Resource utilization zero-emission recycling process method of chemical waste nickel liquid

Abstract

The invention discloses a resource utilization zero-emission recycling process method of a chemical waste nickel liquid. The resource utilization zero-emission recycling process method is characterized by comprising the following steps: I, concentrating and separating the chemical waste nickel liquid, namely, adjusting the pH value of the chemical waste nickel liquid to be 3-5, performing low-temperature negative pressure evaporation concentration, and rising the temperature to 95-110 DEG C, wherein the negative pressure condition is minus 0.09 - minus 0.1MPa and the boiling temperature is not greater than 70 DEG C; II, separating sodium sulfate by an acid solution, namely, performing slow soaking dissolution on chemical nickel residues by a sulfuric acid solution in stirring so as to obtain a sulfuric acid leaching agent; after sufficient cooling, and performing filtration to obtain filtrate and sodium sulfate crystal; III, extracting and separating nickel sulfate, namely, adding ethanol into the filtrate, leaving to stand to layer, and performing solid-separation separation so as to obtain nickel sulfate solid for resource recycling and reuse; IV, recycling ethanol. By adopting the resource utilization zero-emission recycling process method disclosed by the invention, the chemical solid nickel waste can be completely recycled, the requirements of environment-friendliness of waste liquid recycling and zero emission are met indeed, and the required social environment capacity is greatly reduced.

Description

technical field [0001] The invention relates to a resource recovery process of chemical nickel waste liquid, in particular to a process method for resource recovery of chemical nickel waste liquid with zero discharge. Background technique [0002] The electroless nickel plating process technology is used in various industrial fields, especially the circuit board industry and The electroplating industry is widely used. However, with the continuous expansion of the application range and production scale of electroless nickel plating technology, the environmental problems are becoming more and more serious. [0003] In the actual production process, a redox reaction occurs in the plating tank, that is, nickel ions are reduced to metallic nickel, and hypophosphite is oxidized to phosphite. With the progress of electroless plating, nickel ions and hypophosphite are gradually consumed, and the by-product phosphite continues to accumulate. The plating speed is significantly slowe...

AI Technical Summary

Problems solved by technology

Due to high technical requirements, rising costs in all aspects, coupled with the decreasing capacity of the social environment, the qualifications of enterprises that dispose of such waste liquids are becoming more and more standardized, and the treatment costs are rising accordingly, which greatly increases the waste liquid treatment costs of enterprises. , causing a burden

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