Pub Date : 2023-11-29DOI: 10.1134/s1062739123040130
S. A. Kondrat’ev, I. A. Konovalov
Abstract
The authors propose the galena flotation mechanism based on the joint work of chemisorbed collector and physisorbed lead xanthate in molecular form. It is proved experimentally that the products of interaction between xanthate and lead ions possess surface activity dependent on the concentration ratio and on solution pH. In alkaline range, they spread over the gas–water interface and can remove water from the interlayer between a mineral particle and a gas bubble. In sub-acid medium and at the increased mole ratio of lead ions to xanthate anions, the spreading velocity of the interaction products decreases. The physisorption mechanism of the collector has disclosed the causes of high floatability of galena in the alkaline range of pH and the decreased floatability in the sub-acid domain.
{"title":"Effect of Collector Physisorption on Flotation of Galena with Xanthate and Pb2+","authors":"S. A. Kondrat’ev, I. A. Konovalov","doi":"10.1134/s1062739123040130","DOIUrl":"https://doi.org/10.1134/s1062739123040130","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The authors propose the galena flotation mechanism based on the joint work of chemisorbed collector and physisorbed lead xanthate in molecular form. It is proved experimentally that the products of interaction between xanthate and lead ions possess surface activity dependent on the concentration ratio and on solution pH. In alkaline range, they spread over the gas–water interface and can remove water from the interlayer between a mineral particle and a gas bubble. In sub-acid medium and at the increased mole ratio of lead ions to xanthate anions, the spreading velocity of the interaction products decreases. The physisorption mechanism of the collector has disclosed the causes of high floatability of galena in the alkaline range of pH and the decreased floatability in the sub-acid domain.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138507505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-29DOI: 10.1134/s1062739123040051
V. I. Klishin, A. N. Starodubov, V. A. Kramarenko, A. N. Kadochigova, A. V. Kaplun
Abstract
The new design of a powered roof support for the controlled longwall top coal caving in thick coal seams contains a special outlet and a reciprocating feeder. The introduction of such technology needs pre-testing and analysis of the outlet modes per the support units, such that to ensure the maximum allowable fill of the longwall conveyor without its overloading and dynamic phenomena. Created in Rocky DEM environment with that end in view, the simulation model takes into account the physical effect of rock mass fracture using the discrete element method, and enables variation in the design parameters and operating conditions of the powered roof support. The implemented experiments make it possible to assess the interdependence of the average velocity of coal outlet to the conveyor, the outlet gate angle and the feeder vibration frequency.
{"title":"Analysis of Coal Outlet Parameters by Simulation Modeling of Longwall Top Coal Caving","authors":"V. I. Klishin, A. N. Starodubov, V. A. Kramarenko, A. N. Kadochigova, A. V. Kaplun","doi":"10.1134/s1062739123040051","DOIUrl":"https://doi.org/10.1134/s1062739123040051","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The new design of a powered roof support for the controlled longwall top coal caving in thick coal seams contains a special outlet and a reciprocating feeder. The introduction of such technology needs pre-testing and analysis of the outlet modes per the support units, such that to ensure the maximum allowable fill of the longwall conveyor without its overloading and dynamic phenomena. Created in Rocky DEM environment with that end in view, the simulation model takes into account the physical effect of rock mass fracture using the discrete element method, and enables variation in the design parameters and operating conditions of the powered roof support. The implemented experiments make it possible to assess the interdependence of the average velocity of coal outlet to the conveyor, the outlet gate angle and the feeder vibration frequency.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138507481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-29DOI: 10.1134/s1062739123040154
A. A. Lavrinenko, P. A. Sysa
Abstract
A new device designed for wet magnetic separation—magnetic hydrocyclone—allows separating magnetic fraction from a fast and curved flow of pulp. The advantages of the magnetic hydrocyclone are the high specific output and the design simplicity which governs reliability of the device. The pattern of calculation of the magnetic hydrocyclonage performance represents an estimation of separability of magnetic fraction depending on the device geometry, variation in the magnetic field parameters, flow velocity and the physical parameters of the particles. The processing performance from calculations is compared with the results of the magnetic hydrocyclone testing. The proposed device is recommended to be included in the processing flow chart for ferruginous quartzite and other types of ore with the pronounced magnetic properties. Inclusion a magnetic system allowing higher magnetic induction up to 5–10 T in the flow chart makes it possible to extract weakly magnetic minerals.
