Plating solution wastewater treatment method for nickel plating of plated part

Abstract

The invention relates to a plating solution wastewater treatment method for nickel plating of plated parts, which comprises the steps that a production line pickling solution or pickling waste liquid serves as a catalyst to be added into chemical plating solution wastewater, and the pH of the wastewater is adjusted to 3-7; stirring for 5-20 minutes and performing standing; adding sodium hypochlorite, adjusting the pH value to 6-8, reacting and performing standing for 6-12 hours to obtain a solution A, adding lime milk, adjusting the pH value to be not less than 11, reacting and performing standing for not less than 2 hours, generating nickel hydroxide, calcium phosphate and calcium phosphite precipitates in the process to obtain a supernatant C, adding a calcium chloride / PAC mixed solution, reacting and performing standing for not less than 2 hours to obtain a supernatant D, adding a PAM coagulant for adsorption treatment, wherein the standing time is not less than 2h, and after mud-water separation, discharging the supernatant into a wastewater station so that the treatment is completed. The method has the advantages that the complex breaking oxidation and precipitation efficiency is improved, the precipitant is accurately controlled, the use amount of reagents is small, the generated solid waste amount is small, the occupied area is small, operation is simple, integrated control can be achieved, the pH value does not need to be repeatedly adjusted, and the operation cost is low.

Description

technical field [0001] The present application relates to the technical field of electroless plating wastewater treatment, in particular to a method for treating plating solution wastewater for nickel plating of plating pieces. Background technique [0002] According to the different plating process (electroplating or chemical plating), the surface treatment can be simply divided into ionic heavy metal wastewater, complex heavy metal wastewater and other high-salt wastewater. Among them, the electroless plating solution wastewater contains metal nickel complexes, and the substances that form coordination with nickel are mostly organic acids. Due to the special coupling effect of these electroless plating agents, organic matter and heavy metal ions are coupled into stable complexes, making it difficult to It is oxidized by common oxidants. At the same time, these heavy metal complexes have large molecular weight, low biochemical oxygen demand (often recorded as BOD) of water ...

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Problems solved by technology

However, due to the limited exchange capacity of the resin, the processing capacity of the ion exchange resin is small, and the regeneration cycle of the resin is relatively frequent, which brings certain troubles to the operation and management; and the operation of the ion exchange method is complicated, and some anion exchange resins contain When the active group of the exchange ion exchanges with the phosphite, the ion exchanged by itself will be introduced into the wastewater, which may cause secondary pollution to the wastewater, thus making the subsequent treatment more complicated; moreover, the elution generated during the treatment process Both the liquid and the washing water contain a small amount of nickel, and these waste water need to be further treated, thereby increasing the cost of industrial production; in addition, the investment cost of the ion resin exchange process is large, and the cost is too high

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