JMS, Vol. 56, No. 4, 2020
GEOMECHANICS
ASSESSMENT OF DEFORMATION OF COAL SEAM AND LONGWALL THROUGH THE IDENTIFICATION OF TOP COAL CAVING PARAMETERS
M. V. Kurlenya and V. E. Mirenkov*
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences,
Novosibirsk, 630091 Russia
*e-mail: mirenkov@misd.ru
The stress–strain behavior of piecewise-homogenous rock mass surrounding a horizontal longwall is defined by the natural stress field and by mechanical constants of rocks and coal. The developed algorithm of successive approximations for the characteristics of rock mass with a longwall integrates all known partial algorithms into a class of difficult problems. The authors propose solving inverse problems by identification of top coal caving parameters from the numerical experiment and using additional information on geomechanical behavior of coal seam ahead of face.
Rock, seam, longwall, parameter, inverse problem, ill-posedness, equation, solution
DOI: 10.1134/S1062739120046799
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ESTIMATE OF BLOCK MEDIUM STRUCTURE PARAMETERS: A MODEL CASE-STUDY OF SEISMIC SOUNDING OF. A. BRICK WALL
E. N. Sher* and A. G. Chernikov
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences,
Novosibirsk, 630091 Russia
*e-mail: ensher@gmail.com
The article presents the model study into determination of block medium structure parameters by the seismic sounding method. The modeling was performed on a fragment of a brick wall. The wall was subjected to impulsive loading, and oscillograms of vibration accelerations in certain bricks were recorded. The velocities and spectral structure of waves were determined from the experimental data. The ratio from the earlier one-dimensional experiments, which connects the velocity of a low-frequency pendulum wave, the frequency limiting the wave spectrum and the longitudinal dimension of a block, holds true on the two-dimensional model of the block medium represented by the brick wall. The research findings allow determination of sizes of characteristic blocks in rock mass by the data of seismic sounding.
Blocky rock mass, seismic wave, impulsive loading, experimental modeling, pendulum wave, wave velocity, spectrum, block size
DOI: 10.1134/S1062739120046800
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STUDY ON THE INFLUENCE OF BEDROCK THICKNESS ON DEFORMATION AND FAILURE OF OVERLYING SOIL LAYER IN THIN BEDROCK COAL SEAM MINING
G. M. Wu*, H. B. Bai**, L. Y. Wu***, and S. X. He****
School of Civil Engineering, Ludong University, Yantai, Shandong, 264025 China
State Key Laboratory for Geomechanics and Deep Underground Engineering,
China University of Mining & Technology, Xuzhou, Jiangsu, 221116 China
*e-mail: xiaowugm@163.com
**e-mail: hbbaiteacher@sina.com
***e-mail: : tb17220023b0@cumt.edu.cn
****e-mail: tb17220014b0@cumt.edu.cn
The water-blocking action of the clay Cenozoic overburden layer is an important factor that affects safety of thin bedrock coal seam mining. The change of thin bedrock thickness has an important influence on the deformation and failure of overlying soil layer. In this work, similarity simulation experiment is used and two indexes of failure height and crack density in soil layer are selected to analyze the influence of thin bedrock thickness on the deformation and failure of overlying soil layer. The experiment results show that the failure height of soil layer increases with the decrease of the bedrock thickness. The change of failure height is small when the bedrock thickness is greater than 30 m (mining thickness is 6 m), while when the bedrock thickness is less than 30 m, the failure height of soil layer increases rapidly with the decrease of the bedrock thickness. The main effect of the decrease of the thin bedrock thickness on the deformation and failure of the overlying soil layer results in the increase of shear/tensile cracks. The shear/tension crack density is 0.04 strip/m when the bedrock thickness is 70 m, while the shear/tension crack density increases to 0.14 strip/m when the bedrock thickness reduced to 20 m.
Clay overburden, similarity simulation, crack density, thin bedrock
DOI: 10.1134/S1062739120046812
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ROCK FAILURE
FRACTURE OF STRUCTURED ROCKS AND MATERIALS IN NONUNIFORM STRESS FIELDS
V. P. Efimov
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630091 Russia
e-mail: efimov-pedan@mail.ru
The article reports the experimental data on brittle rock strength from the bending tests of beams and from diametrical fracture of disk specimens with an axial hole. The author uses the nonlocal fracture approach and compares the strength from the tests with the tensile strength of rocks. It is shown that the different geometry fracture tests allow determining the structural parameter of a medium.
