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Method for safely leaching waste batteries and application

A waste battery and leaching technology, which is applied in battery recycling, recycling technology, waste collector recycling, etc., can solve the problems of excessive aluminum content, unsafe hydrogen gas, and inability to remove aluminum, so as to reduce the adhesion performance and improve safety , the effect of reducing the dosage

Inactive Publication Date: 2021-10-15
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current recycling of waste lithium-ion batteries mainly includes a series of operations such as coarse crushing, physical screening, and fine crushing of waste lithium-ion batteries to obtain the particulate matter of waste lithium battery powder, but the recycled waste lithium battery powder contains a low amount of aluminum. Slag particle impurities, whose particle size is similar to that of waste lithium-ion battery powder, are mixed with active material powder, binder and other particles, and can react with acid and alkali, so the treatment of aluminum slag impurity particles is difficult
Due to the generation of flammable and explosive hydrogen gas during the recovery process of aluminum and subsequent valuable metals, it is dangerous
[0004] Moreover, the current use of hydrometallurgical recycling to prepare positive electrode materials mostly faces the problem of excessive aluminum content. The treatment methods mainly focus on the front-end treatment of the battery, using acid leaching, high-temperature heat treatment or alkali leaching, but these three methods have their own advantages. Each has its own disadvantages. The cost of acid leaching is high and hydrogen will be generated, causing unsafe problems. High-temperature treatment consumes a lot of energy and cannot remove aluminum. The aluminum content in the positive electrode material prepared after alkaline leaching is still higher than the battery-grade standard.

Method used

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  • Method for safely leaching waste batteries and application
  • Method for safely leaching waste batteries and application
  • Method for safely leaching waste batteries and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The method for the safe leaching of waste batteries of the present embodiment comprises the following specific steps:

[0045] (1) The recovered lithium iron phosphate battery is disassembled and discharged, and after being roughly crushed mechanically, the broken waste lithium battery is placed in a sintering kiln for roasting, the roasting temperature is controlled at 350°C, and the roasting is stable for 4.8 hours, and the heating rate during the period is controlled At about 15°C / min, the gas generated by roasting is collected with 0.01mol / L sodium hydroxide lye, and the waste lithium batteries after roasting are vibrated and screened, and the color sorter sorts aluminum foil and copper foil, and then the sorting The finished waste lithium battery powder is ground by a ball mill;

[0046] (2) Add waste lithium battery powder after ball milling into pure water, the solid-to-liquid ratio of waste lithium battery powder:water is 1:1.5g / ml, stir and remove floating impu...

Embodiment 2

[0051] The method for the safe leaching of waste batteries of the present embodiment comprises the following specific steps:

[0052] (1) The recovered lithium iron phosphate battery is disassembled and discharged, and after being roughly crushed mechanically, the broken waste lithium battery is placed in a sintering kiln for roasting. The roasting temperature is controlled at 580°C, and the roasting is stable for 2.4 hours. During the period, the heating rate is controlled. At 23°C / min, the gas generated by roasting is collected with 0.04mol / L sodium hydroxide lye, and the waste lithium batteries after roasting are vibrated and screened. The color sorter sorts aluminum foil and copper foil, and then the sorting is completed. The waste lithium battery powder is ground by a ball mill;

[0053] (2) Add waste lithium battery powder after ball milling into pure water, the solid-to-liquid ratio of waste lithium battery powder:water is 1:2.5g / ml, stir and remove floating impurities,...

Embodiment 3

[0057] The method for the safe leaching of waste batteries of the present embodiment comprises the following specific steps:

[0058] (1) The recovered lithium iron phosphate battery is disassembled and discharged, and after being coarsely crushed by machinery, the broken waste lithium battery is placed in a sintering kiln for roasting. The roasting temperature is controlled at 420°C, and the roasting is stable for 3.5 hours. During the period, the heating rate is controlled. At 18°C / min, the gas generated by roasting is collected with 0.09mol / L sodium hydroxide lye, and the waste lithium batteries after roasting are vibrated and screened. The color sorter sorts aluminum foil and copper foil, and then the sorting is completed The waste lithium battery powder is ground by a ball mill;

[0059] (2) Add waste lithium battery powder after ball milling into pure water, the solid-to-liquid ratio of waste lithium battery powder:water is 1:2.5g / ml, stir and remove floating impurities,...

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Abstract

The invention belongs to the technical field of waste battery recovery, and discloses a method for safely leaching waste batteries and application. The method comprises the following steps that discharging, roasting and screening are carried out on a waste lithium battery to obtain copper aluminum foil and battery powder; the battery powder is added into water, then a flotation agent is added for flotation, and a floating material and a sediment substance are obtained; leaching is carried out on the floating material by using alkali liquor filtering is carried out, and filtrate b and filter residues a are obtained; washing and filtering are carried out on the filter residues a, filter residues c are taken, a leaching agent and a reducing agent are added for leaching, and leaching liquid is obtained. According to the method, safe, efficient and low-energy-consumption physical methods such as roasting, screening and flotation are combined with chemical methods such as dilute alkali dissolution, and aluminum in the waste lithium batteries can be removed from the source.

Description

technical field [0001] The invention belongs to the technical field of recycling waste batteries, and in particular relates to a method and application for safe leaching of waste batteries. Background technique [0002] Waste lithium-ion batteries are composed of positive electrodes, negative electrodes, electrolytes, and separators. Among them, the negative electrode is composed of graphite, binder, conductive agent and current collector, and the positive electrode is made of active material powder, binder and conductive agent coated on the current collector. Metals with potential recycling value include Ni, Mn, Co, Li, Al, etc. [0003] The current recycling of waste lithium-ion batteries mainly includes a series of operations such as coarse crushing, physical screening, and fine crushing of waste lithium-ion batteries to obtain the particulate matter of waste lithium battery powder, but the recycled waste lithium battery powder contains a low amount of aluminum. Slag pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B26/12C22B47/00C22B23/00B03D1/00H01M10/54
CPCC22B7/008C22B1/02C22B7/007C22B26/12C22B47/00C22B23/0415B03D1/00H01M10/54Y02W30/84Y02P10/20
Inventor 余海军钟应声谢英豪李长东张学梅
Owner GUANGDONG BRUNP RECYCLING TECH
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