Method for Recovering Rare Earth from Asymmetric Capacitive Ni-MH Batteries

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

Active Publication Date: 2019-06-18
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

[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 recovery, and in particular relates to a method for recovering rare earth from an asymmetrical capacitive nickel-hydrogen battery. The method is to disassemble the asymmetric capacitive nickel-metal hydride battery to obtain the negative electrode material, dissolve it in the hypochlorous acid solution after being broken, let it stand, add sulfuric acid solution, leaching, and filtering to obtain the leaching solution and filter cake; adding solid hydroxide to the leaching solution Sodium, control the pH value, produce precipitation, filter to obtain the rare earth sulfate double salt precipitation and filtrate, adjust the concentration of sulfuric acid in the filtrate, and then return the filtrate to the leaching process for recycling. The invention has good separation effect of rare earth and other metals, high recovery rate of rare earth, simple process, low cost, convenient operation and low energy consumption.

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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Patent Type & Authority Patents(China)
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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