A kind of secondary utilization method of nickel plating waste liquid

Abstract

The invention discloses a secondary utilization method of nickel plating waste liquid. According to the secondary utilization method, 20 to 30% of an acidic waste liquid recycling agent is added into a used acidic nickel plating waste liquid, wherein the acidic waste liquid recycling agent is prepared from nickel sulfate, sodium hypophosphate, sodium acetate, and water; or 20 to 30% of an alkaline waste liquid recycling agent is added into a used alkaline nickel plating waste liquid, wherein the alkaline waste liquid recycling agent is prepared from nickel chloride, ammonium chloride, ammonium citrate tribasic, sodium hypophosphate, and water; so that the nickel plating waste liquid can be recycled, and can be used as plating liquid for a second time. According to the secondary utilization method, the nickel plating waste liquid is recycled by adding the waste liquid recycling agent, and abandoning of the used waste liquid residue is not necessary, so that resource waste is avoided, waste water treatment cost is reduced, and excellent beneficial effects are achieved.

Description

technical field [0001] The invention relates to a secondary utilization method of nickel plating waste liquid, belonging to the technical field of semiconductor nickel plating. Background technique [0002] In semiconductor production, it is necessary to plate nickel on the surface of the silicon wafer as a solder sintered between the die and the electrode in order to form a good ohmic contact with the silicon. There are generally two commonly used nickel plating methods, one is acid nickel plating, and the other is alkaline plating solution. [0003] At present, no matter whether acidic nickel plating or alkaline plating solution is used, the plating solution is only used once, and the remaining waste plating solution is poured out. These remaining waste plating solutions contain harmful substances, and cannot be directly discharged according to environmental protection requirements. For rivers and rivers, it takes a lot of manpower and material resources to process and me...

AI Technical Summary

Problems solved by technology

[0003] At present, no matter whether acidic nickel plating or alkaline plating solution is used, the plating solution is only used once, and the remaining waste plating solution is poured out. The plating solution contains harmful substances, which cannot be directly discharged into rivers according to environmental protection requirements. It takes a lot of manpower and material resources to process and meet environmental protection requirements before it can be discharged. This not only causes waste of resources, but also increases the cost of sewage treatment.