Methods for recycling valuable metals

Abstract

This invention provides a novel method for efficiently separating copper (Cu) from battery waste containing Ni, Co, and Cu. [Solution] The method for recycling valuable metals according to the present disclosure includes the steps of roasting waste lithium-ion secondary batteries to obtain a roasted product, and leaching Cu from the roasted product using ammonia water. The waste contains Ni, Co, and Cu. The roasting is carried out such that the roasted product contains Ni and Co as oxides and Cu as a metal.

Claims

1. A process of roasting lithium-ion secondary battery waste to obtain roasted material, The process involves extracting Cu from the roasted material using ammonia water, Includes, The aforementioned waste includes Ni, Co and Cu, The roasting is carried out such that the roasted product contains Ni and Co as oxides and Cu as a metal. Methods for recycling valuable metals.

2. The method according to claim 1, wherein the roasting is performed at a temperature of 150°C to 400°C.

3. The molar ratio of carbon to oxygen in the roasted product is 1 / 2 or more. The method according to claim 1, wherein the roasting is performed in an inert gas atmosphere at a temperature of 150°C to 400°C.

4. The molar ratio of carbon to oxygen in the roasted product is less than 1 / 2. The method according to claim 1, wherein the roasting is performed in an inert gas atmosphere at a temperature of 150°C to 600°C.

5. The method according to claim 1, wherein the waste contains Ni and Co as oxides and Cu as a metal.

6. The method according to claim 1, wherein oxygen is supplied to the ammonia water in the step of leaching Cu.

7. The method according to claim 1, further comprising the step of removing ammonia from the Cu-containing leachate obtained in the step of leaching Cu by volatilization.

8. Sodium hydroxide is added to the Cu-containing leachate obtained in the Cu leaching process to convert the Cu into Cu(OH) ２ The method according to claim 1, further comprising the step of recovering as

9. The method according to claim 1, further comprising the step of performing ammonia leaching on the solid residue obtained in the step of leaching Cu to recover Ni and Co.

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