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A kind of electroless nickel plating aging solution treatment process

A technology of electroless nickel plating and treatment process, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve the problems of large oxidant consumption, secondary pollution, high price, etc., and achieve high nitrogen and phosphorus content. , protect the environment and achieve the effect of recycling

Active Publication Date: 2018-05-22
中新联科环境科技(安徽)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the recovery cost is high, especially the price of palladium chloride is expensive and not easy to recycle.
[0012] However, the above-mentioned treatment method will produce a large amount of sludge, cause secondary pollution, consume a large amount of oxidant, and have high operating costs, and the nickel recovery rate is 99%. Calculated on an average of 4000mg / L, the nickel content in wastewater is still as high as 40mg / L, which cannot meet the requirements. The current national emission limit <0.1mg / L requirement

Method used

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  • A kind of electroless nickel plating aging solution treatment process
  • A kind of electroless nickel plating aging solution treatment process
  • A kind of electroless nickel plating aging solution treatment process

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The electroless nickel plating aging solution (seeing table 1 for its composition list, wherein the nickel content is referring to table 2) is pumped in the heating reduction tank, adds 5mL / L in the described heating reduction tank simultaneously, 10% defoamer and 5.5g / L thiourea dioxide, heated by steam, after the temperature rises to 100°C, add 60g / L caustic soda for reduction reaction, the reaction temperature is 90°C, the pH value is 13, and the reaction time is 30min; Purify, add 3mL / L, 0.1% polyacrylamide after the reaction finishes, obtain nickel powder and filtrate through high-speed centrifugation, nickel powder reclaims, and filtrate (wherein the nickel content sees Table 2) carries out spray drying after adjusting the pH value to 6, obtains The residue belongs to general solid waste, outsourced treatment, to complete the treatment of the aging solution of electroless nickel plating.

Embodiment 2

[0046] The electroless nickel plating aging solution (see Table 1 for its composition list, wherein the nickel content sees Table 2) is pumped into the heating reduction tank, while adding 10mL / L defoamer and 6.5g / L thiourea dioxide in the heating reduction tank , using steam heating, after the temperature rises to 70°C, add 70g / L caustic soda to carry out the reduction reaction, the reaction temperature is 80°C, the pH value is 12, and the reaction time is 20min; the ammonia gas generated during the reaction is purified through the ammonia gas absorption tower, and the reaction After finishing, add 1mL / L, 0.1% polyacrylamide, obtain nickel powder and filtrate through high-speed centrifugation, nickel powder reclaims, and filtrate (wherein nickel content sees Table 2) carries out spray drying after adjusting pH value to 5, and the residue obtained belongs to General solid waste is outsourced to complete the treatment of the electroless nickel plating aging solution.

Embodiment 3

[0048] The electroless nickel plating aging solution (seeing Table 1 for its composition list, wherein the nickel content is referring to Table 2) is pumped in the heating reduction tank, while adding 15mL / L defoamer and 6g / L thiourea dioxide in the heating reduction tank, Heating with steam, after the temperature rises to 90°C, add 65g / L caustic soda for reduction reaction, the reaction temperature is 70°C, the pH value is 14, and the reaction time is 25min; the ammonia gas generated during the reaction is purified through the ammonia gas absorption tower, and the reaction ends Then add 2mL / L, 0.1% polyacrylamide, obtain nickel powder and filtrate through high-speed centrifugation, nickel powder is recovered, and the filtrate (wherein the nickel content is shown in Table 2) is spray-dried after adjusting the pH value to 5, and the residue obtained is general Solid waste is outsourced to complete the treatment of the electroless nickel plating aging solution.

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Abstract

The invention provides a process for treating chemical nickel-plating ageing solution. The process comprises the following steps: simultaneously adding an antifoaming agent and a reducing agent to a heating reduction tank, adopting steam heating; when the temperature rises to 70-100 DEG C, adding caustic soda flakes to perform a reduction reaction, making the reaction temperature be 70-100 DEG C, making the pH be 12-14, and making the reaction time be 20-30 min; purifying ammonia generated in the reaction process through an ammonia absorption tower, adding polyacrylamide after the reaction is ended, obtaining nickel powder and filtrate through high-speed centrifugation, recycling the nickel powder, adjusting the pH of the filtrate to 5-6 and then performing spraying drying, wherein obtained residue belongs to ordinary solid waste, performing outsourcing processing, and finishing treatment of the chemical nickel-plating ageing solution. The nickel concentration of the process filtrate is measured to be smaller than 5 mg / L, acid is added to regulate the PH of the filtrate to the suitable conditions to perform spraying drying, the dried residue undergoes outsourcing treatment, and the whole process is free of waste water discharge.

Description

technical field [0001] The invention relates to a treatment process of an electroless plating solution, in particular to a treatment process of an electroless nickel plating aging solution. Background technique [0002] Electroless nickel plating is the fastest growing type of electroless plating. It is a method of depositing a layer of nickel on the surface of metal parts by oxidation-reduction without external current. Used to improve corrosion and abrasion resistance, increase gloss and aesthetics. Bright nickel plating suitable for tubular or small parts with complex shapes without further polishing. Generally, the parts to be plated are immersed in a mixed solution made of nickel sulfate, sodium dihydrogen hypophosphite, sodium acetate and boric acid, and changes occur at a certain acidity and temperature, and the nickel ions in the solution are reduced by sodium dihydrogen hypophosphite It is deposited on the surface of the workpiece for atoms, forming a fine and br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24C23C18/36
Inventor 吴文明王婷婷
Owner 中新联科环境科技(安徽)有限公司
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