METHOD OF RECOVERING LITHIUM FROM LITHIUM-CONTAINING WASTE LIQUID

• Main Authors: JEUNG KEE UEK, KIM HYUN SOO, KWON YOUNG SU, CHOI SANGHYEON
• Format: Patent
• Language: English; Korean
• Published: 25.06.2024
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

본 발명은 리튬 함유 폐액으로부터 리튬을 회수하는 방법에 관한 것으로, 양극재 수세액을 여과하여 염기성 폐액에 포함된 고형분의 금속을 분리하는 단계, 상기 고형분의 금속을 여과한 상기 양극재 수세액에 황산을 투입하여 산성화하고 탄산 리튬 또는 수산화 리튬을 황산 리튬으로 전환시키는 단계, 상기 황산 리튬으로 전환된 수세액을 농축시켜 고농도의 황산 리튬 용액을 수득하는 단계, 및 상기 고농도의 황산 리튬 용액을 광석으로부터 침출된 결과물에 혼입시키는 단계를 포함할 수 있다. The present invention relates to a method for recovering lithium from a lithium-containing waste liquid, and the method may comprise the steps of: filtering a positive electrode material washing solution so as to separate a solid metal included in a basic waste liquid; adding sulfuric acid to the positive electrode material washing solution from which the solid metal has been filtered so as to acidify same, and converting lithium carbonate or lithium hydroxide into lithium sulfate; concentrating the washing solution that has been converted into lithium sulfate so as to obtain a high concentration lithium sulfate solution; and incorporating the high concentration lithium sulfate solution into a resulting product leached from an ore.