Regeneration method of electroless nickel plating waste solution

A technology of electroless nickel plating and waste liquid, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve the problems of inability to remove phosphorous, difficult to actually produce, complicated process, etc., to reduce the risk The effect of waste discharge, full utilization, and simple process operation method

Active Publication Date: 2022-03-11
南通湛清环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) Other ions will be introduced and accumulated in large quantities;
[0006] 2) Phosphorus in the scrap bath cannot be removed;
[0007] 3) The process is complex and difficult to apply to actual production;
[0008] 4) The cost is too high

Method used

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  • Regeneration method of electroless nickel plating waste solution
  • Regeneration method of electroless nickel plating waste solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] For an electroless nickel plating solution, under the conditions of temperature 90°C and pH 4.8, the plating speed is 3min / μ in normal use, and after the 8th cycle, the plating speed drops to 7min / μ, and the phosphorous in the plating solution The content is higher than 60g / L, and the plating solution is in a serious aging state. At this time, other indicators of the plating solution are: nickel content 5.22g / L, hypophosphorous content 10.29g / L.

[0042] Perform regeneration treatment on this plating solution: add 300g / L phosphorous remover to it, adjust the pH to 4.5, stir for 2.5 hours, then precipitate and filter, crystallize the filtered clear solution at -5°C for 1.5 hours, filter Finally, the regenerated plating solution is obtained. At this time, the phosphorous in the plating solution has been reduced to below 1g / L, while the nickel content remains at 5.17g / L, and the hypophosphorus content remains at 9.89g / L. Add special supplement for electroless nickel plating...

Embodiment 2

[0044] For an electroless nickel plating solution, under the conditions of temperature 90°C and pH 4.8, the plating speed is 3min / μ in normal use, and after the 8th cycle, the plating speed drops to 7min / μ, and the phosphorous in the plating solution The content is higher than 60g / L, and the plating solution is in a serious aging state. At this time, other indicators of the plating solution are: nickel content 5.22g / L, hypophosphorous content 10.29g / L.

[0045] Perform regeneration treatment on this plating solution: add 120g / L phosphorous remover to it, adjust the pH to 2.9, stir for 2 hours, then precipitate and filter, crystallize the filtered supernatant at -4°C for 1 hour, filter Finally, the regenerated plating solution is obtained. At this time, the phosphorous in the plating solution has been reduced to below 30g / L, while the nickel content is maintained at 5.2g / L, and the hypophosphorous content is maintained at 10.02g / L. Add special supplement for electroless nickel p...

Embodiment 3

[0047] For an electroless nickel plating solution, under the conditions of temperature 90°C and pH 4.8, the plating speed is 3min / μ in normal use, and after the 8th cycle, the plating speed drops to 7min / μ, and the phosphorous in the plating solution The content is higher than 60g / L, and the plating solution is in a serious aging state. At this time, other indicators of the plating solution are: nickel content 5.22g / L, hypophosphorous content 10.29g / L.

[0048]Perform regeneration treatment on this plating solution: add 180g / L phosphorous remover to it, adjust the pH to 3.1, stir for 3 hours, then precipitate and filter, crystallize the filtered supernatant at -6°C for 2 hours, filter Finally, the regenerated plating solution is obtained. At this time, the phosphorous in the plating solution has been reduced to below 15g / L, while the nickel content is maintained at 5.21g / L, and the hypophosphorous content is maintained at 9.98g / L. Add special supplement for electroless nickel p...

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Abstract

The invention discloses a regeneration method of electroless nickel plating waste liquid. Firstly, a phosphorous removal agent with 2 to 6 times the phosphorus content in the waste liquid is added to the waste liquid, and then sulfuric acid is added to adjust the pH value of the waste liquid to 2.5 to 2.5. 4.5. The clear liquid is obtained after filtration, crystallized at a temperature of -2°C to -10°C, and can be regenerated after filtration and crystallization. The process operation method of the present invention is simple, has no special requirements for equipment, and can be applied to actual production In the process, online recycling can be realized to achieve the effect of continuous production without tank down, so that the chemical nickel plating raw materials can be fully utilized, the discharge of hazardous wastes can be reduced, and the cost of chemical nickel plating can be reduced.

Description

technical field [0001] The invention relates to the technical field of waste liquid treatment, in particular to a regeneration method for electroless nickel plating waste liquid. Background technique [0002] Compared with electroplating technology, electroless nickel plating does not require external current, the coating is uniform, has good wear resistance and high strength, and is widely used in the fields of automobile industry, electronics industry, precision machinery, aviation, shipbuilding, chemical industry, daily hardware, etc. . However, the service life of the existing electroless nickel plating solution is generally only 6 to 8 cycles, and the total phosphorus, COD, and heavy metals in the scrapped plating solution seriously exceed the standard, which makes the treatment difficult, which makes the cost of electroless nickel plating remain high and wastes resources. The situation is serious. In order to solve these problems, it is necessary to study the regener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/36
CPCC23C18/1617C23C18/36
Inventor 王磊周文慧刘振兴叶小兵周健
Owner 南通湛清环保科技有限公司
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