Brittle fracture, rocks, nonlocal fracture criterion, structural parameter
DOI: 10.1134/S1062739120046824
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NUMERICAL ANALYSIS OF NO-DARCY SEEPAGE OF HIGH-PRESSURE GAS PRODUCED BY EXPLOSION IN DEEP CLOSED GEOLOGIC BODY
Li Ping*, Wang Xin-Zheng**, She Xiao***, and Wang Wan-Peng****
Research Institute of Highway Ministry of Transport, Beijing, 100088 China
*e-mail: Lip98223@163.com
Chinese Academy of Cultural Heritage, Beijing, 100029 China
**e-mail: wxzhsm@163.com
Northwest Institute of Nuclear Technology, Xi’an, 710024 China
***e-mail: sxsx126@163.com
****e-mail: npuwwp@163.com
Based on the analysis of the effect of underground closed explosion on geological bodies, a physical model of underground seepage of closed gas explosion is obtained. The model considers the changes of porosity and permeability due to crushing, fragmentation and fracturing of the surrounding body caused in the underground closed explosion zone. The relationship between the proportional radius and porosity, laminar permeability and turbulent permeability are established, respectively, based on the experimental data. The seepage parameters of different zones are obtained accordingly. The law of the pressure field and velocity field of the gas in the geological body and the law of the migration of the explosive gas in the geological body are analyzed using adimensionless finite difference method.
Underground closed explosion, closed high-pressure gas, No-Darcy seepage, geological body, finite difference, laminar permeability, turbulent permeability
DOI: 10.1134/S1062739120046836
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MINERAL MINING TECHNOLOGY
PAÑKER SEALING–WELLBORE INTERACTION IN HYDRAULIC FRACTURING IN COAL SEAMS
S. V. Klishin* and V. I. Klishin**
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630091 Russia
*e-mail: sv.klishin@gmail.com
Institute of Coal, Federal Research Center for Coal and Coal Chemistry,
Siberian Branch, Russian Academy of Sciences, Kemerovo, 650065 Russia
**e-mail: klishinvi@icc.kemsc.ru
The process flow chart of hydraulic impact on coal and rock mass is examined. The double-sided packer design is presented for the implementation of the chart in uncased wells of large and varied diameters. The laboratory tests of axial displacement of packer seals are described. The DEM-based stress–strain analysis is performed in rock mass in the vicinity of a well subjected to pressure from packer seal. The pressures at the packer seal–well wall interface are calculated.
Undeground mining, gas drainage, hydraulic fracturing, double-sided packer, seal, sealing, well, numerical modeling, finite element method, contact problem
DOI: 10.1134/S1062739120046848
REFERENCES
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SELECTION PROCEDURE OF DRAGLINES FOR STRIPPING OPERATIONS IN SURFACE MINING
T. A. Tsymbalyuk* and V. I. Cheskidov
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences,
Novosibirsk, 630091 Russia
*e-mail: orsa_nsk@list.ru
The authors have developed a procedure for selecting models and number of draglines for overburden removal in direct dumping within the hybrid opencast/underground mining in gently dipping coal seams. The potential opencast production capacity algorithm uses the data on the available workable reserves, life of assets, and geotechnical conditions of mining. The article presents a case study of the procedure in determination of working capacity and number of draglines so that to ensure project capacity of the direct dumping system in certain geotechnical conditions of surface mining in a suite of coal seams.
Hybrid open pit/underground mining, production capacity, overburden, dragline, direct dumping, excavation, rehandling ratio, internal dump
DOI: 10.1134/S106273912004685X
REFERENCES
1. Cheskidov, V.I. and Norri, V.Ê., Stripping with Direct Dumping in Kuzbass Open Pit Mines: The Current State and Prospects, J. Min. Sci., 2016, vol. 52, no. 4, pp. 725–731.
2. Zlobina, Å.V., Pronoza, V.G., and Tyulenev, Ì.À., On the Issue of Selecting a Dragline Model for Mining Prospective Coal Deposits in Kuzbass, Vestn. KuzGTU, 2013, no. 6, pp. 41–45.
3. Cheskidov, V.I., Bobyl’sky, À.S., and Reznik, À.V., Methodological Basis for Calculating Parameters of Direct Dumping Flowsheets in Open Pit Mining of Gently Dipping Coal Beds, J. Min. Sci., 2017, vol. 53, no. 2, pp. 299–304.