{"title":"Prediction of Magnetic Hydrocyclonage Performance in Suspensions","authors":"A. A. Lavrinenko, P. A. Sysa","doi":"10.1134/s1062739123040154","DOIUrl":"https://doi.org/10.1134/s1062739123040154","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A new device designed for wet magnetic separation—magnetic hydrocyclone—allows separating magnetic fraction from a fast and curved flow of pulp. The advantages of the magnetic hydrocyclone are the high specific output and the design simplicity which governs reliability of the device. The pattern of calculation of the magnetic hydrocyclonage performance represents an estimation of separability of magnetic fraction depending on the device geometry, variation in the magnetic field parameters, flow velocity and the physical parameters of the particles. The processing performance from calculations is compared with the results of the magnetic hydrocyclone testing. The proposed device is recommended to be included in the processing flow chart for ferruginous quartzite and other types of ore with the pronounced magnetic properties. Inclusion a magnetic system allowing higher magnetic induction up to 5–10 T in the flow chart makes it possible to extract weakly magnetic minerals.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138507483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-29DOI: 10.1134/s1062739123040063
V. V. Laptev, S. V. Lukichev
Abstract
The article describes numerical modeling of sublevel stoping using the discrete element method. The study included development of a modeling procedure, creation and calibration of the numerical models, and the result analysis. The optimal design parameters of structural components of the mining system are found, which are promotive of reduced ore losses in sublevel stoping at the Khibiny apatite–nepheline deposits. Some behavioral patterns of rock mass during sublevel stoping are obtained. The mechanism of ore losses is described.
{"title":"DEM-Based Analysis of Ore Losses in Sublevel Stoping","authors":"V. V. Laptev, S. V. Lukichev","doi":"10.1134/s1062739123040063","DOIUrl":"https://doi.org/10.1134/s1062739123040063","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article describes numerical modeling of sublevel stoping using the discrete element method. The study included development of a modeling procedure, creation and calibration of the numerical models, and the result analysis. The optimal design parameters of structural components of the mining system are found, which are promotive of reduced ore losses in sublevel stoping at the Khibiny apatite–nepheline deposits. Some behavioral patterns of rock mass during sublevel stoping are obtained. The mechanism of ore losses is described.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138507486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-29DOI: 10.1134/s1062739123040014
M. V. Kurlenya, K. Kh. Lee, V. G. Kazantsev, H. U. Li, V. S. Zykov
Abstract
The apparatus of nonstationary thermoelasticity is used to estimate the joint and separate effects of gas pressure sorption and gravity on gas drainage and on stress state in the vicinity of underground openings. It is shown that gas flow changes the stress state of coal, and pressure in sorption essentially counteracts pressure in gravity. Ignorance of the latter fact may lead to a poorly substantiated choice of a coal gas drainage technology and to an erroneous prediction of rock strength and stability.
