Journal of The South African Institute of Mining and Metallurgy最新文献_第10页

Investigation of the effects of SiC reinforcement ratio in iron-based composite materials on corrosion properties 铁基复合材料中SiC增强率对腐蚀性能影响的研究

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-08-03 DOI: 10.17159/2411-9717/1059/2022

H. Karabulut, M. Erden, K. Karacif, S. Gündüz

引用次数: 1

Field and laboratory research into the undrained behaviour of tailings at the University of Pretoria 比勒陀利亚大学对尾矿不排水特性的实地和实验室研究

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-08-03 DOI: 10.17159/2411-9717/1865/2022

S. Jacobsz, Y. Narainsamy

引用次数: 0

A review of EN 16907 on earthworks (extractive waste) in the context of South African mine residues 关于南非矿山残留物背景下土方工程（采掘废物）的EN 16907审查

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-08-03 DOI: 10.17159/2411-9717/1881/2022

F. Hörtkorn, Y. Narainsamy

引用次数: 0

Stability analysis of a free-standing backfill wall and a predictive equation for estimating the required strength of a backfill material - a numerical modelling approach 独立回填墙稳定性分析及回填材料强度预测方程——数值模拟方法

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-06-10 DOI: 10.17159/2411-9717/1544/2022

J. L. Porathur, S. Sekhar, A. Godugu, S. Bhargava

{"title":"Stability analysis of a free-standing backfill wall and a predictive equation for estimating the required strength of a backfill material - a numerical modelling approach","authors":"J. L. Porathur, S. Sekhar, A. Godugu, S. Bhargava","doi":"10.17159/2411-9717/1544/2022","DOIUrl":"https://doi.org/10.17159/2411-9717/1544/2022","url":null,"abstract":"Cemented backfilling has enabled underground hard rock mines to extract orebodies more safely with improved ore recovery. It is important to estimate the minimum required strength parameters for a backfill mix by optimizing the binder percentage to enable cost-effective and safe stoping operations. We conducted three-dimensional numerical modelling to study the effect of various stoping parameters on the stability of a free-standing backfill wall. A Mohr-Coulomb material model was used for the backfill material and the rock-fill interface. A strength reduction technique, excluding friction angle, was employed to arrive at a minimum stable strength value for the backfill. For a given combination of strength values, the stability state of the backfill wall could be demarcated using a displacement and yield zone tracking method. The numerical modelling results are compared to some earlier theoretical models. From the simulations, a predictive equation is developed to predict the required strength parameters for a backfill mix to ensure a stable free-standing wall. Examples are given of the successful use of the predictive equation at some underground hard rock mine sites in India.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45417257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Investigation of the mixing characteristics of industrial flotation columns using computational fluid dynamics 工业浮选柱混合特性的计算流体力学研究

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-06-10 DOI: 10.17159/2411-9717/1589/2022

I. Mwandawande, S. Bradshaw, M. Karimi, G. Akdogan

{"title":"Investigation of the mixing characteristics of industrial flotation columns using computational fluid dynamics","authors":"I. Mwandawande, S. Bradshaw, M. Karimi, G. Akdogan","doi":"10.17159/2411-9717/1589/2022","DOIUrl":"https://doi.org/10.17159/2411-9717/1589/2022","url":null,"abstract":"The mixing characteristics of industrial flotation columns were investigated using computational fluid dynamics (CFD). Particular emphasis was placed on the clarification of the relationship between the liquid and solids mixing parameters such as the mean residence time and axial dispersion coefficients. The effects of particle size and bubble size on liquid dispersion in the column were also studied. An Eulerian-Eulerian method was applied to simulate the multiphase flow, while additional scalar transport equations were introduced to predict the liquid residence time distribution (RTD) and particle age distribution inside the column. The results obtained show that particle residence time decreases with increasing particle size. The residence time of the coarser particles (112.5 pm) was found to be at least 60% of the liquid residence time, while the finer particles (19 pm) had a residence time similar to the liquid. The results also show that an increase in the particle size of the solids results in a decrease in the liquid vessel dispersion number, while a decrease in the bubble size increases liquid axial mixing. Finally, the simulated axial velocity profiles confirm the similarity between the liquid and solids axial dispersion coefficients in column flotation.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41856647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of vibration exposure of mine machinery operators at three different open-pit coal mines 三个不同露天煤矿矿山机械操作人员振动暴露评估

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-06-10 DOI: 10.17159/2411-9717/1728/2022

A. Tekin

{"title":"Assessment of vibration exposure of mine machinery operators at three different open-pit coal mines","authors":"A. Tekin","doi":"10.17159/2411-9717/1728/2022","DOIUrl":"https://doi.org/10.17159/2411-9717/1728/2022","url":null,"abstract":"In almost all branches of industry, machinery and equipment in operation cause vibration. Some sources of vibration affect only the operator's hands, fingers, and arms, while others have adverse effects on the entire -body. Various types and numbers of machines are utilized in the mining sector, and operators with them are exposed to mechanical vibrations caused by the mining machinery they use. A field study was conducted to evaluate the vibration risks to the operators using mining machines in open pit mines. Vibration levels and whole-body vibration (WBV) measurements using various types brands, and models of construction equipment were evaluated in three different mines in the west of Turkey and compared to the the criteria specified in the EU 2002/44/EC directive and ISO 2631-1 (1997) standards. The results showed that operators using mining machinery for 8 hours were exposed to WBV levels below the EU limit (1.15 m/s2), while 44% of these operators were exposed to levels above the EU action limit (0.5 m/s2). Measurement data collected from the working environment and the recommended improvements that need to be made to reduce WBV exposures are presented.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43360140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Overview of mine rescue approaches for underground coal fires: A South African perspective 煤矿井下火灾救援方法综述:以南非为例

