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Method for preparing spherical nickel hydroxide by using used nickel-metal hydride batteries

A spherical nickel hydroxide and nickel metal hydride battery technology, applied in battery recycling, recycling technology, process efficiency improvement and other directions, can solve the problems of low efficiency, high cost, complicated operation, etc., achieve high efficiency, reduce recycling cost, The effect of simple process operation

Active Publication Date: 2014-10-01
先进储能材料国家工程研究中心有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the disadvantages of complex operation, low efficiency and high cost due to the large difference in the removal methods of different metal impurities with different concentrations.
At the same time, the recovered products are mainly industrial-grade nickel salts, cobalt salts, etc., most of which have only been recycled and reused, but have not been returned to battery manufacturing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for preparing spherical nickel hydroxide using used nickel-hydrogen batteries, proceed as follows:

[0019] (1) The battery cell obtained by breaking the shell of the used Ni-MH battery is broken into powder;

[0020] (2) Take 1kg of electric core powder and add it to 30L of mixed solution composed of sulfuric acid and oxidant hydrogen peroxide (the sulfuric acid concentration is 0.5mol / L and the hydrogen peroxide concentration is 0.8ml / g), and heat to 60~65℃ , Continue to stir for 4h to obtain the extract. The concentration of the leaching solution is: Ni12-17g / L, Co0.5-1.5g / L, Re3-6g / L, Fe0.05-0.3g / L, Zn0.1-0.5g / L, Mn0.1-0.5g / L. The PH value is about 0.8-1.0.

[0021] (3) Adjust the pH value to 1.5 with 4mol / L NaOH, maintain a constant temperature of 60°C, add excess anhydrous sodium sulfate while stirring, and the rare earth elements can be precipitated in the form of rare earth sulfates. Let it stand for solid-liquid separation to obtain a rare earth-removed ...

Embodiment 2

[0027] A method for preparing spherical nickel hydroxide using used nickel-hydrogen batteries. The operation steps are similar to those in the embodiment, except that:

[0028] 1. In step (4), according to the volume ratio of the organic phase to the aqueous phase solution of 5:1, the organic solution of the extractant with a PH value of 2.8 is added to it, wherein the extractant is a mole of naphthalenesulfonic acid and pyridine carboxylic acid ester. For a compound with a ratio of 1:5, the organic solvent used in the organic solvent of the extractant is 260 mineral spirits;

[0029] 2. In step (5), the volume ratio of the organic phase to the water phase is 3:1.

Embodiment 3

[0031] A method for preparing spherical nickel hydroxide using used nickel-hydrogen batteries, proceed as follows:

[0032] (1) The battery cell obtained by breaking the shell of the used Ni-MH battery is broken into powder;

[0033] (2) Take 1kg of electric core powder and add it to 30L of mixed solution composed of sulfuric acid and oxidant hydrogen peroxide (the sulfuric acid concentration is 0.5mol / L and the hydrogen peroxide concentration is 0.8ml / g), and heat to 60~65℃ , Continue to stir for 4h to obtain the extract. The concentration of the leaching solution is: Ni12-17g / L, Co0.5-1.5g / L, Re3-6g / L, Fe0.05-0.3g / L, Zn0.1-0.5g / L, Mn0.1-0.5g / L. The PH value is about 0.8-1.0.

[0034] (3) Adjust the PH value to 1.5 with 4mol / L NaOH, maintain a constant temperature of 50°C, add excess anhydrous sodium sulfate while stirring, and the rare earth elements can be precipitated in the form of rare earth sulfates. Let it stand for solid-liquid separation to obtain a rare earth-removed ...

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Abstract

The invention provides a method for preparing spherical nickel hydroxide by using used nickel-metal hydride batteries. The method comprises the following steps of: disassembling the used nickel-metal hydride batteries, crushing cells, dissolving the cells and precipitating with rare earth to obtain aqueous solution with rare earth removed, and then using an extractant organic solution to carry out counter-current extraction on the solution to extract out nickel, cobalt and zinc; carrying out back extraction by using an inorganic strong acid to obtain a strong acid inorganic salt solution containing nickel, cobalt and zinc ions; supplementing corresponding metal salts in the solution according to the difference between the amount of each metal element needed by preparation of spherical nickel hydroxide and the amount of corresponding metal in the obtained strong acid inorganic salt solution containing nickel, cobalt and zinc ions, so as to obtain the raw material solution used for preparing spherical nickel hydroxide, then proportionally adding the raw material solution with other raw materials in a reaction container, and synthesising spherical nickel hydroxide. The method is simple in process, the strong acid inorganic salt solution containing nickel, cobalt and zinc ions, which is obtained by back extraction, is directly used for preparing spherical nickel hydroxide, and the step of separation refining crystallization is omitted, thus the efficiency is high and the cost can be reduced.

Description

Technical field [0001] The invention relates to a method for preparing spherical nickel hydroxide, in particular to a method for preparing spherical nickel hydroxide by using a used nickel-hydrogen battery. Background technique [0002] Ni-MH batteries are currently one of the most mature new energy batteries commercialized on the market, and are widely used in people's daily lives. With the gradual depletion of mineral resources such as nickel sulfide, as well as the increase in environmental protection requirements and the need for resource recycling, the recycling of waste batteries has emerged as a major issue. However, domestic recycling of used batteries has not been greatly developed due to complex processes, low efficiency, and high cost. [0003] The traditional battery recycling method is to disassemble and crush the battery, leaching with sulfuric acid, and remove the low-priced metals in the leaching solution as impurities by precipitation or extraction methods, leavin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B19/30H01M10/54
CPCY02P10/20Y02W30/84
Inventor 王一乔蒋庆来杨先锋齐士博葛良知石建珍张洪涛欧腾蛟肖连生
Owner 先进储能材料国家工程研究中心有限责任公司
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