{"title":"Modeling Effects of Gravity on Gas Drainage in Methane-Containing Coal Seams","authors":"M. V. Kurlenya, K. Kh. Lee, V. G. Kazantsev, H. U. Li, V. S. Zykov","doi":"10.1134/s1062739123040014","DOIUrl":"https://doi.org/10.1134/s1062739123040014","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The apparatus of nonstationary thermoelasticity is used to estimate the joint and separate effects of gas pressure sorption and gravity on gas drainage and on stress state in the vicinity of underground openings. It is shown that gas flow changes the stress state of coal, and pressure in sorption essentially counteracts pressure in gravity. Ignorance of the latter fact may lead to a poorly substantiated choice of a coal gas drainage technology and to an erroneous prediction of rock strength and stability.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138507482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-29DOI: 10.1134/s1062739123040026
L. A. Nazarov, N. A. Golikov, A. A. Skulkin, L. A. Nazarova
Abstract
The experimental procedure is developed and tested on a laboratory scale and using layered samples of manmade geomaterials. Within the dual-permeability model, the procedure enables determining parameters that govern fluid flow and poroelastic deformation in fractured porous rock masses, namely, fracture permeability (k_1) and mass transfer coefficient (beta), as well as their dependence on stresses (sigma). The testing procedure is proposed and implemented. In the procedure, under the stepwise increasing normal stress (sigma), the stationary flow rates (Q_1(sigma)) and (Q_2(sigma)) are measured in a quasiregular fractured porous sample at the preset pressure difference: using a standard setup ((Q_1)) and in closed end-face fractures ((Q_2)). The mathematical model of the experiment is constructed, and the analytical solution of the problem on stationary flow is obtained: pressure patterns in fractures, and stress-dependence of flow rates. The experimental data interpretation algorithm enables calculating (k_1) and (beta) by the recorded flow rates (Q_1) and (Q_2). It is shown that the permeability (k_1) is proportional to (sigma^{-2}), and (beta) remains almost unchanged.
{"title":"Experimental Determination of Poroperm Properties of Fractured Porous Geomaterials within the Framework of Dual-Permeability Model","authors":"L. A. Nazarov, N. A. Golikov, A. A. Skulkin, L. A. Nazarova","doi":"10.1134/s1062739123040026","DOIUrl":"https://doi.org/10.1134/s1062739123040026","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The experimental procedure is developed and tested on a laboratory scale and using layered samples of manmade geomaterials. Within the dual-permeability model, the procedure enables determining parameters that govern fluid flow and poroelastic deformation in fractured porous rock masses, namely, fracture permeability <span>(k_1)</span> and mass transfer coefficient <span>(beta)</span>, as well as their dependence on stresses <span>(sigma)</span>. The testing procedure is proposed and implemented. In the procedure, under the stepwise increasing normal stress <span>(sigma)</span>, the stationary flow rates <span>(Q_1(sigma))</span> and <span>(Q_2(sigma))</span> are measured in a quasiregular fractured porous sample at the preset pressure difference: using a standard setup (<span>(Q_1)</span>) and in closed end-face fractures (<span>(Q_2)</span>). The mathematical model of the experiment is constructed, and the analytical solution of the problem on stationary flow is obtained: pressure patterns in fractures, and stress-dependence of flow rates. The experimental data interpretation algorithm enables calculating <span>(k_1)</span> and <span>(beta)</span> by the recorded flow rates <span>(Q_1)</span> and <span>(Q_2)</span>. It is shown that the permeability <span>(k_1)</span> is proportional to <span>(sigma^{-2})</span>, and <span>(beta)</span> remains almost unchanged.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138507515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-29DOI: 10.1134/s1062739123040075
V. A. Babello, M. V. Lizunkin
Abstract
Compressibility of strong and structurally disturbed rocks is determined for predicting land subsidence and stability during operation of transport machines. The plate-bearing tests are carried out on a large bench tester at different normal pressures and different densities of strong overburden rocks. The method to estimate deformability of strong overburden rocks using a plate and a station rod is described. The results were used to assess passability of transport machines during damming, and for the damp stability calculation.
{"title":"Deformation of Strong Overburden Rocks in Dams and Overburden Dumps during Operation of Transport Machines","authors":"V. A. Babello, M. V. Lizunkin","doi":"10.1134/s1062739123040075","DOIUrl":"https://doi.org/10.1134/s1062739123040075","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Compressibility of strong and structurally disturbed rocks is determined for predicting land subsidence and stability during operation of transport machines. The plate-bearing tests are carried out on a large bench tester at different normal pressures and different densities of strong overburden rocks. The method to estimate deformability of strong overburden rocks using a plate and a station rod is described. The results were used to assess passability of transport machines during damming, and for the damp stability calculation.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138507519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.1134/s1062739123050101
Abstract
This study focuses on the influence of proppant parameters on the long-term conductivity of hydraulic fractures. Embedment of proppants in fracture walls and proppant crushing was studied using FCMS-V fracture conductivity system, field emission scanning electron microscope, polarization microscope and the screening analysis. The correlations between the conductivity, grain size, grain-size composition, proppant concentration and placement technique, closure pressure of fractures and proppant embedment were revealed. Embedment and crushing of proppant grains of different size under different fracture closure pressures were discussed. The recommendations on proppant placement during hydraulic fracturing were given as a case study of coalbed methane production in YC site of Ordos Basin in China.
