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Method for recovering nickel in chemical nickel-plating ageing liquid

A technology of electroless nickel plating and recovery method, which is applied in optics, photographic technology, instruments, etc., can solve the problems that the cathode material porous nickel foam is expensive, cannot fully realize resource recovery and reuse, and increase production costs, etc. The effects of popularization and application, elimination of pinhole phenomenon, and reduction of production cost

Active Publication Date: 2011-10-12
WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has great disadvantages: (1) the cathode material porous nickel foam is expensive, which is not conducive to industrial production; (2) the reaction temperature is too high, which increases the production cost and complicates the production process; (3) the nickel recovery rate is not high ; (4) The electrolytic wastewater needs subsequent reprocessing, which not only increases the production cost, but also cannot fully realize the recycling and reuse of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add 1100g of electroless nickel plating aging solution into the electrolytic cell, and adjust the pH value of the electroless nickel plating aging solution to 8.0 with flake sodium hydroxide;

[0023] (2) Dissolve 10mg of polyethylene glycol 6000, 10mg of 2-mercaptobenzimidazole, 30mg of thiourea, 5mg of hide glue, and 300mg of sodium hypophosphite in 40g of water, add the aqueous solution to the electrolytic cell, and then add 1.3g 5mol / L hydrochloric acid solution, stir evenly;

[0024] (3) At room temperature, use a stainless steel plate as the cathode, and an iridium dioxide-plated titanium alloy mesh plate as the anode, control the reaction current to be constant at 0.6A, and react for 8 hours to obtain recovered metal nickel on the cathode.

Embodiment 2

[0026] (1) Add 1200g of electroless nickel plating aging solution into the electrolytic cell, and adjust the pH value of the electroless nickel plating aging solution to 9.0 with flake sodium hydroxide;

[0027] (2) Dissolve 15mg of polyethylene glycol 6000, 15mg of 2-mercaptobenzimidazole, 45mg of thiourea, 10mg of hide glue, and 380mg of sodium hypophosphite in 50g of water, add the aqueous solution to the electrolytic cell, and then add 2.6g 5mol / L hydrochloric acid solution, stir evenly;

[0028] (3) At room temperature, use a stainless steel plate as the cathode, and an iridium dioxide-plated titanium alloy mesh plate as the anode, control the reaction current to be constant at 0.9A, and react for 8.5 hours to obtain recovered metal nickel on the cathode.

Embodiment 3

[0030] (1) Add 1300g of electroless nickel plating aging solution into the electrolytic cell, and adjust the pH value of the electroless nickel plating aging solution to 10.0 with flake sodium hydroxide;

[0031] (2) Dissolve 27mg of polyethylene glycol 6000, 20mg of 2-mercaptobenzimidazole, 59mg of thiourea, 29mg of hide glue, and 490mg of sodium hypophosphite in 60g of water, add the aqueous solution to the electrolytic cell, and then add 3g of 5mol / L hydrochloric acid solution, stir evenly;

[0032] (3) At room temperature, use a stainless steel plate as the cathode, and an iridium dioxide-plated titanium alloy mesh plate as the anode, control the reaction current to be constant at 1.0A, and react for 9 hours to obtain recovered metal nickel on the cathode.

[0033] In Examples 1 to 3, see Table 1 for the comparison of nickel content in the electroless nickel plating aging solution before and after electrolysis.

[0034] Table 1

[0035] As can be seen from Table 1, t...

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Abstract

The invention discloses a method for recovering nickel in a chemical nickel-plating ageing liquid, and the method comprises the following steps: (1) adding 1100-1300 parts by weight of the chemical nickel-plating ageing liquid into an electrolytic cell, and regulating the pH value of the ageing liquid to 8-10 by use of solid sodium hydroxide; (2) dissolving 0.01-0.03 part by weight of polyethylene glycol, 0.01-0.02 part by weight of 2-mercapto benzimidazole, 0.03-0.06 part by weight of thiourea, 0.005-0.03 part by weight of hide glue and 0.3-0.5 part by weight of sodium hypophosphite into 40-70 parts by weight of water, adding the mixture into the electrolytic cell, and adding 1-3 parts by weight of 5mol / L hydrochloric acid solution; (3) at normal temperature, on the basis of taking a stainless steel plate as a cathode and a reticular plate plated with iridium oxide titanium alloy as an anode, reacting for 8-10 hours at constant reaction current of 0.6-1.0A, thus obtaining a recoveredmetal nickel on the cathode. The method has the advantages of high recovery rate, simple equipment, low cost and the like, works at normal temperature and is easy to realize.

Description

technical field [0001] The invention relates to a metal recovery method in an electroless plating solution, in particular to a method for recovering nickel in an electroless nickel plating aging solution. Background technique [0002] Electroless nickel plating is the fastest-growing type of electroless plating. It has been widely studied and applied for its outstanding advantages in uniformity, corrosion resistance, hardness, and weldability. The plating solution generally uses nickel sulfate, nickel acetate, nickel sulfamate as the main salt, sodium borohydride, borane, etc. as the reducing agent, and various additives are added. , Alkaline solution for operation. However, after long-term use of the plating solution, the performance will drop sharply, such as pinholes in the plating layer, turbidity and aging of the plating solution, etc. At this time, the aging plating solution also contains a large amount of nickel, and most of the nickel exists in a complex state, mak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/08
Inventor 张义根
Owner WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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