Archives of Mining Sciences最新文献_第7页

Economic Practicability of the Implementation of the Mine Refrigeration Technology for Normalization of Thermal Conditions 实施矿井制冷技术规范热工况的经济可行性

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/AMS.2020.133192

V. Alabiev, A. Dozorov, I. Savvateeva, V. Druzyanova, M. Sangadzhiev

引用次数: 1

Binding Capability of Ashes and Dusts from Municipal Solid Waste Incineration with Salt Brine and Geotechnical Parameters of the Cemented Samples 城市生活垃圾焚烧灰渣与盐水的结合性能及胶结物的岩土参数

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/AMS.2018.124983

K. Skrzypkowski, W. Korzeniowski, Katarzyna POBORSKA-MŁYNARSKA, Scalonych Próbek

{"title":"Binding Capability of Ashes and Dusts from Municipal Solid Waste Incineration with Salt Brine and Geotechnical Parameters of the Cemented Samples","authors":"K. Skrzypkowski, W. Korzeniowski, Katarzyna POBORSKA-MŁYNARSKA, Scalonych Próbek","doi":"10.24425/AMS.2018.124983","DOIUrl":"https://doi.org/10.24425/AMS.2018.124983","url":null,"abstract":"Based on laboratory tests of selected properties of secondary waste (ashes and dusts) from municipal waste incineration plants, the possibility of recovering some properties of waste in the process of filling the post-mining voids in the salt mine was assessed. The furnace bottom ash and the waste from the flue gas treatment from one of the national incineration plants were examined. The grain curves of dry waste and the density of the prepared mixtures were characterized. Twelve variants of the compositions of ash-based mixtures with varying proportions of the individual components were considered, taking into account both fresh water and brine. For each variant of the composition, the amount of redundant liquid appeared as well as the time of solidifying of the mixture to a certain strength and the compressibility values obtained. Considering the possibility of transporting mixtures in mines by means of pipelines at relatively long distances, and allowing the filling of large salt chambers to be filled and evenly filled, flow parameters were determined. In addition, the permeability of solidified waste samples was investigated, showing the potential for reducing the strength of the waste mass due to the action of water or brine. The technical feasibility of eliminating redundant liquid in the binding process has been confirmed, which is particularly important in salt mines. Preliminary values for the amount of binder (5%÷10%) to be added to the mixtures to obtain the specified strength properties of the artificially formed mass at Rc = 0.5 MPa. Attention was paid to the important practical aspect resulting from the rapid increase of this type of waste in the comming years in Poland and at the same time vast potential for their use in salt mining, where we have a huge capacity of salt chambers available.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47661997","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}

引用次数: 12

Influence of Rock Geomechanical Parameters on Increased Longwall Absolute Methane Emission Rate Forecasting Accuracy 岩石地质力学参数对提高长壁甲烷绝对排放率预测精度的影响

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2020.134139

A. Walentek, Krystian Wierzbiński

{"title":"Influence of Rock Geomechanical Parameters on Increased Longwall Absolute Methane Emission Rate Forecasting Accuracy","authors":"A. Walentek, Krystian Wierzbiński","doi":"10.24425/ams.2020.134139","DOIUrl":"https://doi.org/10.24425/ams.2020.134139","url":null,"abstract":"In longwall absolute methane emission rate forecasting, the range of the destressing zone is determined empirically and is not considered to be dependent on the geomechanical parameters of the rock strata. This simplification regarding destressing zone determination may result in significant differences between the forecast and the actual methane emission rates. During the extraction of coal seams using a system involving longwalls with caving under the conditions of low rock mass geomechanical parameters, the absolute methane emission rate forecasts are typically underestimated in comparison to the actual methane emission rates. In order to examine the influence of the destressing zones on the final forecasting result and to assess the influence of the rock mass geomechanical parameters on the increased accuracy of forecast values, destressing zones were determined for three longwalls with lengths ranging from 186 to 250 m, based on numerical modelling using the finite difference method (FDM). The modelling results confirmed the assumptions concerning the upper destressing zone range adopted for absolute methane emission rate forecasting. As for the remaining parameters, the destressing zones yielded great differences, particularly for floor strata. To inspect the accuracy of the FDM calculation result, an absolute methane emission rate forecasting algorithm was supplemented with the obtained zones. The prepared forecasts, both for longwall methane emission rates as well as the inflow of methane to the longwalls from strata within the destressing zone, were verified via underground methane emission tests. A comparative analysis found that including geomechanical parameters in methane emission rate forecasting can significantly reduce the errors in forecast values.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47869253","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}

