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US 12,046,727 B2Granted
Method for recovery of valuable metals from spent secondary batteries
AssigneeKorea Zinc Co., Ltd.
InventorsHeon Sik Choi, Tae Hoon Yoon
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Abstract
A method for recovering valuable metals from a spent secondary battery includes a pre-processing process of pre-processing the spent secondary battery, a melting process of heating the pre-processed spent secondary battery to generate a molten solution, and a recovery process of recovering the valuable metals from the molten solution. In the melting process, a chlorinating agent is added, and, in the recovery process, lithium is recovered in a form of lithium dust.
Claims8
A method for recovering valuable metals from a spent secondary battery, the method comprising:
- a pre-processing process of pre-processing the spent secondary battery;
- a melting process of heating the pre-processed spent secondary battery to generate a molten solution;
- and
- a recovery process of recovering the valuable metals from the molten solution,
- wherein, in the melting process, a chlorinating agent is added,
- wherein, in the recovery process, lithium is recovered in a form of lithium dust, and
- wherein a slag generated in the melting process is CaO—SiO2-Al2O3 3-phase slag,
- wherein a composition of the slag is 21-28% CaO, 55-63% SiO2, and 12-17% Al2O3,
- wherein a slag composition analysis process is performed to analyze the composition of the slag generated during the melting process, and
- wherein, based on a composition analysis result of the slag, an additional input amount of flux is adjusted to achieve the slag composition of 21-28% CaO, 55-63% SiO2, and 12-17% Al2O3.
7 more elements
Dependencies are inferred from the claim text.