Once process for extracting and separating Ni, Mg and Co from nickel sulfate solution recovered from waste nickel-hydrogen and nickel-cadmium cells

A nickel-cadmium battery and nickel sulfate technology, applied in the field of cobalt, separation of nickel and magnesium, can solve the problems of affecting equipment life, large reaction energy consumption, corrosion, etc., and achieve the effects of small equipment investment, strong operability and simple process

Active Publication Date: 2006-03-29
广东芳源新材料集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) the solubility of sodium fluoride is small, the reaction time is long, heating is required, the reaction energy consumption is large, and the precipitation and filtration performance of the generated magnesium fluoride is poor; (2) sodium ions are introduced into nickel sulfate during the magnesium removal process solution, affecting the quality of nickel sulfate crystallization; (3) residual fluorine in the nickel sulfate solution has a corrosive effect on the enamel concentration kettle in the subsequent concentration process, affecting the life of the equipment; (4) fluorine in the wastewater causes wastewater treatment difficulties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The sulfuric acid leaching solution of the nickel-hydrogen and / or nickel-cadmium battery positive electrode waste after the impurity removal is adjusted to a pH value of 5.0, and the organic phase is composed of di-(2-ethylhexyl)phosphonic acid mono(2-ethylhexyl) as an extractant Esters and kerosene as a diluent, the concentration of bis-(2-ethylhexyl)phosphonic acid mono(2-ethylhexyl)ester is 0.6mol / L, O / A=1 / 1, 12 stages of contact extraction , so that the magnesium is transferred into the organic phase and the nickel is retained in the water phase, and then the loaded organic phase is washed with dilute sulfuric acid in six stages. Sulfuric acid is used to carry out six-stage washing of the loaded organic phase, and the pH value of the washing end point is controlled at 4.4, so that magnesium is transferred to the washing outlet liquid, and then 1N sodium hydroxide is used to recover the nickel precipitation in the washing outlet liquid, and the pH value of the precipi...

Embodiment 2

[0021] The sulfuric acid leaching solution of the nickel-hydrogen and / or nickel-cadmium battery positive electrode waste after the impurity removal is adjusted to a pH value of 4.8, and the organic phase is composed of di-(2-ethylhexyl)phosphonic acid mono(2-ethylhexyl) as an extractant Esters and kerosene as a diluent, the concentration of bis-(2-ethylhexyl)phosphonic acid mono(2-ethylhexyl)ester is 1.2mol / L, O / A=1 / 1, 12 stages of contact extraction , so that the magnesium is transferred into the organic phase and the nickel is retained in the water phase, and then the loaded organic phase is washed with dilute sulfuric acid in six stages. Sulfuric acid washes the loaded organic phase in six stages, and the pH value of the washing end is controlled at 4.5, so that magnesium is transferred to the washing outlet liquid, and then 1N sodium hydroxide is used to recover the nickel precipitate in the washing outlet liquid, and the process of comprehensive extraction, washing and pre...

Embodiment 3

[0023] The sulfuric acid leaching solution of the nickel-hydrogen and / or nickel-cadmium battery positive electrode waste after the impurity removal is adjusted to a pH value of 4.9, and the organic phase is composed of di-(2-ethylhexyl) phosphonic acid mono(2-ethylhexyl) as an extractant Esters and kerosene as a diluent, the concentration of di-(2-ethylhexyl) phosphonic acid mono(2-ethylhexyl) ester is 1.5mol / L, using 12-stage extraction and 6-stage nickel washing, 6-stage Fractional extraction of washed magnesium, the extraction is carried out in a mixing and settling tank. The effective volume of the mixing chamber of the mixing and clarifying tank for extraction is 200L, the mixing speed is 80rpm, and the effective volume of the clarifying chamber is 600L.

[0024] Since it takes about 5 minutes for the magnesium extraction to reach equilibrium, the sum of the feed liquid flow rate and the organic phase flow rate is 40L / min, the feed liquid flow rate is 10L / min, the organic...

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PUM

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Abstract

A process for extracting Ni, Mg and Co from the used NiH or NiCd battery includes such steps as immersing the positive electrodes of used NiH or NiCd batteries in sulfuric acid to obtain liquid extract, regulating pH=4.5-5.0, fractionating to transfer Mg and Co in the organic phase prepared from bis-(2-ethylhexyl) phosphonate mono-(2-ethylhexyl) ester and kerosene and to retain Ni in water phase, respectively washing Ni and Mg, and draining the Mg washing liquid from another outlet.

Description

technical field [0001] The invention relates to a method for separating nickel, cobalt, and magnesium in a soluble nickel sulfate, magnesium, and cobalt mixture solution, in particular to a method for separating nickel, cobalt, and Magnesium way. Background technique [0002] Nickel sulfate, xNiSO4·6H 2 O·yNiSO 4 ·7H 2 O is often used as an important raw material in the electroplating industry for pre-nickel plating, nickel plating, nickel-iron alloy plating, nickel-cobalt alloy plating, nickel-zinc alloy plating, and in chemical nickel plating solutions; Manufacture of nickel-cadmium batteries, nickel-metal hydride batteries, catalysts for hardening oil or paint, mordants for vat dyes, metal colorants, etc., and are also used to prepare nickel catalysts and other nickel salts. Nickel sulfate quality requirements (industrial nickel sulfate People's Republic of China chemical industry standard HG / T2824-1997) impurity Mg content ≤ 0.015%, so need to remove magnesium to nic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/26C22B23/00C22B26/22
CPCY02P10/20
Inventor 罗爱平吴芳
Owner 广东芳源新材料集团股份有限公司
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