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Diaphragm pyrolysis assisted recovery method for valuable metals in waste lithium battery material

A waste lithium battery, valuable metal technology, applied in the direction of waste collector recycling, lithium carbonate;/acid carbonate, etc., can solve problems such as increasing cost and increasing carbon resource consumption, and achieves easy operation and avoidance. Adding and improving the effect of acid leaching efficiency

Active Publication Date: 2022-07-15
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When recycling lithium-ion batteries in the combined fire-wet process, graphite, lignite and other external carbon sources are usually used as reducing agents to reduce high-valence metals, which has achieved good recovery results, but will increase the consumption of carbon resources.
In addition, the recycling of waste separators in lithium-ion batteries is generally separated as waste plastics, which increases the cost of storage, transportation and management.

Method used

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  • Diaphragm pyrolysis assisted recovery method for valuable metals in waste lithium battery material
  • Diaphragm pyrolysis assisted recovery method for valuable metals in waste lithium battery material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] a. Soak the waste lithium-ion battery in a 5% sodium chloride solution for 24 hours to discharge, and then manually disassemble the positive electrode and the diaphragm;

[0036] b. Put the disassembled positive electrode sheet into the universal crusher for crushing, the obtained crushed product is sieved through a 200-mesh sieve, the aluminum sheet is enriched on the sieve, and the positive electrode material under the sieve is placed in a muffle with a temperature of 500 ° C. Oxygen calcination is carried out in the furnace for 2 hours to remove the binder to obtain waste ternary positive electrode powder for reduction roasting; the time for crushing in the universal crusher is 15s.

[0037] c. Cut the obtained diaphragm to 2mm so that it can be mixed evenly with the waste ternary positive electrode powder, and mix the shredded diaphragm with the waste ternary positive electrode powder and put it into the tube furnace; The mass ratio of the positive electrode powder ...

Embodiment 2

[0043] a. Soak the waste lithium-ion battery in a sodium chloride solution with a mass fraction of 5% for 24 hours to discharge, and then manually disassemble the positive electrode and the diaphragm;

[0044] b. Put the disassembled positive electrode sheet into the universal crusher for crushing. The obtained crushed product is sieved through a 200-mesh sieve, and the aluminum sheet is enriched on the sieve. Oxygen calcination is carried out in the furnace for 2 hours to remove the binder to obtain waste ternary positive electrode powder for reduction roasting; the time for crushing in the universal crusher is 18s.

[0045] c. Cut the obtained diaphragm to 2.5mm so that it can be evenly mixed with the waste ternary positive electrode powder, and mix the shredded diaphragm and the waste ternary positive electrode powder evenly into the tube furnace; The mass ratio of the ternary cathode powder is 10%.

[0046] d. The air in the tube furnace is pumped out by a vacuum pump to ...

Embodiment 3

[0051] a. Soak the waste lithium-ion battery in a sodium chloride solution with a mass fraction of 5% for 24 hours to discharge, and then manually disassemble the positive electrode and the diaphragm;

[0052] b. Put the disassembled positive electrode sheet into the universal crusher for crushing. The obtained crushed product is sieved through a 200-mesh sieve, and the aluminum sheet is enriched on the sieve. Oxygen calcination is carried out in the furnace for 2 hours to remove the binder to obtain waste ternary positive electrode powder for reduction roasting; the time for crushing in the universal crusher is 20s.

[0053] c. Cut the obtained diaphragm to 3mm so that it can be mixed evenly with the waste ternary positive electrode powder, and mix the shredded diaphragm and the waste ternary positive electrode powder evenly into the tube furnace; The mass ratio of the positive electrode powder is 12%.

[0054] d. The air in the tube furnace is pumped out by a vacuum pump to...

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Abstract

The invention discloses a method for recycling valuable metals in a waste lithium battery material assisted by diaphragm pyrolysis, which comprises the following steps of: performing thermal reduction on high-valence transition metals in a waste ternary positive electrode material by using a diaphragm in a waste lithium battery, reducing nickel and cobalt into simple substances or divalent oxides, reducing manganese into low-valence divalent manganese, and forming lithium carbonate by a lithium element. And the reduced waste ternary positive electrode powder is leached in a hot sulfuric acid solution, and finally the leaching efficiency of lithium, nickel, cobalt and manganese is larger than 99%. Meanwhile, pyrolysis oil and pyrolysis gas generated by diaphragm pyrolysis in the thermal reduction process can be recycled as fuel. According to the technical scheme, the purposes of efficient recycling of valuable metal and efficient utilization and resource recycling of the waste diaphragm are synchronously achieved, the technological process is simple, the efficiency is high, and the transportation, storage and management cost is effectively reduced.

Description

technical field [0001] The invention relates to a method for recovering waste and used lithium ion batteries, in particular to a method for recovering valuable metals of waste lithium battery materials assisted by diaphragm pyrolysis, which is suitable for new energy vehicles and energy storage equipment in the energy field. [0002] technical background [0003] Lithium-ion batteries have been widely used in new energy vehicles and energy storage devices in the energy field. However, a large number of waste lithium-ion batteries will be generated with performance degradation. According to reports, by 2030, the global waste lithium-ion battery will exceed 11 million tons. On the one hand, waste lithium-ion batteries contain a large amount of valuable metals, and recycling them will help promote my country's economic cycle; on the other hand, these valuable metals are mostly heavy metals, and lithium batteries also contain a large amount of plastics. , will cause serious envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12C22B23/00C22B47/00C22B1/02C01D15/08H01M10/54
CPCC22B7/007C22B26/12C22B23/043C22B47/00C22B1/02C01D15/08H01M10/54
Inventor 何亚群韦能李文秀张光文张峰彬李金龙冯驿
Owner CHINA UNIV OF MINING & TECH
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