Pub Date : 2024-07-10DOI: 10.30686/1609-9192-2024-3-85-89
D.S. Yusov, P.V. Ivanova, S.L. Ivanov
Currently, ensuring energy security is a key priority for the country. Peat resources account for one-third of the country's total energy potential. Apart from energy production, peat finds extensive use in agriculture, chemical industry, construction, and the production of construction materials. Presently, milled peat constitutes the main volume of production in the country. The technology of its extraction involves preparing areas and removing undergrowth, stumps, and wood debris during preparation of the deposit by trenching or deep milling. However, due to the imperfections of the equipment, peat contamination and loss of its quality occur. This article analyzes means for carrying out preparatory operations to condition the surface of the deposit. It discusses the designs of end effectors for deep milling machines, their cutting structures, and the specific features of the tools used, i.e. blades, cutters, mills, chains. Classification of end effectors for peat machines as well as tools for deep milling of the deposit surface is proposed. This systematization involves identifying classification features by the type of machines, impact on the wood debris, movement of the end effector, its arrangement and design, as well as by parameters and types of the end effector’s cutting structures. The article may be useful for engineers, researchers, graduate students, and organizations involved in designing and studying processes of peat deposits conditioning.
{"title":"Systematization of end effectors of deep milling machines for peat extraction","authors":"D.S. Yusov, P.V. Ivanova, S.L. Ivanov","doi":"10.30686/1609-9192-2024-3-85-89","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-3-85-89","url":null,"abstract":"Currently, ensuring energy security is a key priority for the country. Peat resources account for one-third of the country's total energy potential. Apart from energy production, peat finds extensive use in agriculture, chemical industry, construction, and the production of construction materials. Presently, milled peat constitutes the main volume of production in the country. The technology of its extraction involves preparing areas and removing undergrowth, stumps, and wood debris during preparation of the deposit by trenching or deep milling. However, due to the imperfections of the equipment, peat contamination and loss of its quality occur. This article analyzes means for carrying out preparatory operations to condition the surface of the deposit. It discusses the designs of end effectors for deep milling machines, their cutting structures, and the specific features of the tools used, i.e. blades, cutters, mills, chains. Classification of end effectors for peat machines as well as tools for deep milling of the deposit surface is proposed. This systematization involves identifying classification features by the type of machines, impact on the wood debris, movement of the end effector, its arrangement and design, as well as by parameters and types of the end effector’s cutting structures. The article may be useful for engineers, researchers, graduate students, and organizations involved in designing and studying processes of peat deposits conditioning.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141661060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-15DOI: 10.30686/1609-9192-2024-2-57-62
S.Y. Panfilov, G. Dudnik, V.A. Tikhonov, S.S. Nazarov, N. O. Melnikov, N.I. Akinin
The research is aimed at improving the methods to produce and apply in the mining industry energy-intensive emulsions based on concentrated solutions of inorganic salts (nitrates), which are second-class dispersions of the "Water-inOil" type. Every year when mining useful minerals, surface and underground operations consume about 1.15 million tonnes of industrial emulsion explosives (IEE), the largest share of which are the so-called caseless pouring types. When the emulsion matrix is produced, it is possible that off-grade emulsion, i.e. emulsion that does not meet the requirements of the relevant normative and technical documentation, may also be generated. Tentatively, the volume of such production waste may reach 57.5 thousand tonnes per year. Therefore, the issues of reclaiming the off-grade emulsion semi-finished products of industrial explosives into initial products for their reuse is not only of scientific and technical interest, but also of great economic and ecological importance. The objective of this study, performed by employees of AZOTTECH LLC in cooperation with the D. I. Mendeleev Russian University of Chemical Technology, is the development of a method and industrial technology to recycle emulsion production wastes for re-use of the reclaimed materials in production. A chemical method of controlled emulsion destruction was obtained based on the results of the performed research activities. The most effective demulsifier available in the Russian market was selected, by means of which it was possible to separate the emulsion into immiscible phases containing the initial components. Samples of the stable emulsion matrix that match the requirements of the normative documents in terms of quality, were obtained using the oil phase reclaimed materials and the oxidant solution.
