Regeneration treatment method of chemical nickel plating solution

Abstract

The invention discloses a regeneration treatment method of an chemical nickel plating solution. The chemical nickel plating solution is contained into a reserved tank and then injected into a regeneration tank, a calcium hypophosphite solution is then added into the regeneration tank, stirring, standing and filtering are carried out to obtain first supernatant and first sediment, the first supernatant is reserved for later use, then the first sediment is washed, and a cleaning solution is collected and incorporated into the first supernatant; the calcium hypophosphite solution is added into the first supernatant, stirring, standing and filtering are carried out to obtain second supernatant and second sediment, then the second sediment is washed, a cleaning solution is collected and incorporated into the second supernatant, and the second supernatant is a regenerated chemical nickel plating crude solution; and nickel sulfate and sodium hypophosphite are added into the regenerated chemical nickel plating crude solution to obtain the regenerated chemical nickel plating solution. By means of the method, harmful ions including sulfate radicals and phosphite radicals are effectively removed, high-value substances such as nickel ions and hypophosphite ions are recovered, and recycling regeneration of a chemical nickel plating aging solution is realized.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and in particular relates to a regeneration treatment method of an electroless nickel plating solution. Background technique [0002] Electroless nickel plating is a Ni-P amorphous coating formed by the reaction of nickel salt and hypophosphite. It has the advantages of no external power supply, uniform coating, high hardness, good wear resistance, and no size and shape restrictions on plated parts. It is widely used In the field of surface treatment technology for electronics, chemicals, machinery and other products. But be nickel source with nickel sulfate hexahydrate, sodium hypophosphite is the electroless nickel plating solution of reductant in the plating process, can accumulate phosphite radical, sulfate radical and sodium ion constantly in the plating solution, cause plating solution aging, make The deposition rate of electroless nickel plating decreases, and causes the perform...

AI Technical Summary

Problems solved by technology

However, due to the high concentration of phosphite in the electroless nickel plating waste solution and the limited exchange capacity of the resin, the treatment capacity of the ion exchange resin is small and the regeneration cycle of the resin is frequent, which brings certain troubles to the operation and management; Moreover, the operation of the ion exchange method is complicated. When the active groups with exchange ions in some anion exchange resins exchange with the phosphite, the ions after self-exchange will be introduced into the solution, which may cause secondary pollution to the plating solution, so that the subsequent Moreover, the eluent and washing water produced during the treatment process contain a small amount of nickel, and these wastewaters need further treatment, 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. high

[0006] In summary, the recycling methods of these aging liquids have their own shortcomings. At present, there is no low-cost, low-energy, simple and easy treatment process. The existing technology cannot obviously remove harmful ions sulfate and phosphite. , and recover high-value substances such as nickel ions and hypophosphite ions to realize the recycling of electroless nickel plating aging solution