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Method for preparing NiP micron particles from chemical nickel plating waste liquid through electrolysis

A technology of electroless nickel plating and micron particles, applied in electrolytic components, electrolytic processes, electrodes, etc., can solve the problems of low added value of waste liquid recovery products, low electrolytic current efficiency, easy pollution of filter membranes, etc., and achieve ion concentration and organic matter The effect of reducing the content, simplifying the stripping process and increasing economic benefits

Active Publication Date: 2022-02-11
UNIV OF SCI & TECH BEIJING
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  • Description
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Problems solved by technology

The circulation of the nanofiltration membrane concentrated solution back to the electrochemical treatment cell can also improve the current efficiency of electrochemical treatment, which solves the problem of difficult recovery of valuable elements in the current waste liquid treatment process, low added value of waste liquid recovery products, low electrolytic current efficiency, and filter membrane Disadvantages such as easy pollution and scaling, and high processing costs

Method used

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  • Method for preparing NiP micron particles from chemical nickel plating waste liquid through electrolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The electroless nickel plating waste solution from a surface treatment company in Hebei was used, and the concentration of nickel ions in the waste solution was 11.7g / L (0.2mol / L). After adding 10L of waste liquid into the adjustment tank, add dilute sulfuric acid to adjust the pH to 1. Add 1320g of ammonium sulfate to the waste liquid and stir to obtain the pretreatment waste liquid whose molar mass concentration of ammonium ion is 2mol / L. The pretreated waste liquid is pumped into the water inlet of the electrochemical treatment tank, and after the waste liquid flows from the water inlet to the water outlet of the electrochemical treatment tank, the DC power supply is turned on, and the electrolytic current density of the cathode plate is set to -2A cm -2 . The waste liquid after cathodic electrolytic treatment enters the tubular ultrafiltration membrane with a filtration operating pressure of 0.5Mpa through the water outlet for filtration. The effluent from the ult...

Embodiment 2

[0045] Change the ammonium sulfate in the embodiment into 132g, and all the other remain unchanged. Then turn on the DC power supply to treat the waste liquid for 30 minutes, and the concentration of phosphite in terms of P element is 201g / L>200g / L. Until white calcium phosphite precipitates out in the solution, no particles are produced by electrolysis on the cathode graphite plate, and no black NiP micron particles appear on the bottom of the cathode mechanism.

Embodiment 3

[0047] The electroless nickel plating waste solution from a surface treatment company in Hebei was used, and the concentration of nickel ions in the waste solution was 11.7g / L (0.2mol / L). After adding 10L waste liquid into the adjustment tank, add dilute sulfuric acid to adjust the pH to 3.5. All the other are the same as in Example 1, and after turning on the DC power supply to treat the waste liquid for 35 minutes, the concentration of phosphite in terms of P element is 202g / L>200g / L. Black NiP micron particles were collected from the bottom of the cathode mechanism, but the amount of the particles was significantly smaller than in Example 1, and there were some black particles produced by electrolysis on the cathode graphite plate. The quality of the effluent after filtration by the roll-type nanofiltration membrane meets the requirements in Table 3 of my country's current electroplating pollutant discharge standard (GB21900-2008): total nickel≤0.1mg / L, total phosphorus≤1mg...

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Abstract

The invention relates to the technical field of NiP micron particle extraction, in particular to a method for preparing NiP micron particles from chemical nickel plating waste liquid through electrolysis. The method comprises the following steps: S1, adding dilute sulfuric acid into the chemical nickel plating waste liquid in an adjusting tank to adjust the pH value to be less than 4; S2, adding ammonium sulfate into the solution obtained in the previous step, and stirring to obtain pretreated waste liquid with the ammonium ion concentration greater than 0.5 mol / L; S3, adding the pretreated waste liquid into an electrochemical treatment tank; S4, filtering the treatment fluid in the step S3 through a tubular ultra-filtration membrane; S5, performing filtration and concentration treatment on the treatment liquid in the step S4 through a roll-type nano-filtration membrane; and S6, adding the concentrated solution obtained in the previous step into the electrochemical treatment tank again for circular treatment. The method mainly solves the problems that it is difficult to directly electrolyze and efficiently extract NiP micron particles from the chemical nickel plating waste liquid, and the electrolytic current efficiency is low. The method is mainly used for treating and purifying the chemical nickel plating waste liquid and preparing the NiP micron particles.

Description

technical field [0001] The invention relates to the technical field of extracting NiP micron particles, and more specifically, relates to a method for electrolytically preparing NiP micron particles from electroless nickel plating waste liquid. Background technique [0002] With the improvement of the quality requirements and demand for the surface coating of materials in modern industry, the scale of the electroless nickel plating industry has grown rapidly, and the composition of the plating solution has become more and more complex, resulting in a large amount of waste electroless nickel plating solution containing complex pollutant components. The pollutant components of electroless nickel plating waste liquid mainly include nickel salt, phosphorus-containing inorganic salt and organic matter. Among them, nickel salt is mainly incompletely consumed nickel sulfate; phosphorus-containing inorganic salt is mainly oxidation products such as unreacted sodium hypophosphite red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/01C25B1/50C25B11/043
CPCC25B1/01C25B1/50C25B11/043
Inventor 于湘涛侯玥袁章福
Owner UNIV OF SCI & TECH BEIJING
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