ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa)最新文献_第7页

Noise Awareness and Noise Prevention as Strategies for Curtailing the Risk of Noise Induced Hearing Loss Among College Students in Osun State, Nigeria 噪音意识和噪音预防是减少尼日利亚奥松州大学生噪音引起听力损失风险的策略

ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa) Pub Date : 2018-11-19 DOI: 10.17758/eares4.eap1118454

引用次数: 0

Criminalizing Racism: How did Twitter react? 将种族主义定为犯罪:Twitter对此有何反应?

ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa) Pub Date : 2018-11-19 DOI: 10.17758/eares4.eap1118405

引用次数: 0

Effect of Reality Therapy in Reducing Examination Phobia Among Students of Fce(T) Bichi, Kano State 现实疗法在减少卡诺州Fce(T) Bichi学生考试恐惧症中的效果

ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa) Pub Date : 2018-11-19 DOI: 10.17758/eares4.eap1118408

引用次数: 1

Prediction of Dissolution of Copper from a Chalcopyrite Carbonatite Ore of South Africa 南非某黄铜矿碳酸岩中铜的溶蚀预测

ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa) Pub Date : 2018-11-19 DOI: 10.17758/eares4.eap1118232

B. Barlow, E. Fosso-Kankeu, K. Nyembwe, F. Waanders, E. Malenga

{"title":"Prediction of Dissolution of Copper from a Chalcopyrite Carbonatite Ore of South Africa","authors":"B. Barlow, E. Fosso-Kankeu, K. Nyembwe, F. Waanders, E. Malenga","doi":"10.17758/eares4.eap1118232","DOIUrl":"https://doi.org/10.17758/eares4.eap1118232","url":null,"abstract":"Chalcopyrite accounts for 70% of all copper bearing minerals and therefore has been studied closely to understand the dissolution kinetics in hope of overcoming the passivation film and increasing the extraction rates of copper. In this study carbonatite samples were obtained from a mining company in South Africa. The carbonatite samples were leached and the leachates were assessed for the metal ions content, pH, electrical conductivity (EC), RedOx potential (RP), acidity, major anions (sulphate, chloride) as well as iron ion concentration for speciation prediction. Speciation of metal ions was conducted through the use of PHREEQC modelling software. The main objective of the study was to determine the kinetic dissolution pattern of the run of mine (ROM) chalcopyrite samples from the carbonatite host rock over time as a varying factor. The mineralogical investigation showed that the ROM sample was dominated by calcite magnesium (Ca0.97 Mg 0.03 (CO3)). The elemental investigation showed that the sample was dominated by Ca and Fe with mass% of 49.81 and 26.31 respectively. The dissolution curve for copper displayed and overall decrease in dissolution rate of copper clearly showing the effects of passivation on the chalcopyrite mineral; a peak dissolution rate (22.8%) was observed after 7 hours of leaching. From the ICP data the major cation in the leachate of the ROM was determined to be Ca, Cu, Fe and Mg. The PHREEQC results showed that Ca, Cu and Mg was dominant as sulphate salt species while Fe was dominant as a free ionic species (Fe). Keywords— Carbonatite ores, Chalcopyrite, kinetic dissolution, pH, passivation, ORP, ROM, XRF, XRD.","PeriodicalId":8495,"journal":{"name":"ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76561164","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}

引用次数: 0

Photocatalytic Degradation of Naphthalene Using Tin Dioxide Nanomaterial under Visible Light 可见光下二氧化锡纳米材料光催化降解萘的研究

ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa) Pub Date : 2018-11-19 DOI: 10.17758/eares4.eap1118227

E. Fosso-Kankeu, D. Bruyn, Nthambeleni Mukwevho, F. Waanders

引用次数: 0

Testing of Briquettes Made from Witbank Coal Fines with Polyvinyl Alcohol as Binder 以聚乙烯醇为粘结剂的Witbank煤粉型煤的试验研究

ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa) Pub Date : 2018-11-19 DOI: 10.17758/eares4.eap1118226

C. Henning, N. T. Leokaoke, J. Bunt, F. Waanders

引用次数: 3

A Predictive Model for Wet High Intensity Magnetic Separator (WHIMS) using Artificial Neural Networks 基于人工神经网络的湿式强磁选机预测模型

ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa) Pub Date : 2018-11-19 DOI: 10.17758/eares4.eap1118253

C. Reichel, A. V. D. Merwe, J. Cronje

{"title":"A Predictive Model for Wet High Intensity Magnetic Separator (WHIMS) using Artificial Neural Networks","authors":"C. Reichel, A. V. D. Merwe, J. Cronje","doi":"10.17758/eares4.eap1118253","DOIUrl":"https://doi.org/10.17758/eares4.eap1118253","url":null,"abstract":"Abstract—Materials can be classified into three major categories based on the magnetic susceptibility thereof; the property governing the response of the material subjected to a magnetic field. Chromium has many uses in the industry, with stainless steel production being the most important. Chromite ore in South Africa is mainly mined in the Bushveld complex situated in the central western region of the Highveld. Magnetic separation is the physical separation of discrete particles. Wet high-intensity magnetic separation (WHIMS) is commonly used in the gold, uranium, iron and chromite recovery industries. The WHIMS system is based on the imbalance of forces on particles. These forces are magnetic, gravitational, centrifugal, frictional or inertial, and attractive or repulsive forces in favour of the magnetic forces, all due to the production of a magnetic field. During the experimental procedure, single stage separation was used for the aim of this project. Operational parameters such as magnetic intensity (flux), wash water flow rate, feed flow rate and feed density along with particle size are varied. The primary objectives in this study were to obtain experimental data from a laboratory scale WHIMS and to use this data to construct an artificial neural network (ANN) able accurately predict grade, yield and recovery. Sampling and analysis were used to determine the recoveries, grades and yields for the varied operating conditions. The material used during this study is chromite ore. The ANN’s predicted the grade, recovery and yield with high accuracy. The data from experimentation suggest that the WHIMS system recovers best at smaller particle sizes.","PeriodicalId":8495,"journal":{"name":"ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76337820","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}

引用次数: 0

Facile Synthesis of Struvite from Municipal Wastewater Using Pre-Treated Magnesite 用预处理菱镁矿从城市污水中快速合成鸟粪石

ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa) Pub Date : 2018-11-19 DOI: 10.17758/eares4.eap1118119

引用次数: 1

Potentially Toxic Elements Contamination of Soils in O’Kiep, an Arid Region of Namaqualand, South Africa 南非纳马夸兰干旱地区O 'Kiep土壤的潜在有毒元素污染

ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa) Pub Date : 2018-11-19 DOI: 10.17758/eares4.eap1118238

I. G. Erdogan, E. Fosso-Kankeu, F. Waanders, S. K. Ntwampe, N. Hoth

引用次数: 0

Mineralogical Study of Pingel-Bauchi Malachite Ore Pingel-Bauchi孔雀石矿石矿物学研究

ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa) Pub Date : 2018-11-19 DOI: 10.17758/eares4.eap1118203

引用次数: 1