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Method for recycling rare earth by means of asymmetrical capacitance type nickel metal hydride battery

A technology for asymmetric capacitors and nickel-metal hydride batteries, which is applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve problems such as incomplete separation and long process flow, and achieve good leaching effect, good economy, and process flow simple effect

Active Publication Date: 2017-11-03
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 metals such as nickel and cobalt, and it is easy to coat metals such as nickel and cobalt when generating rare earth sulfuric acid compound salt, resulting in incomplete separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (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.%; it is left to stand at 25°C for 40 minutes, and 170g / L hydrochloric acid solution is added, and the hydrochloric acid solution and the negative electrode material The mass ratio is 10:1; leaching at normal temperature and pressure for 25 minutes, and filtering to obtain leachate and filter cake. After testing, the leaching solution does not contain nickel and cobalt.

[0050] 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.

[0051] (2)...

Embodiment 2

[0054] (1) Take 10g of anode material for asymmetric capacitive nickel-hydrogen battery, including nickel 56wt.%, cobalt 5wt.%, rare earth metal 11.5wt.%, and the rest are non-metals and impurities. Crush the negative electrode material, the particle size is 50 μm after crushing and sieving, then dissolve the negative electrode material in 8ml of 10wt.% hypochlorous acid solution; let stand at 30°C for 20 minutes, add 190g / L hydrochloric acid solution, hydrochloric 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.

[0055] The composition content of the rare earth metals is lanthanum 61.5wt.%, cerium 33wt.%, praseodymium 1.1wt.%, scandium 0.6wt.%, and the rest are other rare earth metals.

[0056] (2) Gradually add solid sodium carbonate to the leaching solution at 20°C, stir, and ...

Embodiment 3

[0059] (1) Take 10g of asymmetric capacitive nickel-hydrogen battery negative electrode material, including nickel 62.1wt.%, cobalt 3.8wt.%, rare earth metal 11wt.%, and the rest are non-metals and impurities. The negative electrode material is crushed, the particle size is 70 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 30 minutes, add 160g / L hydrochloric acid solution, hydrochloric acid solution and negative electrode material The mass ratio is 10:1; under normal pressure, leaching at 20°C for 15 minutes, and filtering to obtain leachate and filter cake. After testing, the leaching solution does not contain nickel and cobalt.

[0060] The composition content of the rare earth metals is lanthanum 62wt.%, cerium 32wt.%, praseodymium 1.3wt.%, scandium 0.8wt.%, and the rest are other rare earth metals.

[0061] (2) Gradually add solid sodium carbonate t...

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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 by means of an asymmetrical capacitance type nickel metal hydride battery. According to the method, the asymmetrical capacitance type nickel metal hydride battery is disassembled to obtain a negative electrode material, after being crushed, the negative electrode material is dissolved into a hypochloric acid solution and subjected to standing, a hydrochloric acid solution is added, leaching and filtering are performed, and leachate and a filter cake are obtained; solid sodium carbonate is added into the leachate, a pH value is controlled, precipitate is generated, filtering is performed so that rare earth carbonate complex salt precipitate and filtrate can be obtained, and after the concentration of hydrochloric acid in the filtrate is adjusted, the filtrate returns to the leaching procedure to be cyclically utilized. In the method, the rare earth is directly separated from other metal, the rare earth recycling rate is high, the procedure is simple, cost is low, operation is convenient, and energy consumption is small.

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 earths by utilizing 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 strippin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B7/00C22B23/00H01M10/54
CPCC22B7/007C22B23/043C22B23/0453C22B59/00H01M10/54Y02P10/20Y02W30/84
Inventor 张亚莉蒋志军楚玮李德刚
Owner SHANDONG UNIV OF TECH
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