. The analysis of 0.1-10 μm particle distribution has shown their predominant concentration in the 1.0-3.0 μm range. © 2013 Taylor & Francis Group. Source

Chanturiya V.A.,Institute of Comprehensive Exploitation of Mineral Resources | Vaysberg L.A.,Institute of Comprehensive Exploitation of Mineral Resources | Kozlov A.P.,Institute of Comprehensive
Obogashchenie Rud

Promising trends in development of research studies aimed at all-round utilization and advanced high-level processing of natural and man- induced mineral raw materials in the Russian Federation are substantiated with respect to short-term period of 2014-2020, including: improvement of physical and physical-chemical methods and methodology of predicted mineralogical- technological assessment for difficult- ly-treated and nonconventional, infrequently and under-utilized mineral raw materials; development of high-performance and energy-effi- cient technologies for ore-preparation and selective disintegration of finely disseminated ores of complex material composition; increasing measure of contrast in processing characteristics of minerals on the basis of physical-chemical and energy effects application; development of new environmentally-safe processes for all-round utilization of raw materials on the combined basis of processing as such and hydromet- allurgy, as well as development of dry benefication technologies: - sorption-extraction technologies for recovery of valuable components from product solutions in processing of uranium and multi-compo- nent complex ores; - environmentally-safe combination technologies for tank and heap leaching of gold-bearing ores with application of autoclave and bio-oxidation; - combination technologies for all-round utilization of finely disseminated polymetallic and copper-nickel ores of complex material composition; - combination technologies for all-round recovery of valuable components from naturally occuring mineralized and mine waters; - technologies not needing water as dispersive medium, utilizing vibrational fluidization effect. Source

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