这项研究旨在改进采矿业生产和应用基于无机盐（硝酸盐）浓缩溶液的高能耗乳化液的方法，这种乳化液属于 "油包水 "类型的二级分散体。每年在开采有用矿物时，地面和地下作业都要消耗约 115 万吨工业乳化炸药（IEE），其中最大的份额是所谓的无外壳浇注类型。在生产乳化基质时，有可能会产生不合格的乳化液，即不符合相关规范和技术文件要求的乳化液。初步估计，这种生产废料的数量每年可能达到 5.75 万吨。因此，将工业炸药的劣质乳化液半成品回收为初始产品以便再利用的问题不仅具有科学和技术意义，而且还具有重要的经济和生态意义。这项研究由 AZOTTECH 有限责任公司员工与 D. I. 门捷列夫俄罗斯化工大学合作完成。门捷列夫俄罗斯化工大学合作进行，目的是开发一种回收乳液生产废料的方法和工业技术，以便在生产中重新使用回收的材料。根据已完成研究活动的结果，获得了一种可控乳化破坏的化学方法。选择了俄罗斯市场上最有效的破乳剂，通过这种方法可以将乳液分离成含有初始成分的不溶相。利用油相回收材料和氧化剂溶液，获得了质量符合规范文件要求的稳定乳液基质样品。
{"title":"Development of a method to reclaim off-grade emulsion semi-finished products of industrial explosives","authors":"S.Y. Panfilov, G. Dudnik, V.A. Tikhonov, S.S. Nazarov, N. O. Melnikov, N.I. Akinin","doi":"10.30686/1609-9192-2024-2-57-62","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-57-62","url":null,"abstract":"The research is aimed at improving the methods to produce and apply in the mining industry energy-intensive emulsions based on concentrated solutions of inorganic salts (nitrates), which are second-class dispersions of the \"Water-inOil\" type. Every year when mining useful minerals, surface and underground operations consume about 1.15 million tonnes of industrial emulsion explosives (IEE), the largest share of which are the so-called caseless pouring types. When the emulsion matrix is produced, it is possible that off-grade emulsion, i.e. emulsion that does not meet the requirements of the relevant normative and technical documentation, may also be generated. Tentatively, the volume of such production waste may reach 57.5 thousand tonnes per year. Therefore, the issues of reclaiming the off-grade emulsion semi-finished products of industrial explosives into initial products for their reuse is not only of scientific and technical interest, but also of great economic and ecological importance. The objective of this study, performed by employees of AZOTTECH LLC in cooperation with the D. I. Mendeleev Russian University of Chemical Technology, is the development of a method and industrial technology to recycle emulsion production wastes for re-use of the reclaimed materials in production. A chemical method of controlled emulsion destruction was obtained based on the results of the performed research activities. The most effective demulsifier available in the Russian market was selected, by means of which it was possible to separate the emulsion into immiscible phases containing the initial components. Samples of the stable emulsion matrix that match the requirements of the normative documents in terms of quality, were obtained using the oil phase reclaimed materials and the oxidant solution.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-15DOI: 10.30686/1609-9192-2024-2-151-159
S.N. Rakhmatov, N. Korobovsky, T.Sh. Pazylov, K. Kurmanaliev
Practical assessment of deposits and resources in the Kyrgyz Republic is based on the cost estimation, income and/ or cost methods. The aggregated economic indicators of reduced net cash flows and the internal rate of return, in the dominant sense, reflect the work of capital and premium on capital without legal and economic categories of the mining rent by types of payment for ownership of resources. Currently, the cost of a mining project is defined by the norms of imposed taxes and payments, and, to a large extent, by experimental innovations in the form of a share in the distribution of the net cash flows, bidding and auction payments. Based on the study of the Kumtor mining project for the period of 1996–2020, limits of the mining rent are defined by type, the influence of secondary factors of the economic return from mining and the factor of the project's influence on the macroeconomic indicators of the country. The integrated indicators of the three factors are combined into the category of resource value with the boundaries of revenue sharing for the subsoil owner and the investment capital.
