Treatment and reuse method for cupric-cyanide-containing waste water

Abstract

The invention provides a treatment and reuse method for cupric-cyanide-containing waste water. The treatment and reuse method comprises a low-concentration cyanophoric material ion recovery process and a cuprous extraction process, wherein the low-concentration cyanophoric material ion recovery process mainly comprises the steps that: (1) the cupric-cyanide-containing waste water is subjected to cartridge filtration for removing impurities in the cupric-cyanide-containing waste water; and (2) the cupric-cyanide-containing waste water subjected to impurity removal is introduced into a cyanide ion recovering machine, cyanide complexes and free cyanogen in the cupric-cyanide-containing waste water are collected, and an analysis concentrated solution and cyanogen-removed waste water are obtained. The cuprous extraction process mainly comprises the steps that: (1) the analysis concentrated solution is pumped into an extraction sealing tank; (2) inert gas is injected into the extraction sealing tank so that the analysis concentrated solution boils, extraction agents formed by proportionally mixing H2SO4 and NaCl are added, and obtained HCN enters a cyanogen recovery tank; and (3) remaining backing materials in the extraction sealing tank are CuCl, and CuCl finished products are obtained after vacuum drying and centrifugation. Therefore cyanogen and copper in the cupric-cyanide-containing waste water are respectively recovered and reused.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating wastewater containing copper cyanide. Background technique [0002] Cyanide copper plating is a very important process in the electroplating process. It is the base coating of the plated parts, which is related to the final quality of the processed products, and cyanide is the best complexing agent and activator for metals. The current treatment of copper cyanide-containing wastewater basically adopts a two-stage method for breaking cyanide, which uses a strong oxidant similar to sodium hypochlorite to oxidize the cyanide radical (CN ˉ ) and the complex of cyanide [Cu(CN) 2 ] ˉ , produce non-toxic nitrogen and carbon dioxide after oxidation, the reaction equation is: OCL ˉ +CN ˉ →N 2 ↑+CO 2 ↑, the use of strong oxidants to break the cyanide process is stable, and the treatment cost is quite high. The secondary oxidation cyanide breaks consumes a larg...

AI Technical Summary

Problems solved by technology

The current treatment of copper cyanide-containing wastewater basically adopts a two-stage method for breaking cyanide, which uses a strong oxidant similar to sodium hypochlorite to oxidize the cyanide radical (CN ˉ ) and the complex of cyanide [Cu(CN) 2 ] ˉ , produce non-toxic nitrogen and carbon dioxide after oxidation, the reaction equation is: OCL ˉ +CN ˉ →N 2 ↑+CO 2 ↑, the use of strong oxidants to break the cyanide process is stable, and the treatment cost is quite high. The secondary oxidation cyanide breaks consumes a lot of bleach (NaCLO)

Images