引用次数: 2

A Gravity Flow Model of Fragmented Rocks in Longitudinal Sublevel Caving of Inclined Medium-Thick Ore Bodies 倾斜中厚矿体纵向分段崩落破碎岩体重力流模型

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/AMS.2019.129367

Xiufeng Zhang, Ganqiang Tao, Zhonghua Zhu

引用次数: 3

The conditions for proper operation of the arch-rectangular support 拱矩形支座正常使用的条件

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2019.126281

M. Rotkegel

{"title":"The conditions for proper operation of the arch-rectangular support","authors":"M. Rotkegel","doi":"10.24425/ams.2019.126281","DOIUrl":"https://doi.org/10.24425/ams.2019.126281","url":null,"abstract":"Steel arch-rectangular support has a wide range of applications in Polish coal mines due to its asymmetrical shape. The frame has an arched outline on one side of the side wall, while on the opposite side it is rectangular. As a result, the support is ideal for securing set up room and recovery room. It can also be successfully used to secure three-way intersections of underground workings. To a large extent, however, the importance of these advantages is diminished by relatively low load-bearing parameters, resulting from a partially straight canopy, as well as the asymmetrical distribution of the load acting on the support in underground conditions. In order to ensure the proper and optimal operation of such frames, in addition to the standard requirements for roof supports, additional conditions must be met. The basic requirement is to support the end of the canopy on the corner of the excavation. This article presents examples of arch-rectangular supports, their applications as well as laboratory tests and strength analysis of the frames and its elements. These tests allowed the requirements regarding the construction of the frame, the selection of the support and the conditions of building in the excavation to be specified.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44327552","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}

引用次数: 0

Combination of Artificial Neural Networks and Numerical Modeling for Predicting Deformation Modulus of Rock Masses 人工神经网络与数值模拟相结合预测岩体变形模量

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2020.133196

Narges Sadat Tayarani, S. Jamali, Mehdi Motevalli Zadeh

引用次数: 1

The Analysis of Coal Fines Separation Precision Exposed to Changeable Hydrodynamic Parameters of Jig Work 跳汰机流体动力参数变化下煤粉分选精度分析

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/122457

A. Surowiak

{"title":"The Analysis of Coal Fines Separation Precision Exposed to Changeable Hydrodynamic Parameters of Jig Work","authors":"A. Surowiak","doi":"10.24425/122457","DOIUrl":"https://doi.org/10.24425/122457","url":null,"abstract":"In technology of coal fines beneficiation in Poland mainly fines jigging processes are in use. In case of steam coal fines beneficiation it is till 80% of the whole amount of produced assortments, while in case of coking coal fines it is 100%. The necessary condition of not homogenous feed separation which is directed to beneficiation process in pulsating water stream is a sufficient liberation of particles. The stratification of particles in working bed causes that particles of certain size, density and shape gather in individual layers in working bed of jig. The introduction of sufficient amount of additional water determines appropriate liberation of particles group, which generates partition into concentrate and tailings. The paper presents the results of sampling of industrial jig used for the beneficiation of coal fines by three various settings of additional amount of water under sieve which is directed to jigging. These amounts were equal to 35, 50 and 70 [m 3 /h]. Collected samples of separation products were then sieved into narrow particle size fractions and divided into density fractions. In such narrow size-density fractions the coordinates of partition curves were calculated for tailings of hard coal fines, which were subsequently approximated by means of Weibull distribution function. The separation precision measured by separation density, probable error and imperfection were determined on the basis of obtained model separation curves. The evaluation of separation effects was performed for a wide particle size fraction: feed directed to jigging process and narrow particle size fractions. The analysis of separation results in size-density fractions allowed to determine the influence of particle size change on the value of probable error. The results of separation precision in size-density fractions were compared with effects of separation of wide particle fraction, i.e. feed directed to jigging process.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43430245","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}

引用次数: 7

Explosive Dust Test Vessel Comparison using Pulverized Pittsburgh Coal 匹兹堡煤粉爆炸粉尘试验容器的比较

