Method for producing lithium-rich pure solution from waste lithium ion battery positive electrode active material

Abstract

The invention discloses a method for producing a lithium-rich pure solution from a waste lithium ion battery positive electrode active material, belongs to the technical field of waste lithium ion battery material recycling, and particularly provides a method for producing a lithium-rich pure solution from a reduced sulfuric acid leaching solution of a positive electrode active material. A high-sodium and low-lithium lithium sulfate solution obtained after the positive electrode active material is subjected to reduction leaching and leaching solution purification is subjected to lithium deposition with phosphoric acid or phosphate to obtain lithium-containing phosphate enrichment; lithium is selectively leached out from the lithium-containing phosphate enrichment by using less than a theoretically required amount of a calcium chloride solution to obtain the lithium-rich pure solution and lithium-containing phosphorus-calcium residues; and the lithium-containing pure solution is used for producing a product such as battery-grade lithium carbonate or lithium chloride through a conventional method such as deposition or crystallization, and a solution obtained after the lithium-containing phosphorus-calcium residues are subjected to sulfuric acid leaching and neutralization returns to the lithium deposition step for cyclic use. According to the method, the lithium-rich pure solution can be directly produced from the high-sodium and low-lithium solution without pre-concentration, the energy consumption and the cost are low, and the lithium recycling rate is high.

Description

technical field

[0001] The invention belongs to the technical field of recycling waste lithium ion battery materials, and in particular relates to a method for producing lithium-rich net liquid from the positive electrode active material of waste lithium ion batteries. Background technique

[0002] Due to its high working voltage and specific energy, stable discharge voltage, light weight and small size, long cycle life, and no memory effect, lithium-ion batteries are widely used in portable devices, electric vehicles, power reserves, satellites and other fields. With the advancement of lithium-ion battery technology and the increase in output, its waste is also increasing year by year. The lifespan of lithium-ion batteries is generally 3 to 5 years. At present, the recycling system has not yet reached a large scale, and the recovery rate is low. Most of the waste lithium-ion batteries have not been effectively treated, which not only pollutes the environment, but also waste...

Examples

Embodiment 1

[0025] Take 200g of ternary battery positive electrode material containing 28.3% nickel, 10.63% cobalt, 11.75% manganese and 6.50% lithium, according to the acid ore mass ratio of 2:1, the hydrogen peroxide volume mass ratio of 1:1, the leaching solid-liquid mass-to-volume ratio 1:10, the leaching time is 1h for sulfuric acid reduction leaching; the leaching solution is adjusted by 30% NaOH solution to adjust the pH value to remove iron. Add sodium phosphate to the nickel extraction raffinate according to 1.2 times the theoretical amount of lithium moles. At 90°C, stir and react for 1 hour to obtain lithium-containing phosphate, the lithium precipitation rate is 96%, and the lithium-containing liquid contains 0.01 g / L; Lithium-containing phosphate concentrate is leached by 200g / L calcium chloride solution, leaching temperature is 90°C, leaching time is 2h, leaching solid-liquid mass to volume ratio is 1:8, lithium leaching rate is 98%, lithium-containing leaching solution The ...

Embodiment 2

[0027]Take 200g of ternary battery cathode material containing 28.3% nickel, 10.63% cobalt, 11.75% manganese and 6.50% lithium. The ratio of liquid mass to volume is 1:10, and the leaching time is 1h for leaching; the leaching liquid is leached through 30% NaOH solution to adjust the pH value to remove iron. Nickel extraction; add sodium phosphate to the nickel extraction raffinate according to 1.2 times the theoretical amount of lithium moles, stir and react for 1.5h at 90°C, the lithium precipitation rate is 96.5%, and the lithium-containing phosphate concentrate is obtained by solid-liquid separation , the lithium-containing phosphate concentrate was leached by 300g / L calcium chloride solution, the leaching temperature was 90°C, the leaching time was 1.5h, the leaching solid-liquid mass to volume ratio was 1:5, the lithium leaching rate was 98.5%, and the lithium-containing leaching solution contained lithium The concentration is about 22.5g / L.