4. RD-15–14–2008. Metodicheskie rekomendatsii o poryadke provedeniya ekspertizy promyshlennoi bezopasnosti kar’ernykh odnokovshovykh ekskavatorov (RD-15–14–2008. Methodical Recommendations on the Procedure for the Examination of Industrial Safety of Mining Single-Bucket Excavators).
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7. Sysoev, À.À., Zlobina, Å.V., and Sysoev, I.À., Justification of Process Parameters of Direct Dumping Zone of the Hybrid System of Gently Dipping Seam Mining at the Design Stage, Vestn. KuzGTU, 2019, no. 4, pp. 84–89.
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14. Tsymbalyuk, Ò.À. and Nemova, N.À., Ways to Improve Stability of Transportless Unsteady-Base Dumps in Terms of Mokhovsky Open Pit, Kuzbassrazrezugol Holding Co., 2019 IOP Conf. Ser.: Earth Environ. Sci. 262 012079.
15. Pronoza, V.G. and Zlobina, Å.V., Technology for Mining Two Adjacent Gently Dipping Beds in the Deposits of Central Kuzbass, Vestn. KuzGTU, 2010, no. 6, pp. 10–19.
DESIGN OF SUPPORT SYSTEMS FOR ROCKBURST-HAZARDOUS UNDERGROUND MINES IN GORNAYA SHORIA
A. I. Kopytov, A. A. Eremenko, and Yu. N. Shaposhnik*
Gorbachev Kuzbass State Technical University, Kemerovo, 650000 Russia
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Science,
Novosibirsk, 630091 Russia
*e-mail: shaposhnikyury@mail.ru
The influence of jointing on the stability of adjacent rock mass is analyzed using the coefficient of structural weakening and the joint spacing. The gravity–tectonic stress field of ore bodies in Gornaya Shoria, including the azimuth of the principal horizontal stresses is characterized. The laboratory tension tests of combinations of support systems as well as the small-scale extension tests of rock bolts made of different materials are discussed. The framework for a multi-factor digital model of safe and efficient support design for iron ore mines in Gornaya Shoria is based on the stability assessment of adjacent rock mass in terms of jointing and stress state.
Mine support, underground excavations, adjacent rock mass, stability, jointing, ultimate strength, stress state, rockburst hazard rating
DOI: 10.1134/S1062739120046861
REFERENCES
1. Orlov, V.P., Aleshin, B.M., Alikberov, V.M., et al., Zhelezorudnaya baza Rossii (Iron Ore Resources and Reserves in Russia), Moscow: Geoinformark, 2007.
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4. Eremenko V. A., Natural and Manmade Factors of Rockbursting in Iron Ore Mining in West Siberia, Mining Informational and Analytical Bulletin, 2012, vol. 11, pp. 50–59.
5. Nazarov, L.A., Nazarova, L.A., Panov, A.V., and Miroshnichenko, N.A., Evolution of Stress–Strain Behavior in Rock Mass in Tashtagol Iron-Ore Mining by 3D Modeling Results, Proc. Conf. InterExpo GeoSibir, 2016, vol. 2, no. 2, pp. 87–91.
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7. Kopytov, A.I., Lebedev, A.A., and Utrobin, B.A., Efficient Mine Support Technology for Rockburst-Hazardous Conditions, Vestn. KuzGTU, 2017, no. 5, pp. 10–15.
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11. Shabarov, A.N., Filinkov A. A., Zubkov, V.V., et al., Rukovodstvo po bezopasnomu vedeniyu gornykh rabot na rudnykh, nerudnykh mestorozhdeniyakh, ob’ektakh stroitel’stva podzemnykh sooruzhenii, sklonnykh i opasnykh po gornym udaram (Manual on Safe Ore and Nonmetallic Mineral Mining and Underground Construction under Conditions of Rockburst Hazard), Saint-Petersburg: SPGU, 2011.
12. Shaposhnik, Yu.N., Neverov, A.A., Neverov, S.A., Konurin, A.I., and Shokarev, D.A., Development of Technology for Filling Voids between Metal Frame Support and Adjacent Rock Mass by Foam Materials, Journal of Mining Science, 2018, vol. 54, no. 2, pp. 237–247.
13. Louchnikov, V.N., Eremenko, V.A., Sandy, M.P., and Bucher, R., Underground Excavation Support in Deformable and Rockburst-Hazardous Rock Mass Conditions, Gornyi Zhurnal, 2014, no. 4, pp. 37–44.
14. Krupnik, L.A., Shaposhnik, Yu.N., Shokarev, D.A., Shaposhnik, S.N., and Konurin, A.I., Improvement of Support Technology in Artemevsk Mine of Vostoktsvetmet, Journal of Mining Science, 2017, vol. 53, no. 6, pp. 1096–1102.
