Method for removing iron in waste nickel-metal hydride battery

A nickel-metal hydride battery, waste technology, applied in battery recycling, chemical instruments and methods, nickel compounds, etc., can solve problems such as no new treatment plan reports

Active Publication Date: 2020-10-30
包头昊明稀土新电源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The current registrations are limited to the above-mentioned three solutions...

Method used

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  • Method for removing iron in waste nickel-metal hydride battery
  • Method for removing iron in waste nickel-metal hydride battery

Examples

Experimental program
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Effect test

Embodiment 1

[0059] A method for removing iron in waste nickel-metal hydride batteries, comprising the steps of:

[0060] (1) Using a mechanical cyclone to separate waste nickel-metal hydride batteries into sulfonated diaphragm and non-sulfonated diaphragm materials with a sulfur mass fraction of 0.5%;

[0061] (2) Dissolve the non-sulfonated diaphragm material in a mixed solution of sulfuric acid and hydrogen peroxide, wherein the molar ratio of sulfuric acid and hydrogen peroxide is 10:0.5, then use sodium hydroxide to precipitate rare earth, and separate the rare earth compound by filtration to obtain a nickel-cobalt solution , the pH value is 5.0;

[0062] (3) Finely crush the sulfonated diaphragm to a particle size of 5mm, spray it into the combustion furnace through a spray device, and carry out combustion under an oxygen-enriched air atmosphere; the mixed gas generated by combustion is pressurized by a compressor, and the pressurized pressure is 0.15MPa; The pressurized mixed gas i...

Embodiment 2

[0088] A method for removing iron in waste nickel-metal hydride batteries, comprising the steps of:

[0089] (1) Using a mechanical cyclone to separate waste nickel-metal hydride batteries into sulfonated diaphragm and non-sulfonated diaphragm materials with a sulfur mass fraction of 0.2%;

[0090] (2) Dissolve the non-sulfonated diaphragm material in a mixed solution of sulfuric acid and hydrogen peroxide, wherein the molar ratio of sulfuric acid and hydrogen peroxide is 10:0.3, then use sodium hydroxide to precipitate rare earth, and separate the rare earth compound by filtration to obtain a nickel-cobalt solution , the pH value is 4.5;

[0091] (3) Finely crush the sulfonated diaphragm to a particle size of 1mm, spray it into the combustion furnace through a spray device, and carry out combustion under an oxygen-enriched air atmosphere; the mixed gas generated by the combustion is pressurized by a compressor, and the pressurized pressure is 0.1MPa; The pressurized mixed ga...

Embodiment 3

[0096] A method for removing iron in waste nickel-metal hydride batteries, comprising the steps of:

[0097] (1) Using a mechanical cyclone to separate waste nickel-metal hydride batteries into sulfonated diaphragm and non-sulfonated diaphragm materials with a sulfur mass fraction of 0.3%;

[0098] (2) Dissolve the non-sulfonated diaphragm material in a mixed solution of sulfuric acid and hydrogen peroxide, wherein the molar ratio of sulfuric acid and hydrogen peroxide is 10:0.8, then use sodium hydroxide to precipitate rare earth, and obtain a nickel-cobalt solution after filtration, with a pH value of 4.8 ;

[0099] (3) Finely crush the sulfonated diaphragm to a particle size of 8mm, spray it into the combustion furnace through a spray device, and carry out combustion under an oxygen-enriched air atmosphere; the mixed gas generated by combustion is pressurized by a compressor, and the pressurized pressure is 0.12MPa; The pressurized mixed gas is passed into the autoclave to...

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Abstract

The invention belongs to the technical field of waste material retreatment, and particularly relates to a method for removing iron in a waste nickel-metal hydride battery. The method comprises the steps of: separating a sulfonated diaphragm material and a non-sulfonated diaphragm material from a waste nickel-metal hydride battery; dissolving the non-sulfonated diaphragm material, and separating out rare earth compound precipitates to obtain a nickel-cobalt solution; finely crushing the sulfonated diaphragm, spraying the crushed sulfonated diaphragm into a combustion furnace through a sprayingdevice, and carrying out combustion in an oxygen-enriched air atmosphere; pressurizing mixed gas generated by combustion, and mixing and reacting the pressurized mixed gas with the nickel-cobalt solution in a high-pressure kettle; and after the reaction is finished, transferring middle-upper-layer clear liquid to obtain a deeply purified nickel-cobalt solution, and directly entering a subsequent ternary precursor synthesis process. The method is simple in process, sulfur in the sulfonated diaphragm can enter a nickel-cobalt solution pool in the form of a mixture of sulfur dioxide and air for iron removal, the removal rate is larger than 99.5%, and sulfur reutilization is achieved; and the product obtained after SO2 oxidation is SO4<2->, other impurity ions are not introduced, the iron removal cost is low, and the method has great industrial value.

Description

technical field [0001] The invention belongs to the technical field of reprocessing waste materials, and in particular relates to a method for removing iron in waste nickel-hydrogen batteries. Background technique [0002] Waste nickel-metal hydride batteries are composed of metal materials and non-metal materials. The non-metal materials are mainly sulfonated diaphragms, which contain a certain amount of S. Improper treatment will cause sulfide pollution; metal materials are mainly rare earth, nickel and cobalt materials, and For iron impurities with a very low ratio, after the metal material is dissolved, Fe enters the nickel-cobalt solution together with the valuable metals. When these valuable metal products are recovered from the leaching solution by electrowinning or precipitation processes, corresponding purification must be carried out deal with. [0003] Valuable metals Ni, Co and impurity element Fe in the solution are variable-valence metal ions, which can be pre...

Claims

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Application Information

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IPC IPC(8): C01G53/00C22B7/00C22B59/00C22B23/00C22B1/00H01M10/54
CPCC01G53/40C22B7/007C22B59/00C22B23/043C22B1/005H01M10/54Y02W30/84Y02P10/20
Inventor 蒋志军张亚莉朱晓梅蒋昊臻乔敏刚刘金荣杜立军李林
Owner 包头昊明稀土新电源科技有限公司
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