Method of comprehensively recycling valuable metals from gold concentrate acid leachate

Abstract

The invention relates to a method of comprehensively recycling valuable metals from gold concentrate acid leachate. The method comprises the steps of subjecting copper-bearing acid leachate, attainedby subjecting gold and silver concentrate to roasting and acid leaching, to multistage oxidation, adsorbing gold and silver by carbon, extracting and electrodepositing, chelating zinc ions, disintegrating chelate and other steps; the very stable chelate is formed by means of the chelating agent tetrapyridine methylethylenediamine and divalent zinc ions; zinc ions can be separated from a mixed solution containing copper ions, iron ions and otherness by means of organic solvent extraction; the zinc ion are effectively utilized accordingly. After both the copper ions and the zinc ions are separated from the acid leachate, the rest iron is recycled. Compared with traditional neutralizing methods, the method herein helps effectively recycle zinc and iron, with reduced cost to treat acid leachate and reduced ambient influence caused.

Description

technical field [0001] The invention relates to a method for recovering metallic zinc, in particular to a method for recovering valuable metals from an acid leaching solution of gold concentrate, and belongs to the technical field of chemical metallurgy. Background technique [0002] In recent years, the roasting cyanidation process of copper-containing gold and silver concentrates in the field of gold smelting is to roast the copper-containing gold and silver concentrates with water and oxygen in the air at a certain temperature. The obtained high-temperature flue gas enters the sulfuric acid production process, and the obtained calcined sand and dilute sulfuric acid are subjected to acid leaching under certain acid leaching conditions to produce a copper-containing acid leaching solution. The obtained copper-containing acid leaching solution enters the extraction and electrowinning process. The extraction is a modern wet The key step of copper extraction (leaching-extracti...

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Problems solved by technology

[0003] Although copper metal can be recovered very well through the traditional extraction-electrowinning process, the recovery of zinc metal and iron metal contained in gold concentrate has always been a problem. It is leached together with copper. In the existing process, the raffinate waste liquid containing zinc and iron (which also contains a small amount of copper remaining) is treated by lime neutralization, so that zinc and iron enter the lime This not only causes a waste of zinc and iron resources, but also has a high neutralization cost. Part of the resulting bottom slag can be sold to cement plants as raw materials for production, and the rest can only be stored. This not only takes up a lot of land, but also It has a serious impact on the surrounding environment. With the construction of a national conservation-oriented society and an environmentally-friendly society, there are many researches and applications on the effective recovery of metal zinc and iron in copper-containing acid leaching solutions, reduction of efflux and neutralization treatment costs. as important