期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 763, 期 -, 页码 241-249出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.05.298
关键词
Precious metal; Chlorination roasting; Cyanide tailings; Thermodynamic analysis
资金
- National Natural Science Foundation of China [U1702252]
- Key cultivation disciplines of Liupanshui Normol University [LPSSYZDPYXK201708]
In this work, a chlorination roasting method for the extraction of precious metals (gold and silver) from the cyanide tailings (CT) was investigated. The decomposition mechanism of the CaCl2 used as chloride agent was presented during the chlorination roasting. The Au and Ag recovery as high as 91.6% and 54.7% under the optimum experiment conditions would be achieved. The optimal process conditions were identified to be a CaCl2 content 4%, chlorination temperature 1323 K and chlorination duration of 2 h. The microstructures of CT before and after roasting were examined by using scanning electron microscopy (SEM), and the volatilization process of the chloride of Au and Ag was assessed. The chlorination behaviors of all the phases in the CT in air atmosphere was analyzed using the thermogravimetric analysis (TGA), and the phase transformation of the main phase during roasting were analyzed by using X-ray diffraction (XRD). The chlorination roasting process shows unique advantage for treating the secondary sources of CT, additionally being environmentally benign. (C) 2018 Elsevier B.V. All rights reserved.
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