Recovery processing method of cyanide barren solution

Abstract

The invention relates to a recovery processing method of cyanide barren solution, which comprises the following steps: at first, ammonia water is added in the cyanide barren solution, the mass ratio of the ammonia water and the cyanide barren solution is 0.5% to 2%; then the cyanide barren solution in which the ammonia water is added is pumped into an electrodialysis device, CN<-> in the cyanide barren solution passes through an anion-exchange membrane and enters a sodium cyanide recovery chamber under the action of a direct-current electric filed, metal cations such as Cu<2+> and Zn<2+> pass through a cation-exchange membrane and enter a metal ion recovery chamber, CN<-> is continuously released from a cyano complex in the cyanide barren solution along with the continuous decrease of CN<-> and heavy metal cations such as Cu<2+> and Zn<2+>, metal ions such as Cu<2+> and Zn<2+> and NH3 are continuously released from a copper-zinc metal ammino complex, so that cyanide ion CN<-> in the cyano complex is promoted to be released, and sodium cyanide and metal ions are recovered. The method can reduce the treatment cost of the cyanide barren solution, remarkably improves the recovery rate and the purity of cyanide ions in the cyanide barren solution, and removes the copper, zinc and other heavy metal ions in the cyanide barren solution.

Description

Technical field: [0001] The invention relates to a recovery and treatment method for poor cyanide solution, which belongs to the technical field of recovery and utilization of poor cyanide solution for gold extraction in gold smelting. Background technique: [0002] The cyanidation gold leaching method is an ancient gold extraction technology. This method is mature and is still the most important method for extracting gold and silver in gold smelters at home and abroad. With the strengthening of people's awareness of environmental protection, the zero discharge of cyanide wastewater has attracted more and more attention. At present, the zero-discharge method of cyanide sewage is to leach poor solution closed-circuit circulation, but due to the existence of a large amount of copper, zinc and other associated minerals in some gold concentrates, the concentration of copper, zinc and other metal complex ions in the cyanide poor solution will increase. It will seriously affect t...

AI Technical Summary

Problems solved by technology

At present, the zero-discharge method of cyanide sewage is to leach poor solution closed-circuit circulation, but due to the existence of a large amount of copper, zinc and other associated minerals in some gold concentrates, the concentration of copper, zinc and other metal complex ions in the cyanide poor solution will increase. It will seriously affect the cyanide leaching rate of gold

Now the treatment method of barren cyanide solution mainly adopts the acidification precipitation-reneutralization circulation method. Although this method can make the cyanide be well utilized, the metal ions therein are not well recovered and utilized, resulting in a large amount of waste residue, and the treatment process is more complex and costly

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