{"title":"Hypothesis about the absolute value of subsoil resources","authors":"S.N. Rakhmatov, N. Korobovsky, T.Sh. Pazylov, K. Kurmanaliev","doi":"10.30686/1609-9192-2024-2-151-159","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-151-159","url":null,"abstract":"Practical assessment of deposits and resources in the Kyrgyz Republic is based on the cost estimation, income and/ or cost methods. The aggregated economic indicators of reduced net cash flows and the internal rate of return, in the dominant sense, reflect the work of capital and premium on capital without legal and economic categories of the mining rent by types of payment for ownership of resources. Currently, the cost of a mining project is defined by the norms of imposed taxes and payments, and, to a large extent, by experimental innovations in the form of a share in the distribution of the net cash flows, bidding and auction payments. Based on the study of the Kumtor mining project for the period of 1996–2020, limits of the mining rent are defined by type, the influence of secondary factors of the economic return from mining and the factor of the project's influence on the macroeconomic indicators of the country. The integrated indicators of the three factors are combined into the category of resource value with the boundaries of revenue sharing for the subsoil owner and the investment capital.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"14 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140974931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mining The article discusses the main failure causes of centrifugal pumps used in the mine dewatering plants. The factors causing intensive wear of the impellers used in centrifugal pumps of the CNS-33-66...330 type are analysed, as well as the ways of increasing their serviceability. The gas dynamic cold spraying is recognized as the most promising and efficient method of applying functional coatings, which makes it possible to improve the condition of the surface layer and eliminate surface defects of the initial impeller blanks, which have a significant impact on the serviceability of the parts. The main research trends are outlined in the studied area, and practical recommendations are provided on using the gas dynamic cold spraying methid both in the pump manufacturing process and in their overhaul. It is shown that one of the promising trends in development the gas dynamic cold spraying applications is the creation of multilayer coatings on the impeller blades based on compositions of various metal-ceramic powders. Along with the hardening treatment, this combination will allow to provide the impellers with a set of necessary functional characteristics for the hydro-abrasive wear conditions. technological process as a sequence of changing the natural state of the Earth's subsoil to obtain a certain quantity and quality of mineral products is characterized by departures from the specified normative parameter values, which is due to causes of different nature. Most of these causes are man-made, anf they are created during the performance of specific process operations by the personnel. The article presents an original approach to managing the control over the technological process parameters in a coal strip mine. To reduce the magnitude and probability of the process departures from the normative values, the authors propose to create technical and organizational control loops. Each loop is a closed chain of technical means and organizational tools, which secures up-keeping of the normative technological process state. Production risk is proposed to be used as a criterion to assess the efficiency of the control loops. The methodology allowing to calculate the risk is described. The results of the contour approach application to the technological process control at the Solntsevsky coal strip mine are presented.
{"title":"Extending the service life of centrifugal dewatering pump impellers in mines","authors":"V.V. Zotov, V.U. Mnatsakanyan, M.M. Bazlin, V.S. Lakshinsky, E.V. Dyatlova","doi":"10.30686/1609-9192-2024-2-143-146","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-143-146","url":null,"abstract":"Mining The article discusses the main failure causes of centrifugal pumps used in the mine dewatering plants. The factors causing intensive wear of the impellers used in centrifugal pumps of the CNS-33-66...330 type are analysed, as well as the ways of increasing their serviceability. The gas dynamic cold spraying is recognized as the most promising and efficient method of applying functional coatings, which makes it possible to improve the condition of the surface layer and eliminate surface defects of the initial impeller blanks, which have a significant impact on the serviceability of the parts. The main research trends are outlined in the studied area, and practical recommendations are provided on using the gas dynamic cold spraying methid both in the pump manufacturing process and in their overhaul. It is shown that one of the promising trends in development the gas dynamic cold spraying applications is the creation of multilayer coatings on the impeller blades based on compositions of various metal-ceramic powders. Along with the hardening treatment, this combination will allow to provide the impellers with a set of necessary functional characteristics for the hydro-abrasive wear conditions. technological process as a sequence of changing the natural state of the Earth's subsoil to obtain a certain quantity and quality of mineral products is characterized by departures from the specified normative parameter values, which is due to causes of different nature. Most of these causes are man-made, anf they are created during the performance of specific process operations by the personnel. The article presents an original approach to managing the control over the technological process parameters in a coal strip mine. To reduce the magnitude and probability of the process departures from the normative values, the authors propose to create technical and organizational control loops. Each loop is a closed chain of technical means and organizational tools, which secures up-keeping of the normative technological process state. Production risk is proposed to be used as a criterion to assess the efficiency of the control loops. The methodology allowing to calculate the risk is described. The results of the contour approach application to the technological process control at the Solntsevsky coal strip mine are presented.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"130 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140976914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper justifies the relevance of using compressed natural gas as the motor fuel for utility vehicles in conditions of the high north and the Republic of Yakutia. Natural gas as an alternative energy carrier is stated to have a number of advantages over diesel fuel, however, its use in extremely low temperatures, in particular, in Yakutia, is associated with some challenges. A number of technical solutions are proposed to maintain a constant temperature of compressed natural gas contained in the gas cylinders onboard of the utility vehicles. The paper provides a detailed description of the methods to maintain the required temperature of the compressed natural gas in the gas cylinders using heat from the exhaust gases of the combustion engine, as well as by means of flexible electric strip heaters. One of the possible ways to separate heavy hydrocarbons (C5-C7) that negatively affect the performance characteristics of the combustion engines and the operation efficiency of the gas cylinder equipment is described for production of the compressed natural gas for utility vehicles. Technical requirements are determined for rubber products of the gas cylinder equipment that operate at low ambient temperatures. The article suggests the optimal quality characteristics of the frost-resistant rubbers and sealing materials that are most suitable for application in conditions of Yakutia.