15. Alymenko, D.N., Solov’ev, V.A., Aptukov, V.N., and Kotlyar, E.K., Systems of Support for Junctions in Mine Shafts and Roadways in Salt Rocks, Journal of Mining Science, 2018, vol. 54, no. 1, pp. 40–47.
16. Louchnikov, V.N., Eremenko, V.A., Sandy, M.P., and Kosyreva, M.A., Support Design for Mines Exposed to Rockburts Hazard, Journal of Mining Science, 2017, vol. 53, no. 3, pp. 504–512.
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25. Zubkov, A.A., Latkin, V.V., Neugomonov, S.S., and Vokov, P.V., Promising Methods of Underground Mine Support, Mining Informational and Analytical Bulletin, Selected Articles. Special Issue, 2014, no. 10, pp. 106–117.
26. Kopytov, A.I., Klyukin, G.K., Morozov, S.S., and Tripus, T.E., EvrazrudaKrep Application Software for Rock Stability Assessment and Efficient Support Design in Underground Iron Ore Mines of Evrazruda, Vestn. KuzGTU, 2012, no. 6, pp. 52–53.
JUSTIFICATION OF BOTTOM-UP CUT-AND-DRY FILL APPROACH TO MINING GOLD RESERVES UNDER OPEN PIT BOTTOM
S. A. Neverov, A. A. Neverov, S. A. Shchukin, Yu. N. Shaposhnik*, and A. N. Nikol’sky
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Science,
Novosibirsk, 630091 Russia 91 Russia
*e-mail: shaposhnikyury@mail.ru
The geomechanical conditions of underground gold ore mining in thin and steeply dipping ore body under open pit bottom are assessed using the dedicated 3D parameter-oriented model of mine design. The numerical model has produced the forecast stress pattern maps of ore and rock mass disturbed by mining operations. Stability justification is implemented for a sill pillar at a depth of 140 m in case of active stoping two levels above and below the pillar. Safe parameters and conditions are determined for the cut-and-dry fill mining operations.
Rock mass, rock mass quality, mine design, numerical modeling, mining system, stress–strain behavior, stability, parameters, safety
DOI: 10.1134/S1062739120046873
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ULTIMATE PIT LIMIT OPTIMIZATION METHODS IN OPEN PIT MINES: A REVIEW
A. D. Mwangi, Zh. Jianhua, H. Gang*, R. M. Kasomo, and M. M. Innocent
School of Resources and Environmental Engineering, Wuhan University of Technology,
Wuhan, Hubei, 430070 China
Mining, Materials and Petroleum Engineering Department,
Jomo Kenyatta University of Agriculture and Technology, Nairobi, 62000–00200 Kenya
*e-mail: huanggang2016@whut.edu.cn
Ultimate pit limit optimization plays a major role in the mining industry as it serves as the elementary foundation of all the activities in mine planning. This paper reviews and documents some methods used in ultimate pit limit optimization and gives a clear insight of these algorithms, their functionalities and limitations to open up more research opportunities. The algorithms reviewed are classified as rigorous or heuristic. The Lerchs–Grossman algorithm was found to have wider software application as compared to other algorithms. Genetic algorithm, artificial neural network, pseudoflow and stochastic approach also give great insights to focus in the future.
Lerchs–Grossman algorithm, mine optimization software, ultimate pit limit, rigorous and heuristic
DOI: 10.1134/S1062739120046885
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STUDY ON NEW TYPE OF ROADWAY SIDE SUPPORT TECHNOLOGY IN COAL MINES
D. Guo, N. Wang*, L. Fan, Zh. Lu, Y. Zhang, and K. Li
China University of Mining & Technology, Beijing, China
*e-mail: dmguocumtb@126.com
In order to solve the problems of coal pillar loss and relieve the tension of mining replacement in the coalface of a coal mine, this study proposes an adaptive method of retaining roadway along gob with supporting body (pier column) near loading roadway. The supporting technology of pier column retaining roadway along gob is studied through theoretical analysis and numerical simulation. The results show that the roof activity of roadway along gob can be divided into three distinct stages, namely, the stage influenced by primary mining, the stability stage of roadway retention, and the stage influenced by secondary mining. By establishing a roof mechanics model, equations are derived for calculating roof cutting resistance in three stages of gob retaining roadway, and the parameters of the supporting pier are determined. Combined with FLAC3D numerical simulation, this study develops a numerical model to investigate the surrounding rock stress distribution characteristics and deformation rules, as well as the stress and deformation rules of piers and pillars during the two mining periods of gob retaining roadway. The numerical results demonstrate that the compressible pier column supporting body adopted in this study can not only achieve better retaining effect in the roadway along the goaf, but also reduce the cost and labor.
