Laboratory cyanide copper plating waste liquor recycling method

Abstract

The invention relates to a laboratory cyanide copper plating waste liquor recycling method, which belongs to the field of waste liquor comprehensive utilization in an electroplating field. The method comprises the following steps of: firstly adding activated carbon into waste liquor to remove organic impurities, reducing the temperature of the waste liquor with refrigeration tablets so as to form sediments and remove carbonate, heating to melt sodium carbonate obtained through condensation, recrystallizing to obtain sodium carbonate, adding sodium sulphide into the waste liquor, sedimenting the contained metal elements of Pb<2+> and Zn<2+> through chemical reaction, arranging the waste liquor in an air-tight container, adding alkali, heating, and pressurizing to hydrolyze cyanide to produce nontoxic sodium formate and ammonia, distillating a treated solution, burning and harmlessly burying the rest solid substances. The invention provides a simple and feasible method for treating cyanide copper plating waste liquor in a laboratory, resources can be effectively recycled, and pollution is reduced.

Description

technical field [0001] The invention relates to a method for recycling laboratory cyanide copper plating waste liquid, and mainly discusses the function and operation method of the method. Background technique [0002] Environmental issues are currently the focus of human concern. Although cyanide copper plating has many advantages and has been used for many years, the cyanide used in the plating solution is highly toxic, and 0.1g of cyanide will cause death to people, animals and plants, so it is clearly prohibited or strictly controlled by the state. substance. In the cyanide copper plating experiment of zinc die castings simulated in the school laboratory, when the sodium carbonate content in the plating solution exceeds 75g / L, the current efficiency of the plating solution decreases, the coating is loose, the bright range is small, and burrs are generated. Easy to passivation; when the content of lead ions in the brightener of the plating solution exceeds 0.1g / L, the c...

AI Technical Summary

Problems solved by technology

In the cyanide copper plating experiment of zinc die castings simulated in the school laboratory, when the sodium carbonate content in the plating solution exceeds 75g / L, the current efficiency of the plating solution decreases, the coating is loose, the bright range is small, and burrs are generated. Easy to passivation; when the content of lead ions in the brightener of the plating solution exceeds 0.1g / L, the coating will be rough, the internal stress will increase, and the brittleness will increase; when the zinc ion content of the plating solution exceeds 1.5g / L, the coating will appear brassy, Because the school lacks a centralized treatment station for electroplating waste liquid, the waste liquid is usually poured directly into the sewer, so that the cyanide and heavy metal ions in the waste liquid will enter the soil and water sources, polluting the land and water sources, It is harmful to the health of human body, animals and plants, and at the same time causes a waste of resources. It is necessary and feasible to recycle waste cyanide copper plating solution