Extraction of gold and silver in the selective chlorination roasting process of cyanidation tailing

The selective chlorination of cyanidation tailing (CT) for the extraction of gold and silver has been investigated. The reaction operated at different conditions and their effect on the extraction of Au and Ag was studied. The mineral samples were characterized by fire assay, X-ray diffraction (XRD)...

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Bibliographic Details
Published in:Separation science and technology 2018-02, Vol.53 (3), p.458-466
Main Authors: Li, Haoyu, Zhang, Libo, Koppala, Sivasankar, Ma, Aiyuan, Peng, Jinhui, Li, Shiwei, Yin, Shaohua
Format: Article
Language:English
Subjects:
Activation energy
Chemical reactions
Chlorides
Chlorination
Cyanidation
Cyanidation tailings
Dye dispersion
dynamic model
Fires
Fluorescence
Food processing
Gold
Microscopy
Mineral samples
noble metals
Potassium chloride
recovery
Removal
roasting
Silver
X-ray diffraction
X-ray fluorescence
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Summary:The selective chlorination of cyanidation tailing (CT) for the extraction of gold and silver has been investigated. The reaction operated at different conditions and their effect on the extraction of Au and Ag was studied. The mineral samples were characterized by fire assay, X-ray diffraction (XRD), X-ray fluorescence (XRF) and scanning electronic microscopy (SEM). The best recovery values were 95.32% of Au and 85.32% of Ag at 1373 K and 1.5 h with 5% KCl. The results show that gold chlorination reaction was controlled by the interfacial chemical reaction, and the apparent activation energy was 40.05 kJ/mol. Silver has an activation energy of about 8.97 kJ/mol, and silver removal is performed by diffusion control.
ISSN:0149-6395
1520-5754
DOI:10.1080/01496395.2017.1388258