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Method for recovering lithium from waste lithium ion battery and waste pole piece

A lithium-ion battery and lithium recovery technology, applied in the field of lithium recovery, can solve the problems of low industrialization value, insignificant economic benefits, and large site demand, achieving considerable economic value, low cost, and pollution-free effects

Active Publication Date: 2011-01-12
HUNAN BRUNP RECYCLING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the product positioned in the reported process of recovering lithium from lithium-ion batteries is generally lithium carbonate. The process of recovering lithium to prepare lithium carbonate has the characteristics of large space requirements and high energy consumption, resulting in low efficiency and high cost of the entire process plan. , the economic benefits are not significant, and the industrialization value is not great

Method used

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  • Method for recovering lithium from waste lithium ion battery and waste pole piece
  • Method for recovering lithium from waste lithium ion battery and waste pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 2kg of waste lithium cobaltate positive electrode pieces, crush them with a vertical high-speed rotary crusher, sieve them with an 80-mesh standard sieve, and keep the under-sieved materials in a high-temperature electric furnace at 600°C for 4 hours, and the weight of the burned materials is 1.82kg. Add 7L of sodium hydroxide solution with a mass content of 5.0% to the reactor, then slowly add 1.5kg of burnt matter, keep the temperature at about 65°C, continue stirring for 1h, filter, and wash the filter residue to obtain low-aluminum cobaltate lithium filter sludge. Put the low aluminum cobaltate lithium filter sludge in the reactor, add 8L of 2.7mol / L sulfuric acid, slowly add 1.2L of 30% hydrogen peroxide, keep the temperature at about 85°C, keep stirring, react for 1.5h, filter, and measure the leachate The ingredients are as shown in Table 1:

[0025] Table 1. Leaching solution composition

[0026]

[0027] At 85°C, slowly add sodium hydroxide s...

Embodiment 2

[0037] Use a vertical high-speed rotary crusher to crush the waste lithium-ion battery whose positive electrode is nickel-cobalt-lithium manganese oxide. After crushing, use an 80-mesh standard sieve to sieve. Keep 2kg of the sieve in a high-temperature electric furnace at 600°C for 4 hours. It weighs 1.78kg. Add 4.0% 7L sodium hydroxide solution to the reactor, then slowly add 1.5kg of burnt matter, keep the temperature at about 65°C, keep stirring for 1h, filter, and wash the filter residue to obtain low aluminum nickel cobalt lithium manganate and copper lithium carbon pink. Put low aluminum nickel cobalt lithium manganate and copper-containing lithium carbon powder in the reactor, add 8L of 2.8mol / L sulfuric acid, slowly add 1.3L of 30% hydrogen peroxide, keep the temperature at about 85°C, keep stirring, and react for 1.5h. filter. The ingredients in the leachate are measured as shown in Table 5:

[0038] Table 5. Leaching solution composition

[0039]

[0040] A...

Embodiment 3

[0050] Take 2 kg of waste lithium manganese oxide positive electrode, crush it with a vertical high-speed rotary crusher, and then sieve it with an 80-mesh standard sieve. Keep the under-sieved material in a high-temperature electric furnace at 600°C for 4 hours, and the weight of the burned material is 1.81 kg. Add 4.2% 8L sodium hydroxide solution to the 12L reactor, then slowly add 1.5kg of burnt matter, keep the temperature at about 65°C, keep stirring for 1h, filter, and wash the filter residue to obtain low aluminum manganate filter sludge. Put the low alumina lithium manganese oxide filter sludge in the reactor, add 7L of 3.1mol / L sulfuric acid, slowly add 1.4L of 30% hydrogen peroxide, keep the temperature at about 85°C, keep stirring, react for 1.5h, and filter. Components in the leachate are measured as shown in Table 9:

[0051] Table 9. Leaching solution composition

[0052]

[0053] At 85°C, slowly add sodium hydroxide solution to the leaching soluti...

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Abstract

The invention discloses a method for recovering lithium from a waste lithium ion battery and a waste pole piece. The method comprises the following steps of: (1) crushing the waste lithium ion battery or the waste pole piece by using a crusher, placing the crushed material in a high-temperature furnace and removing an adhesive from the crushed material by thermal processing to obtain powder; (2) removing aluminum from the powder by dissolving the aluminum in sodium hydroxide solution and filtering the solution to obtain low-aluminum filter mud; (3) leaching the low-aluminum filter mud with acid and a reducing agent to obtain lixivium; (4) removing impurities such as iron, copper, aluminum and the like from the lixivium by a chemical method; (5) precipitating lithium in the lixivium with fluorine salt to obtain a lithium fluoride rough product; (6) washing the lithium fluoride rough product, filtering and drying to obtain a lithium fluoride product; and (7) returning filtrate obtained after the lithium fluoride rough product is washed to the step (3) for processing. By the method of the invention, the lithium fluoride product has purity of over 98.0 percent and the primary recoveryrate of lithium is between 75 and 92 percent; and the method of the invention has the advantages of simple process, low cost, easy industrial production and high economic benefit.

Description

technical field [0001] The invention relates to a method for recovering lithium from waste lithium ion batteries and waste pole pieces, and belongs to the technical fields of resource recycling and hydrometallurgy. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life. Since their inception, they have been widely used in mobile phones, notebook computers, cameras, digital Cameras and other civilian and military applications. Lithium-ion batteries are consumables, and their cycle life is generally 300 to 500 times, with an average lifespan of 2 to 3 years. Lithium-ion batteries are often discarded due to the rapid update of electronic equipment, and their service life is even shorter. According to statistics, by the end of 2010, there were 54,000 tons of discarded lithium-ion batteries in my country alone, and these waste bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/04C22B26/12
CPCY02P10/20
Inventor 谭群英周汉章唐红辉王皓蒋快良李长东
Owner HUNAN BRUNP RECYCLING TECH
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