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Method for recycling nickel, buffer salt and water from chemical nickel-plating ageing solution

A technology of electroless nickel plating and aging solution, applied in chemical instruments and methods, liquid chemical plating, inorganic chemistry, etc., can solve environmental pollution and other problems, and achieve the effect of reducing pollution

Active Publication Date: 2017-06-13
生态环境部华南环境科学研究所(生态环境部生态环境应急研究所)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrochemical treatment can effectively recover nickel in electroplating wastewater, but the wastewater still contains a large amount of salt, and direct discharge without treatment will cause environmental pollution. In addition, these salts are still a resource that should be recycled

Method used

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  • Method for recycling nickel, buffer salt and water from chemical nickel-plating ageing solution

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Effect test

Embodiment 1

[0023] A method for reclaiming nickel, buffer salt and water from electroless nickel plating aging solution, comprising the following steps:

[0024] 1) Filter the aging solution through a filter, the filter aperture of the security filter is 0.5um, and the water inlet flow rate is 2.5m 3 / h, the security filter also includes a reverse osmosis flushing system, which automatically flushes once every 4 hours, the flushing time is 30s, and the hydraulic flushing flow rate is 8m 3 / h;

[0025] 2) The electroless nickel plating aging solution is electrolytically treated by an electrolytic cell. The electrolytic cell uses nickel foam as the cathode and a titanium-ruthenium mesh electrode as the anode. The reaction voltage is 20V, the current is 15A, and the reaction time is 1 hour. The electrolytic method can Ni in aging solution 2+ The ion concentration is reduced from 2g / L to 50mg / L; the organic matter and complexing agent in the aging solution are oxidized and broken at the ano...

Embodiment 2

[0031] A method for reclaiming nickel, buffer salt and water from electroless nickel plating aging solution, comprising the following steps:

[0032] 1) Filter the aging solution through a filter, the filter aperture of the security filter is 2um, and the water inlet flow rate is 3.7m 3 / h, the security filter also includes a reverse osmosis flushing system, which automatically flushes once every 4 hours, the flushing time is 30s, and the hydraulic flushing flow rate is 8m 3 / h;

[0033]2) The electroless nickel plating aging solution is electrolytically treated by an electrolytic cell. The electrolytic cell uses nickel foam as a cathode and a titanium-ruthenium mesh electrode as an anode. The reaction voltage is 85V, the current is 42A, and the reaction time is 1.5 hours. The electrolytic method can Ni in aging solution 2+ The ion concentration is reduced from 2g / L to 50mg / L; the organic matter and complexing agent in the aging solution are oxidized and broken at the anode ...

Embodiment 3

[0039] A method for reclaiming nickel, buffer salt and water from electroless nickel plating aging solution, comprising the following steps:

[0040] 1) Filter the aging solution through a filter, the filter aperture of the security filter is 3.5um, and the water flow rate is 5m 3 / h, the security filter also includes a reverse osmosis flushing system, which automatically flushes once every 4 hours, the flushing time is 30s, and the hydraulic flushing flow rate is 8m 3 / h;

[0041] 2) The electroless nickel plating aging solution is electrolytically treated by an electrolytic cell. The electrolytic cell uses nickel foam as a cathode and a titanium-ruthenium mesh electrode as an anode. The reaction voltage is 150V, the current is 70A, and the reaction time is 2 hours. The electrolytic method can Ni in aging solution 2+ The ion concentration is reduced from 2g / L to 50mg / L; the organic matter and complexing agent in the aging solution are oxidized and broken at the anode to rem...

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Abstract

The invention discloses a method for recycling nickel, buffer salt and water from chemical nickel-plating ageing solution. The method comprises the following steps: 1) filtering the ageing solution by virtue of a filter; 2) carrying out electrolysis treatment on the chemical nickel-plating ageing solution; 3) heating the ageing solution by utilizing a heat exchanger, enabling the ageing solution to enter a low temperature vacuum evaporation concentrator to be evaporated and concentrated, so that phosphate and sulfate are crystallized; 4) enabling condensation water to sequentially pass through a reverse osmosis membrane, an ion exchange filter and a porous medium adsorption filter to be filtered and recycled as production water supply; and 5) enabling mixed liquor after crystallization to enter a crystallization fluidized bed to be separated, so that mixed crystals of sulfate and phosphate are obtained, removing crystal salt particles in effluent by virtue of a security filter, then recycling to an electrolytic tank, and carrying out secondary recycling on residual nickel. The method disclosed by the invention can realize complete recycling of metal nickel, dissolved salt and water in the chemical nickel-plating ageing solution, and pollution of electroplating ageing solution to the environment is reduced to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of electroplating wastewater treatment and resource recovery, in particular to a method for recovering nickel, buffer salt and water from electroless nickel plating aging solution. Background technique [0002] Nickel is a silver-white yellowish metal with ferromagnetism. When nickel and oxygen interact in the air, a passivation film is formed on the surface quickly, which can resist the corrosion of the atmosphere, alkali and some acids. Nickel-plated products are widely used in the protection of magnetic materials, precision electronic devices, automatic control parts, mobile phone parts, mechanical parts and automobile parts. Electroless nickel plating is a method of obtaining a nickel alloy coating on the surface of a material through a self-catalyzed reaction in a solution added with a metal salt and a reducing agent. The electroless nickel plating process using hypophosphite as reducing agent has been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C25C1/08C23C18/16C01B25/26C01B17/96C02F101/20C02F101/30C02F103/16
CPCC01B17/96C01B25/265C02F1/001C02F1/043C02F1/28C02F1/42C02F1/441C02F1/4672C02F1/4678C02F9/00C02F2101/20C02F2101/303C02F2103/16C02F2209/02C02F2209/03C02F2303/16C23C18/1617C25C1/08
Inventor 杜建伟张明杨温勇贺框马英
Owner 生态环境部华南环境科学研究所(生态环境部生态环境应急研究所)
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