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Method for producing nickel powder from pure nickel sulfate solution through direct deposition

A technology of nickel sulfate and solution, which is applied in the field of direct electrodeposition production of nickel powder with pure nickel sulfate solution, which can solve the problems of high cost, high power consumption, complex process, etc., and achieve low production cost, fine product particle size, and simple process method Effect

Inactive Publication Date: 2011-03-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method must use pure electrolytic nickel plates as anodes and use additives to perform electrolysis. Therefore, the process is complicated, the cost is high, and the power consumption is large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 20L of nickel sulfate solution with a concentration of 8g / L, containing 0.0003g / L Cu, 0.0005g / L Fe, 0.0001g / L As, 0.0001g / L Sb, 0.00035g / L Bi, and 0.0003g / L Zn in the solution , Pb 0.00065g / L, H 2 SO 4 5-7g / L, add 10-15 grams of NaOH, adjust the pH value of the solution to 2.0, and then put it into an electrolytic cell, which is equipped with an inlet and outlet conduit for the electrolyte and a thermometer; the anode uses Pb- Ag-Ca alloy and cathode are stainless steel plates. Adjust the temperature of the solution to 20-30°C; the current density is 1000A / M 2 , the electrolyte circulation speed is 0.5-1L / min, the electrolysis time is 1.0 hours, and the powder is scraped at an interval of 30min / time; after the electrolysis is completed, the electrolytic nickel powder is obtained by normal pressure or reduced pressure filtration, and the electrolytic nickel powder is rinsed with water, with BaCl 2 Tested, to no BaSO 4 When the white precipitate is generated, st...

Embodiment 2

[0024] Take 20L of nickel sulfate solution with a concentration of 25g / L, containing Cu 0.0006g / L, Fe 0.0003g / L, Pb 0.00028g / L, Zn 0.0002g / L, As 0.0002g / L, Sb 0.0003g / L , Bi 0.0005g / L, add 25-35 grams of NaOH, adjust the pH value of the solution to 4.0, and put it into an electrolytic cell, which is equipped with an inlet and outlet conduit and a thermometer for the electrolyte; the anode uses Pb containing 1.2% silver -Ag-Ca alloy, the cathode is a stainless steel plate. Adjust the temperature of the solution to 35-45°C; the current density is 2500A / m 2 , the electrolyte circulation speed is 2-3L / min, the electrolysis time is 1.0 hours, and the powder is scraped at an interval of 30min / time; after the electrolysis is completed, the electrolytic nickel powder is obtained by normal pressure or reduced pressure filtration, and the electrolytic nickel powder is washed with clean water, with BaCl 2 Tested, to no BaSO 4 When the white precipitate is generated, stop flushing and ...

Embodiment 3

[0026] Take 20L of nickel sulfate solution with a concentration of 50g / L, containing Cu 0.0006g / L, Fe 0.0003g / L, Pb 0.00028g / L, Zn 0.0002g / L, As 0.0002g / L, Sb 0.0003g / L , Bi 0.0005g / L, add NaOH and Na 2 CO 3 40 to 50 grams of the mixture, adjust the pH value of the solution to 7.2, and put it into an electrolytic cell, which is equipped with an inlet and outlet conduit for the electrolyte and a thermometer; the anode uses a Pb-Ag-Ca alloy containing 1.5% silver, and the cathode For stainless steel plate. Adjust the temperature of the solution to 35-45°C; the current density is 4000A / m 2 , the electrolyte circulation speed is 4-5L / min, the electrolysis time is 1.0 hours, and the powder is scraped at an interval of 30min / time; after the electrolysis is completed, the electrolytic nickel powder is obtained by filtering under normal pressure or reduced pressure, and the electrolytic nickel powder is washed with clean water. with BaCl 2 Tested, to no BaSO 4 When the white prec...

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Abstract

The invention provides a method for producing nickel powder from pure nickel sulfate solution through direct deposition. The method comprises the following steps: adjusting the pH value of the pure nickel sulfate solution at a concentration more than 8g / L to between 2.0 and 7.2; and taking a Pb-Ag-Ca lead base alloy as an anode and a stainless steel plate as a cathode, performing electrolysis to deposit the nickel powder on the negative plate, wherein in the electrolysis, the current density is between 1,000 and 4,000A / M2, and the temperature of electrolyte solution is between 20 and 60DEG C.The granularity of the electrolytic nickel powder prepared by the method is less than 200 meshes, and the oxygen content is lower than 0.35 percent. The method has the advantages of simple process, short process flow, low production cost, energy efficiency and environmental protection, is suitable for directly preparing the electrolytic nickel powder from the pure nickel sulfate solution, is alsosuitable for directly preparing the electrolytic nickel powder from nickel solution recovered from nickel waste and purified, has realistic significance of recycling materials and protecting the environment, and is particularly suitable for environment-friendly enterprises in which the nickel-containing waste is subjected to various links of impurity removal to obtain nickel-containing solution.

Description

technical field [0001] The invention discloses a production method of nickel powder, in particular to a method for directly producing nickel powder by electrowinning pure nickel sulfate solution. Background technique [0002] Nickel powder is an important raw material, mainly used in atomic energy industry, alkaline batteries, electrical alloys, high-temperature high-strength alloys, catalysts and powder metallurgy additives, etc. , aerospace and other important raw materials. [0003] The production methods of nickel powder mainly include electrolytic method, atomization method and chemical method. The atomization method is to melt nickel or nickel alloy and then blow it into nickel powder. The appearance of nickel powder produced by this method is irregular spherical. It is easy to oxidize during the injection process, and the powder particles are relatively coarse. The advantage is that it can produce nickel alloy powder. [0004] Nickel powder produced by chemical met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C5/02
Inventor 何家成
Owner CENT SOUTH UNIV
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