Processing method and corresponding processing system for chemical nickel plating waste liquid containing nitric acids

Abstract

The invention discloses a processing method for chemical nickel plating waste liquid containing nitric acids, and particularly relates to an environmentally-friendly processing method. Considerable integrated environment and economic benefits are generated. The method comprises the following steps: (1) the waste liquid containing nickel is filtered to remove mechanical impurities; (2) the nitric acids are separated from the waste liquid containing the nickel through a diffusion dialysis membrane; (3) the pH of the waste liquid containing the nickel passing through the membrane is adjusted, the pH is adjusted to 3.5-4.0, and then the waste liquid containing the nickel, of which the pH is adjusted, is filtered; (4) the waste liquid containing the nickel passes through chelate resin, so that the nickel is recovered, and then the nickel adsorbed on the resin is eluted by hydrochloric acids to obtain nickel chloride; (5) oxidizers are added to the waste liquid passing through the resin, high-temperature oxidation and dephosphorization are performed, then filtration is performed, precipitates formed by calcium and phosphate are filtered, and calcium phosphate is recovered; (6) heavy metal ion trapping agents are added to filtrate, and a reaction is performed for 30-40 minutes; (7) flocculants PAC and PAM are added to the filtrate for flocculation and sedimentation, and then supernatant which reaches a set standard is discharged.

Description

technical field [0001] The invention relates to the technical field of waste liquid treatment, in particular to a treatment method for nitric acid-containing electroless nickel plating waste liquid, and the invention also provides a treatment system for nitric acid-containing electroless nickel plating waste liquid for realizing the method. Background technique [0002] Electroless nickel plating is widely used in the fields of aviation, aerospace, electronics, petrochemicals, machinery, textiles and automobiles due to its excellent corrosion resistance, wear resistance and uniformity of coating thickness. However, in the process of nickel plating, phosphite ions, sodium ions, sulfate ions, etc. will continue to accumulate, resulting in deterioration of the performance of the plating solution and a decrease in the quality of the coating. Generally, it will be scrapped after several cycles of use, resulting in waste electroless nickel plating. liquid. Electroless nickel plat...

AI Technical Summary

Problems solved by technology

Wastewater treated by a single treatment method cannot meet the national first-level discharge standard (nickel ion concentration <0.1ppm), which will not only cause environmental pollution, but also cause waste of resources

At present, most of the literature on electroless nickel plating waste liquid is aimed at the separate treatment of nickel or phosphorus, and there are few comprehensive treatment of nickel and phosphorus. There is no literature related to the treatment of electroless nickel plating waste liquid containing nitric acid.

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