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/123693

Jacob Miller, Jay Schafler, P. Mulligan, R. Eades, K. Perry, C. Johnson

{"title":"Explosive Dust Test Vessel Comparison using Pulverized Pittsburgh Coal","authors":"Jacob Miller, Jay Schafler, P. Mulligan, R. Eades, K. Perry, C. Johnson","doi":"10.24425/123693","DOIUrl":"https://doi.org/10.24425/123693","url":null,"abstract":"Explosions of coal dust are a major safety concern within the coal mining industry. The explosion and subsequent fires caused by coal dust can result in significant property damage, loss of life in underground coal mines and damage to coal processing facilities. The United States Bureau of Mines conducted research on coal dust explosions until 1996 when it was dissolved. In the following years, the American Society for Testing and Materials (ASTM) developed a test standard, ASTM E1226, to provide a standard test method characterizing the “explosibility” of particulate solids of combustible materials suspended in air. The research presented herein investigates the explosive characteristic of Pulverized Pittsburgh Coal dust using the ASTM E1226-12 test standard. The explosibility characteristics include: maximum explosion pressure, (Pmax); maximum rate of pressure rise, (dP/dt)max; and explosibility index, (Kst). Nine Pulverized Pittsburgh Coal dust concentrations, ranging from 30 to 1,500 g/m3, were tested in a 20-Liter Siwek Sphere. The newly recorded dust explosibility characteristics are then compared to explosibility characteristics published by the Bureau of Mines in their 20 liter vessel and procedure predating ASTM E1126-12. The information presented in this paper will allow for structures and devices to be built to protect people from the effects of coal dust explosions.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46788869","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}

引用次数: 2

The Unipore and Bidisperse Diffusion Models for Methane in Hard Coal Solid Structures Related to the Conditions in the Upper Silesian Coal Basin 与上西里西亚煤盆地条件有关的硬煤固体结构中甲烷的单孔和双分散扩散模型

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2020.134136

J. Krawczyk

{"title":"The Unipore and Bidisperse Diffusion Models for Methane in Hard Coal Solid Structures Related to the Conditions in the Upper Silesian Coal Basin","authors":"J. Krawczyk","doi":"10.24425/ams.2020.134136","DOIUrl":"https://doi.org/10.24425/ams.2020.134136","url":null,"abstract":"The safety of mining operations in hard coal mines must be constantly developed and improved. There is ongoing multi-directional research focused at best recognition of the phenomenon associated with the properties of the coal-gas system and its connections with mining and geological conditions. This article presents the results of sorption experiments on coals from the Upper Silesian Coal Basin, which are characterized by varying degrees of coalification. One of the parameters that describes the kinetics of methane sorption, determining and providing valuable information about gas hazard and in particular the risk of gas and rock outbursts, is the effective diffusion coefficient De. It is derived from the solution of Fick’s second law using many simplifying assumptions. Among them is the assumption that the carbon matrix consists of only one type of pore – micropores. In fact, there are quite often at least two different mechanisms, which are connected to each other, related to the diffusion of methane from the microporous matrix and flows occurring in voids and macropores. This article presents both the unipore and bidisperse models and a set of comparisons which fit them to experimental curves for selected coals. For some samples the more complex bidisperse model gave much better results than the classic unipore one. The supremacy of the bidisperse model could be associated with the differences in the coal structure related to the coalification degree. Initial results justify further analyses on a wider set of coals using the methodology developed in this paper.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45284421","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}

引用次数: 4

Caulking of Goafs Formed by Cave-in Mining and its Impact on Surface Subsidence in Hard Coal Mines 硬煤矿山采空区充填及其对地表沉降的影响

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2021.136694

A. Kowalski, T. Rutkowski

{"title":"Caulking of Goafs Formed by Cave-in Mining and its Impact on Surface Subsidence in Hard Coal Mines","authors":"A. Kowalski, T. Rutkowski","doi":"10.24425/ams.2021.136694","DOIUrl":"https://doi.org/10.24425/ams.2021.136694","url":null,"abstract":"The impact of caulking of goafs after mining exploitation of a hard coal seam with caving is expressed as the change in value of a a exploitation coefficient which, as defined, is the quotient of the maximum reduction in the surface height of a complete or incomplete trough to the thickness of the exploited seam. The basis for determining the value of the exploitation coefficient was geological and mining data combined with the results of the measurement of subsidence on the surface – measuring line 1222-1301 – of the ruda mine. There, mining was carried out between 2005 and 2019, with a transverse longwall system and the caulking of goafs. The research team used two methods to determine the impact of the caulking applied in the goafs on the value of the exploitation coefficient. in the first method the goafs are filled evenly along the whole longwall, and in the second method unevenly and on a quarterly basis. The determination of the values of the exploitation coefficients for selected measuring points was preceded by the determination of the parameters of the knothe-Budryk theory, which was further developed by J. Białek. The obtained dependencies are linear and the values of the correlation coefficients fall between –0.684 and –0.702, which should be considered satisfactory in terms of experimental data. it is possible to reduce the value of the exploitation coefficient by caulking the goafs by about 18%, when filling the goafs to 0.26% of the height of the active longwall.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45306889","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}

引用次数: 6