Sequential Leaching in Kalechouyeh Polymetal Ore

Document Type : Research paper

Authors

1 tarbiat Modares University

2 TMU

Abstract

Polymetallic deposits refer to deposits in which more than one metal has economic value. The decrease in cut-off grade and the increase in the value of metals has meant that some deposits, which were previously only economical to exploit one metal, are now classified as polymetal deposits. Kalechoyeh polymetal ore is located in south of Naeen, Isfahan provice. To extract based and precious metals including copper, zinc, lead, gold and silver from this ore a stepwise leaching process was used. Sulphuric acid was used to dissolve copper and zinc, chloride solution to dissolve lead and silver, and finally cyanide to dissolve gold and the remaining silver. To this end, preliminary experiments were carried out to investigate the effect of various operating parameters and then, using the optimal values obtained in the preliminary tests, the final tests were performed using the column leaching method. The amount of recovery of elements by column leaching method in dimensions smaller than 12.7 mm and in a period of 25 days for copper and zinc at pH equal to 1 is 73.2 and 70.5 % respectively, for lead and silver at pH equal to 1 and the NaCl concentration of 250 g/l was equal to 35.3 and 21.6 %, and for gold and silver at pH equal to 10.5 and the concentration of cyanide was 1 g/l equal to 23.2 and 7.2 %.The results shows this sequantyial leaching method can be effectively used for poly metal ores to extract based and precious metals in future.

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References

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Journal of Separation Science and Engineering

Articles in Press, Accepted Manuscript
Available Online from 09 July 2024

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