Method for electrolytically preparing bright nickel in alkaline electrolyte

An electrolyte and bright nickel technology, applied in the field of non-ferrous metallurgy, can solve the problems of nickel blackening and brittleness, achieve good toughness, simple process flow, and meet industrial needs

Inactive Publication Date: 2017-01-04
YIWU SCI & TECH INST CO LTD OF ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to address the shortcomings of the existing boric acid system and the problem that nickel is blackened and brittle by electrolysis of nickel-ammonia complexed alkaline system, and proposes a method for preparing bright nickel by electrolysis of high matte nickel in alkaline system. Adding an appropriate amount of sodium benzenesulfinate to the alkaline system can effectively solve the problem of black and brittle deposited nickel layer, and successfully prepare bright nickel. This method has the advantages of high current efficiency, bright nickel, and good toughness.

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  • Method for electrolytically preparing bright nickel in alkaline electrolyte

Examples

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Embodiment 1

[0037] Configure the anode chamber electrolyte containing 30g / L of ammonium chloride. Take the high-matte nickel electrode as the anode, soak it in 1mol / L nitric acid for 50 minutes to remove the surface oxide layer and impurities, take it out, rinse it with deionized water, and dry it with cold wind. Using stainless steel as the cathode material, after grinding with 1#, 3#, and 5# sandpaper, degreasing with absolute ethanol, washing with deionized water and drying with cold air, put the cathode and anode into the cathode and anode chambers of the electrolytic cell at the same time. Pour the electrolytic solution containing 20g / L nickel chloride, 30g / L ammonium chloride, 25g / L ammonia water, and 0.02g / L sodium benzenesulfinate into the chamber, control the electrodeposition temperature to 20°C, and the current density to -50A / m 2 , Stir the electrolyte at a speed of 700r / min. After 1 hour of electrodeposition, take out the cathode, rinse the residual electrolyte on the surfa...

Embodiment 2

[0041] Configure the anode compartment electrolyte containing 300g / L of ammonium chloride. Take the high-matte nickel electrode as the anode, soak it in 5mol / L nitric acid for 15min to remove the surface oxide layer and impurities, take it out, rinse it with deionized water, and dry it with cold wind. Using stainless steel as the cathode material, after grinding with 1#, 3#, 5# sandpaper, degreasing with absolute ethanol, washing with deionized water and drying with cold air, put the cathode and anode into the cathode and anode of the electrolytic cell at the same time, and pour the cathode chamber into Electrolyte containing 400g / L of nickel chloride, 300g / L of ammonium chloride, 250g / L of ammonia water, and 1.5g / L of sodium benzenesulfinate, controlled electrodeposition temperature to 70°C, and current density to -400A / m 2 , Stir the electrolyte at a speed of 300r / min. After 50 hours of electrodeposition, take out the cathode, rinse the residual electrolyte on the surface wi...

Embodiment 3

[0045] Configure the anode compartment electrolyte containing 50g / L of ammonium chloride. Take the high-matte nickel electrode as the anode, soak it in 2mol / L nitric acid for 35min to remove the surface oxide layer and impurities, take it out, rinse it with deionized water, and dry it with cold wind. Using stainless steel as the cathode material, after grinding with 1#, 3#, 5# sandpaper, degreasing with absolute ethanol, washing with deionized water and drying with cold air, put the cathode and anode into the cathode and anode of the electrolytic cell at the same time, and pour the cathode chamber into Electrolyte containing 100g / L of nickel chloride, 80g / L of ammonium chloride, 60g / L of ammonia water, and 0.05g / L of sodium benzenesulfinate. Control the electrodeposition temperature at 40°C and the current density at -100A / m 2 , Stir the electrolyte at a speed of 400r / min. After 1 hour of electrodeposition, take out the cathode, rinse the residual electrolyte on the surface wi...

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Abstract

The invention relates to a method for electrolytically preparing bright nickel in alkaline electrolyte. The method comprises the following steps: (1) an electrobath comprises a cathode chamber and an anode chamber, high-grade nickel matte is immersed in 1 to 5mol / L nitric acid for 15 to 50 minutes to remove the surface oxide layer and impurities, a cathode material is electrodeposited to remove the surface oxide layer and deoiled, and the previously treated high-grade nickel matte and cathode material are respectively placed into the cathode chamber and the anode chamber; the electrolyte of the anode chamber is aqueous ammonium chloride solution, the ammonium chloride concentration of which ranges from 30g / L to 300g / L; the electrolyte of the cathode chamber is purified high-grade nickel matteanolyte, wherein the concentration of nickel chloride content ranges from 20g / L to 400g / L, the concentration of ammonium chloride ranges from 30g / L to 300g / L, the concentration of ammonia ranges from 25g / L to 250g / L, and the concentration of sodium benzenesulfinate ranges from 0.02g / L to 1.5g / L; (2) electrodeposition is carried out in the electrobath, the cathode is taken out after electrodeposition is complete, washed with deionized water and dried by cold wind, and thereby a bright and smooth nickel layer is obtained.

Description

[0001] (1) Technical field [0002] The invention relates to a method for electrolytically preparing bright nickel in an alkaline electrolyte, belonging to the technical field of nonferrous metallurgy. [0003] (2) Background technology [0004] In the current electrolytic industrial production of nickel, the bright nickel is mainly prepared by electrolysis with the Watts nickel plating solution of the boric acid system. This process has been continuously improved and matured after decades of transformation and innovation. The progress of the traditional electrolytic nickel process is increasingly revealing its shortcomings in production. The disadvantages of the traditional electrolytic nickel process are as follows: [0005] 1. Using acidic system electrolytic nickel process, using boric acid as a buffer, it is necessary to strictly control the pH within the range of 4.5 to 5.4. If the pH is too low, the efficiency of the cathode will decrease, and if the pH is too high, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/12
CPCC25D3/12
Inventor 伍廉奎郑国渠曹华珍
Owner YIWU SCI & TECH INST CO LTD OF ZHEJIANG UNIV OF TECH
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