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Valuable metal leaching system and leaching method in a kind of waste lithium battery

A technology for waste lithium batteries and valuable metals, which is applied in battery recycling, waste collector recycling, and process efficiency improvement, to achieve innovative and outstanding advantages, less equipment corrosion, and good application prospects.

Active Publication Date: 2020-03-10
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention uses sulfamic acid-glucose system to realize the leaching of valuable metals in waste lithium batteries, which has not been reported at home and abroad

Method used

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  • Valuable metal leaching system and leaching method in a kind of waste lithium battery
  • Valuable metal leaching system and leaching method in a kind of waste lithium battery
  • Valuable metal leaching system and leaching method in a kind of waste lithium battery

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Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: the leaching of lithium, cobalt in the waste lithium cobalt oxide battery

[0033] After pretreatment such as dismantling and crushing of waste lithium cobalt oxide batteries, the positive electrode powder is separated. The positive electrode powder contains 5.37% Li and 57.73% Co, mainly LiCoO 2 Morphological existence ( figure 1 ). Prepare 100mL sulfamic acid-glucose mixed solution (sulfamic acid concentration 1.5mol / L, glucose 50g / L) and pour it into a 250mL Erlenmeyer flask. After the leaching solution was preheated to 80° C., 5 g of positive electrode powder (solid-to-liquid ratio 50 g / L) was added, and the leaching reaction was carried out under the condition of magnetic stirring (600 rpm). Under different leaching time conditions, the leaching rate of lithium and cobalt in the positive electrode powder of waste lithium cobalt oxide battery changes as follows: figure 2 shown.

Embodiment 2

[0034] Embodiment 2: the leaching of lithium, cobalt, nickel, manganese in the waste ternary lithium battery

[0035] After the waste ternary lithium battery is disassembled, crushed and other pretreatments, the positive electrode powder is separated. The positive electrode powder contains Li 7.38%, Co14.52%, Ni 35.03%, and Mn 18.63%, mainly in the form of lithium-cobalt-nickel-manganese-oxygen complex ( image 3). Prepare 100mL sulfamic acid-glucose mixed solution (sulfamic acid concentration 1.5mol / L, glucose 40g / L), and pour it into a 250mL Erlenmeyer flask. After the leaching solution was preheated to 80°C, 4g of positive electrode powder (solid-to-liquid ratio: 40g / L) was added, and the leaching reaction was carried out under the condition of magnetic stirring (500rpm). Under different leaching time conditions, the leaching rates of lithium, cobalt, nickel, and manganese in the positive electrode powder of waste ternary lithium batteries change as follows: Figure 4 sh...

Embodiment 3

[0036] Embodiment 3: the leaching of lithium, cobalt, nickel, manganese in the waste ternary lithium battery

[0037] After the waste ternary lithium battery is disassembled, crushed and other pretreatments, the positive electrode powder is separated. The positive electrode powder contains 7.38% Li, 14.52% Co, 35.03% Ni, and 18.63% Mn. Prepare 100mL sulfamic acid-glucose mixed solution (sulfamic acid concentration 1.2mol / L, glucose 50g / L) and pour it into a 250mL Erlenmeyer flask. After the leaching solution was preheated to 85°C, 5g of positive electrode powder (solid-to-liquid ratio: 50g / L) was added, and the leaching reaction was carried out under the condition of magnetic stirring (500rpm). After leaching for 2 hours, the leaching rates of lithium, cobalt, nickel, and manganese in the positive electrode powder of waste ternary lithium batteries were 97.18%, 95.41%, 95.83%, and 95.29%, respectively.

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Abstract

The invention belongs to the field of waste battery resource recycling, and discloses a leaching system and leaching method for valuable metal in a waste lithium battery. According to the leaching method, a sulfamic acid-glucose leaching agent is pre-heated, positive electrode powder is added, and stirring and leaching in a reaction kettle are performed, Co (III) and Mn (IV) are reduced to Co (II)and Mn (II) which are dissolved in a leaching liquid with Li<+> and Ni<2+>, Li, Co, Ni and Mn leaching rate in the waste battery positive electrode powder can reach 95% or above, and recycling or reusing of Li, Co, Ni and Mn can be achieved after further processing the leaching liquid. Compared with a traditional leaching liquid, the leaching system has the advantages of greenness, environmentalfriendliness, safe and controllable leaching process and relatively good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of waste battery resource recovery, and in particular relates to a high-efficiency leaching system and method for valuable metals such as lithium, cobalt, nickel and manganese in waste lithium ion batteries. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, low self-discharge rate, no memory effect, and high working voltage. They are widely used as key components of portable electronic products and new energy vehicles, but they are also consumables. By 2015, the annual consumption of lithium batteries in China has reached 6 billion, and the annual consumption is growing exponentially. It is predicted that by 2020, the amount of scrapped power lithium-ion batteries in my country will reach 500,000 tons. [0003] Waste lithium batteries contain lithium, cobalt, manganese, nickel and other valuable metals, which belong to "secondary resources". The content of lithium, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C22B7/00
CPCC22B7/007H01M10/54Y02P10/20Y02W30/84
Inventor 王云燕柯勇王天宇汤依伟闵小波柴立元刘恢万承平梁彦杰
Owner CENT SOUTH UNIV
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