{"title":"Influence of Proppant Parameters on Hydraulic Fracture Conductivity","authors":"","doi":"10.1134/s1062739123050101","DOIUrl":"https://doi.org/10.1134/s1062739123050101","url":null,"abstract":"<span> <h3>Abstract</h3> <p>This study focuses on the influence of proppant parameters on the long-term conductivity of hydraulic fractures. Embedment of proppants in fracture walls and proppant crushing was studied using FCMS-V fracture conductivity system, field emission scanning electron microscope, polarization microscope and the screening analysis. The correlations between the conductivity, grain size, grain-size composition, proppant concentration and placement technique, closure pressure of fractures and proppant embedment were revealed. Embedment and crushing of proppant grains of different size under different fracture closure pressures were discussed. The recommendations on proppant placement during hydraulic fracturing were given as a case study of coalbed methane production in YC site of Ordos Basin in China.</p> </span>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139968635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.1134/s1062739123050058
Abstract
The article describes the studies on the geomechanical behavior of the large pitwall rock mass using the seismic method. The on-site measurements of elastic wave velocities in rock mass enabled determining the elastic characteristics of rocks, which allowed an inference on the rock mass stability. It is shown that the seismic method provides sufficiently reliable data on the time history of the geomechanical behavior of the large-area pitwall rock mass, and enables the geomechanics and stability control. The long-term experience of using the seismic method to ensure pitwall rock mass stability is presented as a case-study of Zhelezny Open Pit Mine, Kovdor Mining and Processing Plant. The proposed approach is applicable at deep open pit mines.
{"title":"Time History of Elastic Characteristics in Pitwall Rock Mass","authors":"","doi":"10.1134/s1062739123050058","DOIUrl":"https://doi.org/10.1134/s1062739123050058","url":null,"abstract":"<span> <h3>Abstract</h3> <p>The article describes the studies on the geomechanical behavior of the large pitwall rock mass using the seismic method. The on-site measurements of elastic wave velocities in rock mass enabled determining the elastic characteristics of rocks, which allowed an inference on the rock mass stability. It is shown that the seismic method provides sufficiently reliable data on the time history of the geomechanical behavior of the large-area pitwall rock mass, and enables the geomechanics and stability control. The long-term experience of using the seismic method to ensure pitwall rock mass stability is presented as a case-study of Zhelezny Open Pit Mine, Kovdor Mining and Processing Plant. The proposed approach is applicable at deep open pit mines.</p> </span>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139968389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.1134/s1062739123050174
Abstract
The supply of coal-fired thermal power plants with limestone as a sorbent in the flue gas desulfurization process highlights two key issues. Apart from the raw material quality adequate to meet the technological conditions of the installed desulfurization plants in thermal power systems with several potential production and user entities, the question of rational limestone supply arises. The paper presents a multi-attribute ranking model as a possible approach to solving such tasks.
{"title":"Multi-Attribute Ranking of Entities for Limestone Supply under the Conditions of Variable Thermal Power Complex Structure","authors":"","doi":"10.1134/s1062739123050174","DOIUrl":"https://doi.org/10.1134/s1062739123050174","url":null,"abstract":"<span> <h3>Abstract</h3> <p>The supply of coal-fired thermal power plants with limestone as a sorbent in the flue gas desulfurization process highlights two key issues. Apart from the raw material quality adequate to meet the technological conditions of the installed desulfurization plants in thermal power systems with several potential production and user entities, the question of rational limestone supply arises. The paper presents a multi-attribute ranking model as a possible approach to solving such tasks.</p> </span>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139968597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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