{"title":"Optimisation of the gas cylinder equipment operation of ALROSA's compressed gas utility vehicles in conditions of Yakutia","authors":"G.M. Dubov, I.V. Dvorovenko, S. Azikhanov, I.V. Zyryanov, I.A. Logvinov, D.K. Popov","doi":"10.30686/1609-9192-2024-2-84-91","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-84-91","url":null,"abstract":"The paper justifies the relevance of using compressed natural gas as the motor fuel for utility vehicles in conditions of the high north and the Republic of Yakutia. Natural gas as an alternative energy carrier is stated to have a number of advantages over diesel fuel, however, its use in extremely low temperatures, in particular, in Yakutia, is associated with some challenges. A number of technical solutions are proposed to maintain a constant temperature of compressed natural gas contained in the gas cylinders onboard of the utility vehicles. The paper provides a detailed description of the methods to maintain the required temperature of the compressed natural gas in the gas cylinders using heat from the exhaust gases of the combustion engine, as well as by means of flexible electric strip heaters. One of the possible ways to separate heavy hydrocarbons (C5-C7) that negatively affect the performance characteristics of the combustion engines and the operation efficiency of the gas cylinder equipment is described for production of the compressed natural gas for utility vehicles. Technical requirements are determined for rubber products of the gas cylinder equipment that operate at low ambient temperatures. The article suggests the optimal quality characteristics of the frost-resistant rubbers and sealing materials that are most suitable for application in conditions of Yakutia.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"59 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140972246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-15DOI: 10.30686/1609-9192-2024-2-104-110
V. Zubkov, D. Petrov
The paper considers the results of experimental studies of changes in the ore losses caused by congealing in the stoping zone during the drawing process in conditions of subzero temperatures in underground mining of eore deposits in the cryolithic zone, depending on the distance between the draw holes. Three series of experiments were performed using trench-shaped test benches with various distances betwen the draw holes. The distances between the access crosscuts were assumed to be 180, 200 and 220 mm, which is equal to 9, 10 and 11 m in actual conditions according to the adopted geometric scale of modeling. The results of modeling the bottom drawing in conditions of subzero temperatures, similar to the conditions of the underground ore mining in the cryolithic zone, showed that changes in the distance between the draw holes with the trench-shaped design of the bottom block have a significant impact on the extraction rates. When the distance between the draw holes is increased from 9 m to 11 m, the ore loss due to congealing during the draw phase rises from 24% to 42%. Experimental studies have shown that the increased distance between the draw holes in conditions of subzero temperatures in the bottom area leads to increased ore losses caused by congealing in the stoping area.
{"title":"Impact of the distance between the draw holes on the ore loss due to congealing during ore drawing","authors":"V. Zubkov, D. Petrov","doi":"10.30686/1609-9192-2024-2-104-110","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-104-110","url":null,"abstract":"The paper considers the results of experimental studies of changes in the ore losses caused by congealing in the stoping zone during the drawing process in conditions of subzero temperatures in underground mining of eore deposits in the cryolithic zone, depending on the distance between the draw holes. Three series of experiments were performed using trench-shaped test benches with various distances betwen the draw holes. The distances between the access crosscuts were assumed to be 180, 200 and 220 mm, which is equal to 9, 10 and 11 m in actual conditions according to the adopted geometric scale of modeling. The results of modeling the bottom drawing in conditions of subzero temperatures, similar to the conditions of the underground ore mining in the cryolithic zone, showed that changes in the distance between the draw holes with the trench-shaped design of the bottom block have a significant impact on the extraction rates. When the distance between the draw holes is increased from 9 m to 11 m, the ore loss due to congealing during the draw phase rises from 24% to 42%. Experimental studies have shown that the increased distance between the draw holes in conditions of subzero temperatures in the bottom area leads to increased ore losses caused by congealing in the stoping area.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"80 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-15DOI: 10.30686/1609-9192-2024-2-97-102
A.E. Salimov, D.A. Shibanov, S.L. Ivanov
High quality and timely maintenance and repair (M&R) of mine electric excavators is crucial to minimizing the risks of failures. The article analyzes the significance of factors the influence the failure rate, including such factors as ergatic, technical, climatic, organizational and technological. The analysis showed the greatest criticality of ergatic, technical and climatic factors, with ergatic being the most important of them. The failure rating of mine excavators by the following systems is presented: working attachments, lifting gear, pressure mechanism, traveling gear, hydraulic system, rotation gear and electrical equipment. The most critical are the working attachments, lifting gear and pressure mechanisms, which make up 72%. The principles to design the concept of conscientious maintenance and repair practice (CM&R) are shown. The Fine-Kinney principle is applied in numerical estimation of the failure risks of mine excavators. Digitalization of target operations for electric crawler-mounted power shovels is proposed and a list of coded types of operations is presented for efficient accounting of the maintenance and repair works. The proposed coding system allows systematization of the MRO processes, providing control and their analysis during the whole operation period.
