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ArticleName Development of technological scheme for selective extraction of Fe, Zn, Cu, Pb, Au and Ag from zinc cakes
DOI 10.17580/tsm.2016.09.05
ArticleAuthor Voropanova L. A., Kokoeva N. B.

North-Caucasian Mining-Metallurgical Institute, Vladikavkaz, Russia:

L. A. Voropanova, Professor, e-mail:
N. B. Kokoeva, Post-Graduate Student


The developed low-waste, effective technology for processing of zinc cakes allows a selective extraction of iron, zinc, copper, lead, gold and silver from oxidized zinc cakes. This technology consists of the following basic production stages:
• sulfatization of cakes with oleum;
• leaching of sulfate sinter with a diluted sulfuric acid solution;
• hydrochlorination of pulp;
• extraction of iron and gold from the solution with tributylphosphate after hydrochlorination;
• extraction of zinc and silver;
• re-extraction of iron and zinc from extracts with a distilled water;
• re-extraction of gold and silver with a mixture of an 8% thiourea solution and 10% HCl solution.
The technology is designed for initial extraction of iron in the first portions of extractants, as the presence of iron in the solutions suppresses the extraction of zinc, silver and — to a significantly lesser degree — gold. Furthermore, iron oxide is formed; it is suitable for further use and is an inseparable part of gold extraction technology. The processes of extraction and re-extraction are performed with portion supply of extractants and re-extractants, which lowers their consumption and increases the selectivity of metal extraction. The developed technology enables selective extraction of valuable metals at a high rate, %: 88 Zn; 77 Fe; 98 Cu; 86 Pb; 90 Au; 86 Ag. The developed technology has fewer wastes than the Waelz process. If clinker amounts to around 65–70% of the processed cake’s mass, the offered technology enables a 3–5 times lower level of solid residue, i. e., up to 10–20% of the processed cake’s mass. The residue of hydrochlorination also needs to be buried, yet it contains an insignificant amount of non-ferrous metals and can be used for technical purposes.

keywords Cake, sulfatization, leaching, hydrochlorination, extraction, tributylphosphate, iron, zinc, copper, lead, gold, silver

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