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Hydrometallurgical application for treating a Nigerian chalcopyrite ore in chloride medium:Part *** kinetics assessment

International Journal of Minerals,Metallurgy and Materials 2013年第11期20卷 1021-1028页

作者： Alafara A.Baba Kuranga I.Ayinla Folahan A.Adekola Rafiu B.Bale Malay K.Ghosh Abdul G.F.Alabi Abdul R.Sheik Ismael O.Folorunso Department of Industrial Chemistry University of IlorinP.M.B.1515 Department of Chemistry Institute of Basic and Applied SciencesKwara State PolytechnicP.M.B.1375 Department of Geology and Mineral Sciences University of IlorinP.M.B.1515 Hydro & Electrometallurgy Department Institute of Minerals and Materials Technology Department of Materials & Metallurgical Engineering University of IlorinP.M.B.1515

The dissolution kinetics of a Nigerian chalcopyrite ore in hydrochloric acid was studied in this article. Acid concentration, reaction temperature, and ore particle size were chosen as experimental parameters. The chemical and morphological studies of the ore before and after leaching at optimal conditions were carried out by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. It is revealed that increasing the acid concentration and system temperature and decreasing the ore particle size greatly enhances the dissolution rate. The dissolution kinetics was found to follow the shrinking core model for the diffusion control mechanism where the activation energy （Ea） of 32.92 ***1-1 was obtained for the process and supported by morphological changes at a higher dissolution of 91.33%.

关键词： chalcopyrite hydrometallurgy leaching, hydrochloric acid dissolution ore treatment

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Deselenization and detellurization of precious-metal ore concentrates by swelling oxidizing roasting and successive alkaline leaching

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International Journal of Minerals,Metallurgy and Materials 2017年第2期24卷 147-155页

作者： Fu-yuan Zhang Ya-jie Zheng Guo-min Peng School of Metallurgy and Environment Central South University Changsha 410083 China Henan Zhongyuan Gold Smelter Co. Ltd. Sanmenxia 472000 China Key Laboratory of Comprehensive Utilization of Gold Resource Sanmenxia 472000 China

A new technique of swelling oxidizing roasting and alkaline leaching was proposed for deselenization and detellurization of pre- cious-metal ore concentrates. Alkali-metal and alkaline-earth-metal chlorides and carbonates were preliminarily selected as swelling agents. The roasting removal rate and alkaline leaching rate of selenium and tellurium were investigated, and NaCl was selected as an appropriate swelling agent. Furthermore, the effects of various factors on the selenium gasification rate and leaching rate of selenium and tellurium were investigated. The results show that the selenium gasification rate reaches 88.41% after swelling oxidizing roasting for 2 h at 510~C using an NaC1 dosage coefficient of 100 and a sulfuric acid dosage coefficient of 1.3; the amorphous elemental tellurium is completely transformed into TeO2. The roasted product is subjected to alkaline leaching using a 100 g/L NaOH solution, which results in a selenium leaching rate of 10.51%, a total selenium removal rate of 98.92%, and a tellurium leaching rate of 97.64%. In the alkaline leaching residue, the contents of selenium, tellurium, gold, platinum, and palladium are 0.7825%, 5.492%, 8.333%, 0.2587%, and 1.113%, respectively; the precious metals are enriched approximately sixfold.

关键词： ore treatment precious metals roasting leaching selenium removal tellurium removal

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Application and Corollary of Stable Substances Distribution Equation

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Rare Metals 1990年第1期10卷 58-62页

作者： Zhang, Suolin Wei, Yu Zheng, He Hebei Normal Univ China

In this paper, the application of stable substance distribution equation (SSDE) of M-medium systems to calculation of E-pH diagrams is analysed. After applying SSDE to other thermodynamic systems, many useful results ... 详细信息

关键词： Chemical Reactions Thermodynamics Computer Programming Flowcharting Hydrogen Ion Concentration Calculations Hydrometallurgy Phase Diagrams ore treatment Leaching

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