Lithium-containing slag and method for producing valuable metals

Abstract

To provide Li-containing slag which is obtained by melting starting materials such as waste lithium ion batteries containing Li and Al, and which enables effective control of a slag melting point to be under a specific temperature while suppressing the amount of flux addition, abd also enables effective concentration of Li while suppressing the amount of slag.SOLUTION: The present invention provides Li-containing slag which is obtained by melting starting materials that include waste lithium ion batteries containing lithium (Li) and aluminum (Al). The Li-containing slag satisfies the relational expressions Al / Li<5 and silicon (Si) / Li<0.7 in terms of the mass ratio and contains 30 mass% or less of Al, 6 mass% or more of Mn, 3 mass% to 20 mass% of Li, and 0 mass% to 7 mass% of Si.SELECTED DRAWING: None

Claims

1. Li-containing slag obtained by melting raw materials including waste lithium-ion batteries containing lithium (Li) and aluminum (Al), In terms of mass ratio, Al / Li < 5 and silicon (Si) / Li < 0.

7. Al is 30% by mass or less. Mn at a concentration of 6% by mass or more, 3% by mass or more and 20% by mass or less of Li, It contains Si in a proportion of 0% by mass or more and 7% by mass or less. Li-containing slag.

2. The relationship Si / Li < 0.35 is observed in terms of mass ratio. Li-containing slag according to claim 1.

3. A method for producing valuable metals from raw materials including waste lithium-ion batteries containing lithium (Li) and aluminum (Al), A pretreatment step including a process to remove the outer container made of Al from the raw material, The process includes a melting step in which the raw materials obtained through the aforementioned pretreatment step are melted to obtain Li-containing slag and metal containing valuable metals. The Li-containing slag obtained in the melting process is In terms of mass ratio, Al / Li < 5 and silicon (Si) / Li < 0.

7. Al is 30% by mass or less. Mn at a concentration of 6% by mass or more, 3% by mass or more and 20% by mass or less of Li, It contains Si in a proportion of 0% by mass or more and 7% by mass or less. A method for manufacturing valuable metals.

4. In the melting process, the partial pressure of oxygen in the molten material is 10 －１４ atm over 10 －１１ Control it so that it is below atm. The method for producing a valuable metal according to claim 3.

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