Gob-side entry retaining, compressible pier column, surrounding rock movement, numerical simulation, pressure monitoring
DOI: 10.1134/S1062739120046897
REFERENCES
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SCIENCE OF MINING MACHINES
APPLICATION OF RISK-BASED MAINTENANCE USING ANALYTIC HIERARCHY PROCESS FOR SELECTION OF MAINTENANCE POLICY OF DRAGLINE
B. R. Sahoo and S. K. Palei*
Department of Mining Engineering, Indian Institute of Technology (B. H. U),
Varanasi, 221005 India
*e-mail: skpalei.min@iitbhu.ac.in
This paper proposes an approach to select the optimum maintenance policy for mining equipment using risk-based maintenance (RBM). RBM constitutes the process of risk assessment that identifies high-risk components of equipment, and analytic hierarchy process (AHP) that helps selecting an optimum maintenance policy for individual components. By applying RBM, three high-risk components of dragline such as reduction gearbox, bearing, and motor pinion shaft have been identified,and then AHP was used on these three components by considering four criteria, eight sub-criteria and four alternative maintenance policies (such as periodic, preventive, predictive and corrective maintenance). Local and global scores for these three components were calculated from the opinion of three experts of the case study mine. AHP global scores revealed that the optimum maintenance policy for reduction gearbox and motor pinion shaft was preventive maintenance, whereas for bearing it was periodic maintenance policy. Adoption of such maintenance planning is expected to reduce maintenance cost and downtime of the dragline.
Risk-based maintenance, AHP, coal mine, dragline
DOI: 10.1134/S1062739120046909
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MINERAL DRESSING
ZIRCONIUM AND RARE EARTHS RECOVERY FROM EUDIALYTE CONCENTRATE LEACHING SOLUTION
V. A. Chanturia, V. G. Minenko, A. L. Samusev*, E. V. Koporulina, and M. V. Ryazantseva
Academician Melnikov Research Institute
of Comprehensive Exploitation of Mineral Resources—IPKON,
Russian Academy of Sciences, Moscow, 111020 Russia
*e-mail: Andrey63vzm@mail.ru
The values of pH, temperature and initial concentrations of valuable components have influence on recovery efficiency of zirconium and rare earth elements (REE) from pregnant solutions of nitric-acid leaching of eudialyte concentrate by the chemical deposition method. Zirconium and rare earths exhibit selective recoverability of 99.95% and 87.50%, respectively. The loss of REE is 8.0% with zirconium product and 4.5% with pregnant solution. Micromorphology, structural chemistry and chemical composition of products are analyzed using the scanning electron microscopy, IR spectroscopy and X-ray fluorescence analysis.
Eudialyte concentrate, pregnant solution, nitric acid, separation, deposition, zirconium, rare earth elements
DOI: 10.1134/S1062739120046910
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STIMULATION OF THICKENING AND DEWATERING OF TAILINGS SLIME BY ULTRA-FLOCCULATION
N. K. Tusupbaev*, N. L. Medyanik**, A. M. Esengaziev, S. M. Bilyalova, and M. A. Ertaev
Institute of Metallurgy and Ore Beneficiation, Satbaev University, Almaty, 050010 Kazakhstan
*e-mail: n.tussupbayev@satbayev.university
Nosov Magnitogorsk State Technical University, Magnitogorsk, 455000 Russia
*e-mail: chem@magtu.ru
The article presents a case-study of thickening and dewatering of tailings slimes from Zhezkazgan Concentrating Plant using UltraflocTester machine and different Kemira’s Superfloc series flocculants. From among the test flocculants containing various polar groups, the anion-type A-150 flocculant has demonstrated the highest efficiency towards tailings slimes. Relatively dense slimes (100 g/l) should be treated at the velocity gradient G = 500–1000 s–1 for 12 s, while the slimes with the relative average density of 50 g/l should be treated at G = 1000–1500 s–1 for 6 s. The effect of the hydrodynamic stimulation on the residual suspended matter concentration in overflow and on the moisture content of flocculated precipitate before and after screening under pressure is assessed.
