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Method for recovering valuable metals from spent lithium-ion batteries

A lithium-ion battery, valuable metal technology, applied in the direction of improving process efficiency, etc., can solve the problems of low nickel-cobalt-manganese recovery rate, high cost, increase manufacturing cost, etc., and achieve the effect of saving leaching cost

Active Publication Date: 2012-07-04
HUNAN BRUNP RECYCLING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method shortcoming has three: 1) contain nickel, cobalt, manganese more than 2% in most of iron and the small part copper of screening, cause the recovery rate of nickel cobalt manganese to be low; 2) the aluminum in this method battery and unselected Most copper will consume a large amount of auxiliary materials, resulting in high cost; 3) adding hydrogen peroxide or sodium sulfite as reducing agent in the leaching process increases the manufacturing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 183.09g of waste lithium cobalt oxide battery model 18650, dry it in a rotary kiln at 350°C for 30 minutes, crush it through a 120-mesh standard sieve, and separate 36.53g of iron slag and 65.76g of remaining non-magnetic matter from the sieve by magnetic separation. , and the undersieve was 56.33g. The content of each component is as follows in Table 1:

[0026] Table 1

[0027] name

[0028] The non-magnetic material was leached by 6.0mol / L ammonium sulfate solution with a liquid-solid ratio of 10:1, 95°C for 3 hours, and filtered to obtain 39.55g of copper-aluminum slag and a primary leaching solution. Copper-aluminum slag can be used as raw material for copper metallurgy industry. The content of each metal element in copper-aluminum slag is shown in Table 2:

[0029] Table 2

[0030] name

[0031] Hydrogen sulfide was passed through the primary leaching solution to precipitate cobalt-copper to obtain 22.75 g of cobalt-copper mixed sulfide...

Embodiment 2

[0036] Take 187.4g of 18650 nickel-cobalt lithium manganate battery, dry it at 350°C for 30min, crush it through a 120-mesh sieve, and get 39.0g of iron slag, 77.8g of non-magnetic material, and 70.3g of under-sieve material after magnetic separation . The content of each component is as follows in Table 4:

[0037] Table 4

[0038] name

[0039] The non-magnetic material was leached by 6.0mol / L ammonium sulfate solution with a liquid-solid ratio of 8:1, 95°C for 3 hours, and filtered to obtain 46.08g of copper-aluminum slag and a primary leaching solution. Copper-aluminum slag can be used as raw material for copper metallurgy industry. The content of each metal element in copper-aluminum slag is shown in Table 5:

[0040] table 5

[0041] name

[0042] Pass hydrogen sulfide into the primary leaching solution to precipitate cobalt-copper to obtain 30.63 grams of mixed sulfides such as nickel-cobalt-copper. The sieved cobalt-copper mixed sulfide is mixed...

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PUM

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Abstract

The invention discloses a method for recovering valuable metals from spent lithium-ion batteries. The valuable metals comprise nickel, cobalt, manganese, copper and ferrum. According to the method, the valuable metals, such as the nickel, the cobalt, the manganese, the copper and the ferrum, are recovered through the following steps of baking, sieving, magnetic separation, leaching, purification, crystallization and the like by taking the spent lithium-ion batteries as raw materials. The method disclosed by the invention has the characteristics that the disposal cost is low; the recovery rate of the nickel, the cobalt, the manganese, the copper and the ferrum is high; and greater economic benefits and social benefits can be generated.

Description

technical field [0001] The invention belongs to the fields of hydrometallurgy and recycling of waste resources, and in particular relates to the preliminary separation and purification technology of waste lithium ion batteries. Background technique [0002] The recycling methods of lithium-ion secondary batteries can be summed up in the following three ways. [0003] 1. Roasting method. The positive electrode material obtained by manually dismantling the waste lithium-ion battery is put into the roaster for reduction and roasting, and the metal cobalt and lithium oxide are reduced, and the lithium oxide is evaporated and recycled. The metal cobalt and aluminum are made into a carbon-containing alloy, and then the alloy is separated and extracted. Cobalt salt, nickel salt, etc., but this method consumes too much energy. [0004] 2. Flotation electrolysis. The positive electrode active material obtained by manually dismantling the waste lithium-ion battery is subjected to h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00
CPCY02P10/20
Inventor 李达飞谭群英唐红辉蒋快良
Owner HUNAN BRUNP RECYCLING TECH
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