{"title":"Failure risks of mine excavator associated with its maintenance and repair","authors":"A.E. Salimov, D.A. Shibanov, S.L. Ivanov","doi":"10.30686/1609-9192-2024-2-97-102","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-97-102","url":null,"abstract":"High quality and timely maintenance and repair (M&R) of mine electric excavators is crucial to minimizing the risks of failures. The article analyzes the significance of factors the influence the failure rate, including such factors as ergatic, technical, climatic, organizational and technological. The analysis showed the greatest criticality of ergatic, technical and climatic factors, with ergatic being the most important of them. The failure rating of mine excavators by the following systems is presented: working attachments, lifting gear, pressure mechanism, traveling gear, hydraulic system, rotation gear and electrical equipment. The most critical are the working attachments, lifting gear and pressure mechanisms, which make up 72%. The principles to design the concept of conscientious maintenance and repair practice (CM&R) are shown. The Fine-Kinney principle is applied in numerical estimation of the failure risks of mine excavators. Digitalization of target operations for electric crawler-mounted power shovels is proposed and a list of coded types of operations is presented for efficient accounting of the maintenance and repair works. The proposed coding system allows systematization of the MRO processes, providing control and their analysis during the whole operation period.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"19 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140974012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-15DOI: 10.30686/1609-9192-2024-2-93-96
S.S. Kobylkin, V.K. Ushakov, I.I. Kuznetsov
This paper aims to provide a quantitative assessment of the effect of local aerodynamic resistance on total mine airflow resistance with account for the friction resistance. The research includes laboratory tests, computer simulations in the Ansys CFD software as well as analytical inferences. The performed studies specified the magnitudes of local resistances at the turnings of mine workings. It has been established that the value of local resistance in all the sections can exceed 10% of the total mine aerodynamic friction resistance. This depends on the geometric parameters of the mine workings, which may result in a significant increase in the ratio of the local resistance value to the aerodynamic friction resistance value. The correlation of the two coefficients, i.e. the friction coefficient and the coefficient of local resistances, are proved to have a significant impact. The sharper the turns of the mine workings are, the greater the ratio of the local resistance to the aerodynamic friction resistance value is. Therefore, it is necessary to take this type of resistance into account when designing mine ventilation systems.
{"title":"Analysis of the impact of local resistance of mine workings on the total mine air-flow resistance","authors":"S.S. Kobylkin, V.K. Ushakov, I.I. Kuznetsov","doi":"10.30686/1609-9192-2024-2-93-96","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-93-96","url":null,"abstract":"This paper aims to provide a quantitative assessment of the effect of local aerodynamic resistance on total mine airflow resistance with account for the friction resistance. The research includes laboratory tests, computer simulations in the Ansys CFD software as well as analytical inferences. The performed studies specified the magnitudes of local resistances at the turnings of mine workings. It has been established that the value of local resistance in all the sections can exceed 10% of the total mine aerodynamic friction resistance. This depends on the geometric parameters of the mine workings, which may result in a significant increase in the ratio of the local resistance value to the aerodynamic friction resistance value. The correlation of the two coefficients, i.e. the friction coefficient and the coefficient of local resistances, are proved to have a significant impact. The sharper the turns of the mine workings are, the greater the ratio of the local resistance to the aerodynamic friction resistance value is. Therefore, it is necessary to take this type of resistance into account when designing mine ventilation systems.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"82 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-15DOI: 10.30686/1609-9192-2024-2-139-142
V.V. Arno, N. Lomakina, I. Garifulina, E. Elnikova, Е.A. Mikkelsen, I.A. Golubev
The article analyses the studies of factors affecting bench stability in the Nezhdaninskoye open-pit mine. It is determined that the fundamental factors are the vector location and characteristics of faults and cracks in the rock massif. The following three main systems of extended block-forming fractures were defined: (1) subvertical fractures with strike azimuth A = 290°; (2) fractures with strike azimuth A = 50° and dip angle into the massif P = 70°; (3) fractures with strike azimuth A = 50° and dip angle into the pit P = 40°. Basically, the extended surfaces of the rock massif discontinuities lie at an angle of 40-50° towards the mined-out space of the open pit. Individual extended fractures have the angle of 60-65°. The most probable fracture systems involved in bench collapse in case of unfavourable combination of the slope direction and the fracture system's dip are traced in the south-eastern walls of the open pits. There are no unfavourable surfaces in the northern and north-western walls. At the same time, faults running parallel to the benches create potential collapse zones, which requires additional measures to ensure their stability. The structural and tectonic framework of the rock massif has a significant impact on the formation and stability of the open-pit benches. Taking these factors into account when planning and developing open-pit mines will help ensure occupational safety and high efficiency of the mining process.
