Journal of the Southern African Institute of Mining and Metallurgy最新文献

Assessment of coal washability data obtained via the RhoVol analyser 评估通过 RhoVol 分析仪获得的煤炭可洗性数据

IF 0.9 4区材料科学

Journal of the Southern African Institute of Mining and Metallurgy Pub Date : 2023-11-15 DOI: 10.17159/2411-9717/1047/2023

D. Stone, Q. Campbell, M. le Roux, M. Fofana

引用次数: 0

Structural frame analysis of an electrically powered robotic subsea dredging crawler under static loading conditions 静载荷条件下电动海底挖泥机器人履带的结构框架分析

IF 0.9 4区材料科学

Journal of the Southern African Institute of Mining and Metallurgy Pub Date : 2023-11-15 DOI: 10.17159/2411-9717/2308/2023

M.O. Ojumu, A.K. Raji

引用次数: 0

Contact sorption drying of chromite concentrates 铬矿精矿的接触吸附干燥

IF 0.9 4区材料科学

Journal of the Southern African Institute of Mining and Metallurgy Pub Date : 2023-11-15 DOI: 10.17159/2411-9717/2299/2023

C. Snyman, M. le Roux, Q. Campbell, S. Engelbrecht

{"title":"Contact sorption drying of chromite concentrates","authors":"C. Snyman, M. le Roux, Q. Campbell, S. Engelbrecht","doi":"10.17159/2411-9717/2299/2023","DOIUrl":"https://doi.org/10.17159/2411-9717/2299/2023","url":null,"abstract":"Due to the ultrafine particle size required for effective processing of chromite ores, dewatering of the concentrates presents a challenge. It is not uncommon for the ore to have elevated moisture contents even after dewatering, which must be reduced to required levels of between 8% and 10% by mass for further processing. Contact sorption drying has shown promise in test work on fine coal. This method was used to study the dewatering of chromite on a laboratory scale using 3 mm spherical activated alumina ceramic beads as a sorbent. Three different sorbent-to-chromite mass ratios, namely 0.5:1, 1:1, and 2:1, were tested with different process conditions, including dewatering in a stationary and a rotatingl bed. The experimental work showed that it was possible to achieve the target moistures in less than 10 minutes, irrespective of the sorbent-to-chromite ratio used. Ratios of 1:1 or higher, however, proved to be the best. The sorbent reusability at mass ratios of 1:1 and 2:1 were therefore tested. With a 1:1 mass ratio, the sorbents could be reused for three cycles, while with 2:1 ratio, the number of cycles increased to six. The sorbent-to-chromite mass ratio used had a significant influence on the required contact time and the reusability of the sorbents.","PeriodicalId":49025,"journal":{"name":"Journal of the Southern African Institute of Mining and Metallurgy","volume":"33 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139273537","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

Electrical resistivity of heat-treated charcoal 热处理木炭的电阻率

IF 0.9 4区材料科学

Journal of the Southern African Institute of Mining and Metallurgy Pub Date : 2023-11-15 DOI: 10.17159/2411-9717/2477/2023

R.D. Cromarty, S. Bharat, D. Odendaal

引用次数: 0

Real-time gypsum quality estimation in an industrial calciner: A neural network-based approach 工业煅烧炉中石膏质量的实时评估：基于神经网络的方法

IF 0.9 4区材料科学

Journal of the Southern African Institute of Mining and Metallurgy Pub Date : 2023-11-15 DOI: 10.17159/2411-9717/2480/2023

M. Jacobs, R-D. Taylor, F.H. Conradie, A.F. van der Merwe

{"title":"Real-time gypsum quality estimation in an industrial calciner: A neural network-based approach","authors":"M. Jacobs, R-D. Taylor, F.H. Conradie, A.F. van der Merwe","doi":"10.17159/2411-9717/2480/2023","DOIUrl":"https://doi.org/10.17159/2411-9717/2480/2023","url":null,"abstract":"Total bound moisture (TBM) is a typical quality indicator of industrial-grade gypsum. This gypsum is comprised of three distinct phases, namely anhydrite, dihydrate, and hemihydrate, of which only the latter is of much industrial use. TBM analysis is a lengthy laboratory procedure, and an artificial neural network (ANN) TBM inference measurement is proposed as a fast and online alternative. An ANN inference model for gypsum TBM based on plant data was developed. The inputs to the network were primarily focused on the plant's calciner, and different network topologies, data divisions, and transfer functions were investigated. Furthermore, the applicability of the TBM value as a quality indicator was investigated based on a gypsum phase analysis. A strong correlation between TBM and the gypsum hemihydrate and anhydrite content was found, validating the plant target TBM of 5.8% as a quality indicator. A network topology consisting of one hidden layer with logarithmic-sigmoid (logsig) and pure linear (purelin) transfer functions showed the best performance (R > 90%).","PeriodicalId":49025,"journal":{"name":"Journal of the Southern African Institute of Mining and Metallurgy","volume":"24 6","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139275555","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

Geostatistics: a common link between medical geography, mathematical geology, and medical geology. 地质统计学:医学地理学、数学地质学和医学地质学之间的共同联系。

IF 0.9 4区材料科学

Journal of the Southern African Institute of Mining and Metallurgy Pub Date : 2014-08-01

P Goovaerts

{"title":"Geostatistics: a common link between medical geography, mathematical geology, and medical geology.","authors":"P Goovaerts","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Since its development in the mining industry, geostatistics has emerged as the primary tool for spatial data analysis in various fields, ranging from earth and atmospheric sciences to agriculture, soil science, remote sensing, and more recently environmental exposure assessment. In the last few years, these tools have been tailored to the field of medical geography or spatial epidemiology, which is concerned with the study of spatial patterns of disease incidence and mortality and the identification of potential 'causes' of disease, such as environmental exposure, diet and unhealthy behaviours, economic or socio-demographic factors. On the other hand, medical geology is an emerging interdisciplinary scientific field studying the relationship between natural geological factors and their effects on human and animal health. This paper provides an introduction to the field of medical geology with an overview of geostatistical methods available for the analysis of geological and health data. Key concepts are illustrated using the mapping of groundwater arsenic concentration across eleven Michigan counties and the exploration of its relationship to the incidence of prostate cancer at the township level.</p>","PeriodicalId":49025,"journal":{"name":"Journal of the Southern African Institute of Mining and Metallurgy","volume":"114 ","pages":"605-612"},"PeriodicalIF":0.9,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4339079/pdf/nihms662116.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33088704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0