Embodiment 3

[0029] Take 200g of ternary battery cathode material containing 28.3% nickel, 10.63% cobalt, 11.75% manganese and 6.50% lithium, mix the cathode material, concentrated sulfuric acid, and anthracite in proportion, wherein the amount of sulfuric acid added is based on the mass ratio of sulfuric acid to the cathode material 2: 1. The amount of anthracite added is 20% of the mass of the positive electrode material, the roasting temperature is 300°C, and the roasting time is 2 hours; the clinker is leached with water, the leached solid-liquid mass to volume ratio is 1:5, 1% hydrogen peroxide is added, the leaching time is 1 hour, nickel-cobalt The leaching rate of lithium is greater than 95%. The leaching solution adjusts the pH value with 30% NaOH solution to remove iron. Sodium phosphate is added to the solution according to 1.2 times the theoretical amount of lithium moles, and the reaction is stirred for 1 hour at 90°C, and the lithium precipitation rate is 95.5%. The concentra...

technical field

[0001] The invention belongs to the technical field of recycling waste lithium ion battery materials, and in particular relates to a method for producing lithium-rich net liquid from the positive electrode active material of waste lithium ion batteries. Background technique

[0002] Due to its high working voltage and specific energy, stable discharge voltage, light weight and small size, long cycle life, and no memory effect, lithium-ion batteries are widely used in portable devices, electric vehicles, power reserves, satellites and other fields. With the advancement of lithium-ion battery technology and the increase in output, its waste is also increasing year by year. The lifespan of lithium-ion batteries is generally 3 to 5 years. At present, the recycling system has not yet reached a large scale, and the recovery rate is low. Most of the waste lithium-ion batteries have not been effectively treated, which not only pollutes the environment, but also waste...

Examples

Embodiment 1

[0025] Take 200g of ternary battery positive electrode material containing 28.3% nickel, 10.63% cobalt, 11.75% manganese and 6.50% lithium, according to the acid ore mass ratio of 2:1, the hydrogen peroxide volume mass ratio of 1:1, the leaching solid-liquid mass-to-volume ratio 1:10, the leaching time is 1h for sulfuric acid reduction leaching; the leaching solution is adjusted by 30% NaOH solution to adjust the pH value to remove iron. Add sodium phosphate to the nickel extraction raffinate according to 1.2 times the theoretical amount of lithium moles. At 90°C, stir and react for 1 hour to obtain lithium-containing phosphate, the lithium precipitation rate is 96%, and the lithium-containing liquid contains 0.01 g / L; Lithium-containing phosphate concentrate is leached by 200g / L calcium chloride solution, leaching temperature is 90°C, leaching time is 2h, leaching solid-liquid mass to volume ratio is 1:8, lithium leaching rate is 98%, lithium-containing leaching solution The ...

Embodiment 2

[0027]Take 200g of ternary battery cathode material containing 28.3% nickel, 10.63% cobalt, 11.75% manganese and 6.50% lithium. The ratio of liquid mass to volume is 1:10, and the leaching time is 1h for leaching; the leaching liquid is leached through 30% NaOH solution to adjust the pH value to remove iron. Nickel extraction; add sodium phosphate to the nickel extraction raffinate according to 1.2 times the theoretical amount of lithium moles, stir and react for 1.5h at 90°C, the lithium precipitation rate is 96.5%, and the lithium-containing phosphate concentrate is obtained by solid-liquid separation , the lithium-containing phosphate concentrate was leached by 300g / L calcium chloride solution, the leaching temperature was 90°C, the leaching time was 1.5h, the leaching solid-liquid mass to volume ratio was 1:5, the lithium leaching rate was 98.5%, and the lithium-containing leaching solution contained lithium The concentration is about 22.5g / L.

Embodiment 3

[0029] Take 200g of ternary battery cathode material containing 28.3% nickel, 10.63% cobalt, 11.75% manganese and 6.50% lithium, mix the cathode material, concentrated sulfuric acid, and anthracite in proportion, wherein the amount of sulfuric acid added is based on the mass ratio of sulfuric acid to the cathode material 2: 1. The amount of anthracite added is 20% of the mass of the positive electrode material, the roasting temperature is 300°C, and the roasting time is 2 hours; the clinker is leached with water, the leached solid-liquid mass to volume ratio is 1:5, 1% hydrogen peroxide is added, the leaching time is 1 hour, nickel-cobalt The leaching rate of lithium is greater than 95%. The leaching solution adjusts the pH value with 30% NaOH solution to remove iron. Sodium phosphate is added to the solution according to 1.2 times the theoretical amount of lithium moles, and the reaction is stirred for 1 hour at 90°C, and the lithium precipitation rate is 95.5%. The concentra...

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