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-06-10 DOI: 10.17159/2411-9717/1738/2022

M. Onifade, B. Genc, K. O. Said, M. Fourie, P. Akinseye

{"title":"Overview of mine rescue approaches for underground coal fires: A South African perspective","authors":"M. Onifade, B. Genc, K. O. Said, M. Fourie, P. Akinseye","doi":"10.17159/2411-9717/1738/2022","DOIUrl":"https://doi.org/10.17159/2411-9717/1738/2022","url":null,"abstract":"Coal is mined by both surface and underground methods and its extraction is normally characterized by numerous hazards that can lead to catastrophic accidents, which result in devastating effects such as injuries or fatalities, damage to mining assets, and destruction of mineral resources. These hazards exist due to the ability of coal to support combustion and its association with toxic, flammable, and explosive gases. Underground coal mining entails higher safety risks than opencast coal mining, chiefly because of issues relating to mine ventilation and mine collapse. Furthermore, coal mine collapses mostly occur due to crumbling of mining supports, especially in room and pillar mining systems. To avoid such adverse occurrences, safety management systems need to be in place. This study reviews the various technological safety systems and principles that are used for safe-rescue and self-escape of miners in underground coal fires, particularly in South Africa, using data obtained from Mines Rescue Services in Carltonville, South Africa. The outcome of the review shows that practising safety culture has been given priority across many South African underground coal mines through setting up safety management systems and encouraging workers to stay committed to safety principles.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48311357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Study on the ideal location of a bottom drainage roadway 底部排水巷道的理想位置研究

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-06-10 DOI: 10.17159/2411-9717/1561/2022

H. Chen, F. An, Z. Wang, X. Chen

{"title":"Study on the ideal location of a bottom drainage roadway","authors":"H. Chen, F. An, Z. Wang, X. Chen","doi":"10.17159/2411-9717/1561/2022","DOIUrl":"https://doi.org/10.17159/2411-9717/1561/2022","url":null,"abstract":"The bottom drainage roadway plays a crucial role in preventing coal and gas outbursts by using underground gas drainage methods. Therefore, it is essential to select the ideal position of the bottom drainage roadway. In this paper use a combination of geological data and numerical simulation to study the ideal position of the bottom drainage roadway, we taking the gas drainage of the first workface of No. 3 coal seam in the Yuxi coal mine in China as an example. The geological study showed a limestone marker layer at an average vertical distance of 14 m from the first mining face. Using this marker layer, the bottom drainage roadway could be excavated without the risk of accidentally exposing the coal seam, and less crosscutting borehole drilling from the bottom drainage roadway would be required. Based on the needs of gas control, the layout of the bottom drainage roadway was selected as an external stagger type. Combined with the numerical simulation results, when located 20 m outside of the mining workface 'footprint' on the horizontal projection, the bottom drainage roadway was a sufficient distance from the stress concentration area during mining of workface 1301, which facilitated roadway maintenance. Furthermore, the length of the crosscutting boreholes is also relatively short, which reduces the amount and cost of drilling. The results of this study are expected to provide a reference for the selection of an ideal position of the bottom drainage roadway in field engineering.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46849379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Implications of credit constraint on the formalization of artisanal and small-scale mining (ASM) in sub-Saharan Africa 信贷限制对撒哈拉以南非洲手工和小规模采矿正规化的影响

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-03-31 DOI: 10.17159/2411-9717/1665/2022

O. Eniowo, L. D. Meyer, S. R. Kilambo, L. Gerber

引用次数: 4

Void filling and water sealing in a decline in the Kalahari Manganese Field 卡拉哈里锰矿递减过程中的充填与止水

IF 0.9 4区材料科学

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2022-03-31 DOI: 10.17159/2411-9717/480/2022

I. Serepa, N. Steenkamp

{"title":"Void filling and water sealing in a decline in the Kalahari Manganese Field","authors":"I. Serepa, N. Steenkamp","doi":"10.17159/2411-9717/480/2022","DOIUrl":"https://doi.org/10.17159/2411-9717/480/2022","url":null,"abstract":"Investigations were conducted to determine the condition and stability of the existing decline at a mine in the Kalahari Manganese Field, Northern Cape Province, South Africa. During the inspection of the decline, voids were identified behind the concrete lining on the hangingwall and sidewalls over a total linear distance of 230 m. The voids did not provide confinement and, as a result, self-mining was occurring behind the lining. Water was flowing into the decline, over a total linear distance of 100 m, at areas where the decline intersected incompetent rock units, causing softening of the concrete lining and deterioration of the surrounding rock mass. Further damage to the concrete lining was caused by expansion and contraction of the wet red clay unit. Remedial work comprised void filling and water sealing to prevent further deterioration of the decline and ensure that it remained operable for the remainder of the life of mine. Void filling was accomplished by drilling rows of holes along the decline to access the voids and filling the voids with foam. This was followed by the sealing with polymer fluids. Telescopic pipes were also installed to allow water to drain off. A visual inspection was conducted and check-holes were drilled to assess the quality of the remedial work. The void filling material had penetrated cracks in the concrete lining, and areas where voids were intersected by check-holes were re-filled. Additional holes were drilled to re-seal areas that were still wet. The remedial work was completed successfully, as all voids were filled and stability achieved without compromising the concrete lining. The ingress of groundwater was also reduced to some residual dampness.","PeriodicalId":17492,"journal":{"name":"Journal of The South African Institute of Mining and Metallurgy","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46106121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0