A method for selectively reclaiming lithium and preparing lithium carbonate from waste lithium batteries

A waste lithium battery, selective technology, applied in battery recycling, waste collector recycling, lithium carbonate;/acid carbonate, etc., can solve the problems of harsh roasting conditions, high roasting temperature, infeasible, etc. Achieve the effect of low cost, high product purity and simple route

Active Publication Date: 2019-10-22
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the roasting temperature of this method is high, the roasting conditions are harsh, and it needs to be carried out under anaerobic conditions, and this method is not feasible for waste lithium batteries with high aluminum content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The positive electrode sheet of the waste battery or the positive electrode sheet of the leftover material is heat-treated to remove the binder, and then the waste lithium battery powder with a particle size of less than 500 meshes is obtained after physical crushing and sieving, wherein the contents of Ni, Co, Cu, Mn, Al, and Li are as follows: As shown in Table 1;

[0060] Take 50g of waste lithium battery powder, add 100mL of nitric acid with a mass fraction of 70%, mix evenly, and then place it at 70°C for nitrate transformation. The transformation time is 2 hours. Calcines of impurity metal oxides and undecomposed lithium nitrate,

[0061] After the calcined sand is cooled, it is divided into 5 parts, and the first part of the calcined sand is mixed with pure water according to the liquid-solid ratio of 5:1, so that the lithium nitrate is dissolved in the water, and the metal oxide is left in the leaching residue, and the solid Lithium-containing filtrate is obtai...

Embodiment 2

[0067] The positive electrode sheet of the waste battery or the positive electrode sheet of the leftover material is heat-treated to remove the binder, and then after physical crushing and screening processes, the waste lithium battery powder with a particle size of less than 500 meshes is obtained, and the contents of Ni, Co, Cu, Mn, Al, and Li are as follows As shown in Table 2;

[0068] Take 50g of waste lithium battery powder, add 110mL of nitric acid with a mass fraction of 70%, mix evenly, and place it at 70°C for nitrate transformation. The transformation time is 3 hours. Calcines of impurity metal oxides and undecomposed lithium nitrate;

[0069] After the calcined sand is cooled, it is divided into 5 parts, and the first part of the calcined sand is mixed with pure water according to the liquid-solid ratio of 5:1, so that the lithium nitrate is dissolved in the water, and the metal oxide is left in the leaching residue, and the solid Lithium-containing filtrate is ob...

Embodiment 3

[0073] The positive electrode sheet of the waste battery or the positive electrode sheet of the leftover material is heat-treated to remove the binder, and then after physical crushing and screening processes, the waste lithium battery powder with a particle size of less than 500 meshes is obtained, and the contents of Ni, Co, Cu, Mn, Al, and Li are as follows Shown in Table 3;

[0074] Take 50g of waste lithium battery powder, 50g of sodium nitrate, and add 50mL of nitric acid with a mass fraction of 70%. After mixing evenly, place it at 120°C for nitrate transformation. The transformation time is 4 hours. After the transformation, the material continues to be placed at 275°C. Roasting for 3 hours to obtain calcined sand containing impurity metal oxides and undecomposed lithium nitrate;

[0075] After the calcined sand is cooled, it is divided into 4 parts, and the first part of the calcined sand is mixed with pure water according to the liquid-solid ratio of 4:1, and the lit...

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Abstract

The invention discloses a method for selectively recovering lithium from waste lithium batteries and preparing lithium carbonate. The method comprises the following steps: mixing waste battery positive electrode powder with a nitrating agent to obtain a mixture, performing a nitration reaction on the mixture to obtain a nitrate product, calcining the nitrate product is at 200-550 DEG C to obtain calcined sands, leaching the calcined sands, performing solid-liquid separation to obtain a lithium-rich filtrate, adjusting the pH value of the lithium-rich filtrate to be 10 or more, performing solid-liquid separation to obtain a purified liquid, adding the purified liquid to a soluble carbonate solution, carrying out a reaction, performing solid-liquid separation, and performing water washing and drying on the obtained filter residues to obtain the lithium carbonate. A principle that the decomposition temperature of lithium nitrate is obviously higher than that of corresponding nitrates of copper, cobalt, aluminum and manganese is ingenious utilized to realize selective separation and recovery of lithium, and the lithium recovery rate in the invention is 20% or above more than that of conventional wet technologies. The high-purity lithium carbonate can be obtained without a complicated purification process, and the method has the advantages of simple process, low cost, high recoveryefficiency of valuable metals, and convenience for industrial production and application.

Description

Technical field: [0001] The invention relates to a method for selectively recovering lithium from waste lithium batteries and preparing lithium carbonate, which belongs to the field of non-ferrous metals. Background technique [0002] At this stage, the new energy industry is strongly supported by national policies, and the lithium battery industry has entered a stage of rapid development. As an important basic raw material for the development of lithium battery new energy, lithium carbonate has an increasing production and demand. Since 2015, the price of lithium carbonate has continued to rise. skyrocketing. [0003] Due to its excellent physical and chemical properties, lithium-ion batteries have become an indispensable power supply for high-tech products such as digital products and electric vehicles. With the continuous increase of the application range of lithium batteries, the number of waste lithium batteries is also increasing. It is estimated that by 2020, the num...

Claims

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Application Information

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IPC IPC(8): H01M10/54C22B26/12C01D15/08
CPCC01D15/08C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 刘付朋汪金良王龙君李明周陈早明彭如振
Owner JIANGXI UNIV OF SCI & TECH
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