文章分析了对影响 Nezhdaninskoye 露天矿台稳定性因素的研究。研究确定，基本因素是岩体中断层和裂缝的矢量位置和特征。确定了以下三种主要的扩展块状断裂系统：(1) 走向方位角 A = 290°的俯冲断裂；(2) 走向方位角 A = 50°、与岩块的倾角 P = 70°的断裂；(3) 走向方位角 A = 50°、与矿坑的倾角 P = 40°的断裂。基本上，岩块不连续面的延伸表面与露天矿的开采空间成 40-50° 角。个别延伸断裂的角度为 60-65°。在露天采场的东南壁上，如果边坡方向和断裂系统倾角的组合不利，最有可能发生台阶坍塌的断裂系统。北壁和西北壁没有不利的断裂面。与此同时，与岩床平行的断层会造成潜在的塌陷区，这就需要采取额外的措施来确保其稳定性。岩层的结构和构造框架对露天矿台的形成和稳定性有重大影响。在规划和开发露天矿时考虑到这些因素，将有助于确保职业安全和采矿过程的高效率。
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Pub Date : 2024-05-15DOI: 10.30686/1609-9192-2024-2-65-69
V.A. Rakitin, Yu.V. Malakhov, D.A. Pashkov
The article presents the issue of short life of pneumatic tyres for mobile underground mining machines. It is noted that the correct choice of pneumatic tyres will increase the tyre life, but for a greater increase it is necessary to control the entire life cycle of the tyre, i.e. to carry out its service. The life cycle stages to be taken into account during tyre maintenance are presented. Control at each stage will minimise damage to the pneumatic tyres. The maintenance phase should include the records of tyre usage history and stock management. Analysis of the records will help to determine the reasons for tyre rejection and the wear conditions, the tyre condition before and after repair, and before and after retreading. Service maintenance of pneumatic tyres will allow planning the approximate level of stock, replacement periods and effective stock management. The article justifies the relevance of holding joint meetings of service specialists, tyre designers, and the company’s. In conclusion, it is noted that the issue of creating a national standard of service maintenance of pneumatic tyres for mobile underground mining machines is relevant.
{"title":"Service maintenance of pneumatic tyres for mobile underground mining machines","authors":"V.A. Rakitin, Yu.V. Malakhov, D.A. Pashkov","doi":"10.30686/1609-9192-2024-2-65-69","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-65-69","url":null,"abstract":"The article presents the issue of short life of pneumatic tyres for mobile underground mining machines. It is noted that the correct choice of pneumatic tyres will increase the tyre life, but for a greater increase it is necessary to control the entire life cycle of the tyre, i.e. to carry out its service. The life cycle stages to be taken into account during tyre maintenance are presented. Control at each stage will minimise damage to the pneumatic tyres. The maintenance phase should include the records of tyre usage history and stock management. Analysis of the records will help to determine the reasons for tyre rejection and the wear conditions, the tyre condition before and after repair, and before and after retreading. Service maintenance of pneumatic tyres will allow planning the approximate level of stock, replacement periods and effective stock management. The article justifies the relevance of holding joint meetings of service specialists, tyre designers, and the company’s. In conclusion, it is noted that the issue of creating a national standard of service maintenance of pneumatic tyres for mobile underground mining machines is relevant.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"50 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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