Tailings, thickening, screening, flocculation, flocculants, UltraflocTester, velocity gradient
DOI: 10.1134/S1062739120046922
REFERENCES
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FLOTATION AND ADSORPTION CAPACITIES OF DITHIOPYRILMETHANE IN GOLD RECOVERY FROM REBELLIOUS ARSENICAL GOLD ORE
T. N. Matveeva*, V. V. Getman, and A. Yu. Karkeshkina
Academician Melnikov Research Institute of Comprehensive Exploitation of Mineral Resources—IPKON, Russian Academy of Sciences, Moscow, 111020 Russia
*e-mail: tmatveyeva@mail.ru
The analytical reagent dithiopyrilmethane (DTM) is investigated in combination with potassium butyl xanthate (PBX) in gold recovery from low-sulphide arsenical gold ore. Thanks to two heterocycling rings in the structure, DTM attaches to nonferrous and noble metals. Adsorption of DTM at arsenopyrite and gold is determined using the electron and laser microscopy, as well as by IR and IV spectroscopy. In flotation of arsenopyrite with nano gold, the PBX–DTM combination increases both the yield of pure arsenopyrite and arsenopyrite with nano gold. The DTM–PBX flotation of Olimpiada ore has improved the quality of the concentrate in terms of the gold content by 3 times at the simultaneous increase of gold recovery and proportional decrease of gold loss with tailings. These results prove advisability of using DTM in integrated gold recovery from arsenical gold ore.
Flotation, adsorption, arsenopyrite, dithiopyrilmethane, nano gold, gold ore
DOI: 10.1134/S1062739120046934
REFERENCES
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WETTING OF SPHALERITE, CHALCOPYRITE AND PYRITE IN TREATMENT WITH SULFHYDRYL COLLECTORS IN SALTISH AND SEA WATER
A. A. Nikolaev*, A. Konyrova, and B. E. Goryachev
National University of Science and Technology—NUST MISIS, Moscow, 119049 Russia
*e-mail: nikolaevopr@mail,.ru
The article reports the studies into surface wetting of sphalerite, chalcopyrite and pyrite after treatment in saltish solution and in artificial sea water with concentration of 2, 8 and 16‰. The collecting agents were potassium isopropyl xanthate and sodium isopropyl dithiophosphate (Aeroflot). The results show that depending on concentration of sea salt and collector as well as on collector type, the surface of sulfide minerals can either be hydrophilic or hydrophobic, which can influence flotation efficiency of such minerals in saltish and sea water.
Flotation, wetting angle, hydrophobic behavior, xanthate, dithiophosphate, saltish solutions, sea water flotation, wetting, sphalertie, chalcopyrite, pyrite
DOI: 10.1134/S1062739120046946
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POROPERM PROPERTIES OF ROCK MASS: A CASE-STUDY OF UPWARD CAPILLARY MOVEMENT OF WATER SOLUTIONS IN VIBROACOUSTIC TREATMENT
A. G. Mikhailov*, A. E. Zuev, and A. I. Vashlaev
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia
*e-mail: chem@icct.ru
The vibroacoustic effect on poroperm properties of rock mass in case of directed upward water movement has been studied experimentally. The relationships of percolation velocity and sound load at different pressure gradients are obtained for fine sand. The experiments prove feasibility of multiple increase of percolation velocity in upward capillary movement of water solutions.
Rock mass, capillaries, upward percolation, vibroacoustic treatment, sound pressure
DOI: 10.1134/S1062739120046958
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STUDY ON PROCESS FOR RECOVERING IRON CONCENTRATE FROM IRON-CONTAINING SOLID WASTE IN MINES
F. R. Gan*, X. H. Peng, and B. Yang
Faculty of Resources and Environment Engineering, Yunnan Vocational Institute of Energy Technology,
Qujing, Yunnan Province, 655001 China
*e-mail: gfr3316@126.com
Faculty of Land Resource Engineering, Kunming University of Science and Technology,
Kunming, Yunnan Province, 650000 China
In order to recycle valuable elements from solid mine waste, this study took iron-bearing tailings as the research object and involved existing Hanging Vibrating Cone (HVC) concentrator separation technology to explore and determine the most appropriate processing parameters of this equipment for the experiment sample processing. The iron concentrates obtained by the experiment meet the Chinese Steel Industry criterion, within or up to a grade of 61.75 wt.% and the iron element recovery rate of 60.31%. So, a new and feasible way has been found for the reuse of mineral solid waste, which is rich in valuable elements.
Mine solid waste, iron-bearing tailings, iron recovery, hanging vibrating cone (HVC) concentrator
DOI: 10.1134/S106273912004696X
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