A kind of nickel plating aging solution prepares the method for metal nickel sulfate, sodium dihydrogen phosphate and sodium sulfate

A technology of sodium dihydrogen phosphate and aging solution, which is applied in the fields of alkali metal sulfite/sulfite, chemical instruments and methods, nickel sulfate, etc., and can solve problems such as use risks

Active Publication Date: 2017-07-25
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 can extend the service life of the nickel plating solution to a certain extent, but there is a risk of using the nickel plating solution when it is returned to the production line

Method used

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  • A kind of nickel plating aging solution prepares the method for metal nickel sulfate, sodium dihydrogen phosphate and sodium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 1000mL of electroless nickel plating aging solution from the production line of a PCB manufacturer, add caustic soda to adjust pH=8, exothermic temperature rises to 80°C during the process, and keep it warm for 80min to obtain solution A; solution A is stirred, and the final concentration is 0.5wt% Activated carbon powder, metal nickel powder and solution B will be obtained, and 2g of metal nickel powder will be obtained by filtration; and 1% hydrogen peroxide will be added, after dissolution is complete, filtered, concentrated and crystallized to obtain 0.5g of nickel sulfate product; in solution B, add persulfuric acid 10g, stirred for 30 minutes, the remaining sodium dihydrogen phosphite and sodium dihydrogen hypophosphite in the aging solution can be converted into sodium dihydrogen phosphate, which is solution C; add concentrated phosphoric acid to solution C to adjust pH=4 , to obtain solution D; solution D is evaporated and crystallized at a controlled temper...

Embodiment 2

[0028] Take 1000mL of electroless nickel plating aging solution from the production line of a PCB manufacturer, add caustic soda to adjust pH=10, exothermic temperature rises to 90°C during the process, and keep warm for 60min to obtain solution A; solution A is stirred, and the final concentration is 0.1wt% Activated carbon powder, metal nickel powder and solution B will be obtained, and 3g of metal nickel powder will be obtained by filtration; and 3% hydrogen peroxide will be added, after dissolution is complete, filtered, concentrated and crystallized to obtain 1g of nickel sulfate product; in solution B, add 20g of persulfuric acid , stirred for 30 minutes, the residual sodium dihydrogen phosphite and sodium dihydrogen hypophosphite in the aging solution can be converted into sodium dihydrogen phosphate, which is solution C; add concentrated phosphoric acid to solution C to adjust pH=3, Obtain solution D; solution D is evaporated and crystallized, and the temperature is con...

Embodiment 3

[0030] Take 1000mL of electroless nickel plating aging solution from the production line of a PCB manufacturer, add caustic soda to adjust pH=11, exothermic temperature rises to 100°C during the process, and keep it warm for 50min to obtain solution A; solution A is stirred, and added with final concentration of 1wt% Activated carbon powder, metal nickel powder and solution B will be obtained, and 2g of metal nickel powder will be obtained by filtration; and 5% hydrogen peroxide will be added, after dissolution is complete, filtered, concentrated and crystallized to obtain 4g of nickel sulfate product; add iodine 15g to solution B, stir In 30 minutes, the residual sodium dihydrogen phosphite and sodium dihydrogen hypophosphite in the aging solution can be converted into sodium dihydrogen phosphate, which is solution C; add concentrated phosphoric acid to solution C, adjust pH = 5, and obtain a solution D; Evaporation and crystallization of solution D is carried out at a tempera...

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Abstract

The invention provides a method for preparing metal nickel sulfate, sodium dihydrogen phosphate and sodium sulfate by using a nickel plating aging liquid. The method comprises: (1) adjusting the pH value of a nickel plating aging liquid by using an alkali, and carrying out thermal insulation to obtain a solution A; (2) stirring the solution A, adding a catalyst, and filtering to obtain metal nickel powder and a solution B; (3) adding sulfuric acid to the metal nickel powder to dissolve, adding hydrogen peroxide, and carrying out filtration concentration crystallization to obtain the nickel sulfate product; (4) adding an oxidizing agent to the solution B to obtain a solution C; (5) adding a concentrated acid to the solution C and adjusting the pH value to obtain a solution D; (6) evaporating and crystallizing the solution D, and filtering to obtain the sodium sulfate product and a solution E; and (7) continuously concentrating the solution E, carrying out cooling crystallization, and filtering to obtain the sodium dihydrogen phosphate product, wherein the mother liquor returns to the next batch so as to be continuously concentrated and used. According to the present invention, the treatment process is easy to achieve, no secondary waste is produced, the three products such as nickel sulfate, sodium dihydrogen phosphate and sodium sulfate can be obtained at the same time, and the good economic benefits and the good environmental benefits are provided.

Description

technical field [0001] The invention relates to the technical field of nickel plating aging solution recovery, in particular to a method for preparing metal nickel sulfate, sodium dihydrogen phosphate and sodium sulfate through recovery of nickel plating aging solution. Background technique [0002] Both PCB production and plastic plating industry are inseparable from the electroless nickel plating process, because electroless nickel plating has excellent characteristics such as uniform coating, high surface hardness, and corrosion resistance. During the use of the electroless nickel plating solution, nickel ions will be continuously reduced and deposited from the solution under the action of the reducing agent sodium dihydrogen phosphite, so nickel salt and reducing agent must be continuously added during the process to maintain the electroless nickel plating The stable deposition rate of the liquid. Due to the addition of reagents during the nickel plating process and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/10C01B25/30C01D5/00
CPCC01B25/30C01D5/00C01G53/10
Inventor 万园园方稳郎超张义根
Owner WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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