有色冶金(英文) Pub Date : 2022-01-01 DOI: 10.4236/ijnm.2022.102002

O. Teniola, A. Adeleke, S. Ibitoye, Moshood Deinde Shitu

引用次数: 0

Utilization of Various Analogy of Synthetic Nanoporous Zeolites and Composite of Zeolites for Decontamination/Detoxification of CWA Simulants—An Updated Review 合成纳米孔沸石和复合沸石的各种类比物在CWA模拟物去污解毒中的应用综述

有色冶金(英文) Pub Date : 2019-10-30 DOI: 10.4236/ijnm.2019.84004

Neeraj Kumar, K. Tiwari, Km. Meenu, Arti Sharma, A. Jain, Shikha Singh, R. Tomar

引用次数: 3

Effect of Sodium Oleate Concentration Variations on Froth Flotation of Manganese Ore 油酸钠浓度变化对锰矿石泡沫浮选的影响

有色冶金(英文) Pub Date : 2019-07-30 DOI: 10.4236/ijnm.2019.83003

O. Oladapo, Alabi Oladunni

引用次数: 1

Effect of Calcination Condition on Thermal Activation of Ibere Clay and Dissolution of Alumina 煅烧条件对粘土热活化及氧化铝溶解的影响

有色冶金(英文) Pub Date : 2019-04-03 DOI: 10.4236/IJNM.2019.82002

U. Mark, C. N. Anyakwo, O. Onyemaobi, C. S. Nwobodo

{"title":"Effect of Calcination Condition on Thermal Activation of Ibere Clay and Dissolution of Alumina","authors":"U. Mark, C. N. Anyakwo, O. Onyemaobi, C. S. Nwobodo","doi":"10.4236/IJNM.2019.82002","DOIUrl":"https://doi.org/10.4236/IJNM.2019.82002","url":null,"abstract":"Bauxite deposits for production of alumina are lacking in Nigeria and there is an aluminium smelter plant in the country which requires alumina for its operation. Development of alternative alumina resource using clays that are abundant in the country is the focus of this paper. The thermal activation of Ibere clay from southeastern Nigeria for optimal leaching of alumina was investigated. The clay assayed 28.52% Al2O3 and 51.6% SiO2, comprising mainly kaolinite mineral and quartz or free silica. The alumina locked up in the clay structure was rendered acid-soluble by thermal activation which transformed the clay from its crystalline nature to an amorphous, anhydrous phase or metakaolinite. The clay samples were heated at calcination temperatures of 500°C, 600°C, 700°C, 800°C, and 900°C at holding times of 30, 60, and 90 minutes. Uncalcined clay samples and samples calcined at 1000°C (holding for 60 minutes) were used in the control experiments. The result of leaching the clay calcines in 1 M hydrochloric acid solution at room temperature, showed that the clay calcines produced at 600°C (holding for 60 minutes) responded most to leaching. Samples calcined for 60 minutes also responded better than those held for 30 or 90 minutes. Based on activation energy studies, it was observed that calcines produced at 600°C (for 60 minutes) had both the highest leaching response (50.27% after 1 hour at leaching temperature of 100°C) and the lowest activation energy of 24.26 kJ/mol. It is concluded therefore that Ibere kaolinite clay should be best calcined for alumina dissolution by heating up to 600°C and holding for 60 minutes at that temperature. The clay deposit has potential for use as alternative resource for alumina production in Nigeria where bauxite is scarce.","PeriodicalId":60292,"journal":{"name":"有色冶金(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42317814","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: 6

Dissolution Behavior of Gold in Alkaline Media Using Thiourea 硫脲对金在碱性介质中的溶解行为研究

有色冶金(英文) Pub Date : 2019-01-01 DOI: 10.4236/ijnm.2019.81001

C. Vargas, P. Navarro, D. Espinoza, J. Manriquez, E. Mejia

{"title":"Dissolution Behavior of Gold in Alkaline Media Using Thiourea","authors":"C. Vargas, P. Navarro, D. Espinoza, J. Manriquez, E. Mejia","doi":"10.4236/ijnm.2019.81001","DOIUrl":"https://doi.org/10.4236/ijnm.2019.81001","url":null,"abstract":"In this work the dissolutive behavior of gold in alkaline medium using thiourea (TU), under different variables, was studied in a theoretical and experimental way, in order to determine the conditions under which it is feasible to dissolve gold in thiourea-alkaline medium. A thermodynamic study was conducted by chemical speciation using the method of Ro-jas-Hernandez, together with an electrochemical study where the electric potential was swept in the anodic direction. The main results of the thermodynamic study were that formamidine disulfide (FDS) and sulfinic compounds (S.C.) prevail at alkaline pH; by increasing the initial concen-tration of thiourea at alkaline pH, the presence of the gold complex is al-most zero for any initial concentration of thiourea. By including sodium sulfite in the gold-thiourea system, it was possible to obtain the Au(I)-TU complex at alkaline pH, with a presence of 95.13%. Electrochemical tests allowed verifying that in the absence of sodium sulfite the dissolution of gold in an alkaline medium is very slow but adding sodium sulfite im-provements become evident in the dissolution of the metal. Therefore, sodium sulfite catalyzes the gold dissolution process and stabilizes the thiourea. With this study it was possible to establish the feasibility of using thiourea in an alkaline medium for the dissolution of gold, and the conditions under which it is possible to dissolve the gold in that medium. With these fundamentals and conditions, it is now possible to move forward to test this system for minerals and/or concentrates containing gold.","PeriodicalId":60292,"journal":{"name":"有色冶金(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70710673","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: 4

Scientific Exploration and Practice of Safe Production Management of Non-Ferrous Metal Mines under the New Situation—Taking Dahongshan Copper Mine as an Example 新形势下有色金属矿山安全生产管理的科学探索与实践——以大红山铜矿为例

有色冶金(英文) Pub Date : 1900-01-01 DOI: 10.4236/ijnm.2022.103003

Yan Pan

引用次数: 0

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