Method for recycling rare earth from asymmetric capacitive type nickel-metal hydride battery

An asymmetric capacitor, nickel-metal hydride battery technology, applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve the problems of incomplete separation and long process flow, and achieve good leaching effect, good economy and cost. low effect

Active Publication Date: 2017-10-20
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patented process is long, and the extraction and stripping process will produce a large amount of industrial wastewater
And rare earth metals are not directly separated from m

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Take 10 g of anode materials for asymmetric capacitive nickel-hydrogen batteries, including nickel 52.3wt.%, cobalt 4wt.%, rare earth metals 12wt.%, and the rest are non-metals and impurities. The negative electrode material is crushed, and the particle size after crushing and sieving is 75 μm, and then the negative electrode material is dissolved in 10ml of a hypochlorous acid solution with a concentration of 5wt.%; stand at 25°C for 40 minutes, add 190g / L sulfuric acid solution, sulfuric acid solution and negative electrode material The mass ratio is 10:1; leaching at normal temperature and pressure for 20 minutes, and filtering to obtain leachate and filter cake. After testing, the leaching solution does not contain nickel and cobalt.

[0049] The composition content of the rare earth metals is lanthanum 61wt.%, cerium 32wt.%, praseodymium 1.2wt.%, scandium 0.8wt.%, and the rest are other rare earth metals.

[0050] (2) Gradually add solid sodium hydroxide to th...

Embodiment 2

[0053] (1) Take 10 g of anode materials for asymmetric capacitive nickel-hydrogen batteries, including nickel 52.3wt.%, cobalt 4wt.%, rare earth metals 12wt.%, and the rest are non-metals and impurities. The negative electrode material is crushed, and the particle size after crushing and sieving is 75 μm, and then the negative electrode material is dissolved in 8ml of a hypochlorous acid solution with a concentration of 10wt.%; stand at 30°C for 20 minutes, add 190g / L sulfuric acid solution, sulfuric acid solution and negative electrode material The mass ratio is 9:1; under normal pressure, leaching at 20°C for 20 minutes, and filtering to obtain leachate and filter cake. After testing, the leaching solution does not contain nickel and cobalt.

[0054] The composition content of the rare earth metals is lanthanum 61wt.%, cerium 32wt.%, praseodymium 1.2wt.%, scandium 0.8wt.%, and the rest are other rare earth metals.

[0055] (2) Gradually add solid sodium hydroxide to the lea...

Embodiment 3

[0058] (1) Take 10 g of anode materials for asymmetric capacitive nickel-hydrogen batteries, including nickel 52.3wt.%, cobalt 4wt.%, rare earth metals 12wt.%, and the rest are non-metals and impurities. The negative electrode material is crushed, the particle size is 75 μm after crushing and sieving, and then the negative electrode material is dissolved in 10ml of hypochlorous acid solution with a concentration of 7wt.%; stand at 25°C for 20 minutes, add 160g / L sulfuric acid solution, sulfuric acid solution and negative electrode material The mass ratio is 10:1; under normal pressure, leaching at 20°C for 20 minutes, and filtering to obtain leachate and filter cake. After testing, the leaching solution does not contain nickel and cobalt.

[0059] The composition content of the rare earth metals is lanthanum 61wt.%, cerium 32wt.%, praseodymium 1.2wt.%, scandium 0.8wt.%, and the rest are other rare earth metals.

[0060] (2) Gradually add solid sodium hydroxide to the leaching...

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Abstract

The invention belongs to the technical field of rare earth recycling, and particularly relates to a method for recycling rare earth from an asymmetric capacitive type nickel-metal hydride battery. The method comprises the steps that the asymmetric capacitive type nickel-metal hydride battery is disassembled to obtain a negative electrode material, the negative electrode material is dissolved into a hypochlorous acid solution after being crushed, standing is carried out, a sulfuric acid solution is added, leaching and filtering are carried out, and lixivium and a filter cake are obtained; and solid sodium hydroxide is added into the lixivium, the pH value is controlled, precipitation is generated, rare earth sulfuric acid double salt precipitation and filter liquor are obtained through filtering, and after the concentration of sulfuric acid in the filter liquor is adjusted, the filter liquor is returned to the leaching procedure to be cyclically utilized. According to the method, the separation effect of the rare earth and other metal is good, the rare earth recycling rate is high, the process is simple, cost is low, operation is convenient, and energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of rare earth recovery, and in particular relates to a method for recovering rare earth from an asymmetrical capacitive nickel-hydrogen battery. Background technique [0002] At present, the recovery and treatment methods of valuable metals in traditional nickel-metal hydride batteries mainly include fire treatment and wet treatment. Among them, pyrolysis is pyrolysis under high temperature conditions, and the products are mainly metals such as nickel and cobalt, which are then separated and purified. Due to the inability to recover the rare earth elements in the ash and the huge pollution, it has been banned. Wet treatment is mainly carried out by leaching and organic solvent extraction, that is, the metal elements are dissolved first, transferred to the solution, and then nickel and cobalt are separated by organic solvent extraction, and then the corresponding metal phase is recovered by stripping. The t...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B7/00C22B23/00H01M10/54
CPCC22B7/007C22B23/0423C22B23/043C22B23/0461C22B59/00H01M10/54Y02P10/20Y02W30/84
Inventor 张亚莉楚玮蒋志军李德刚
Owner SHANDONG UNIV OF TECH
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