METHOD FOR RECOVERING VALUABLE METAL FROM WASTE ELECTRODE MATERIAL OF LITHIUM SECONDARY BATTERY BY USING LITHIUM CARBONATE

• Main Authors: PARK, Jong Sun, BYUN, So Yeong, LEE, Min Woo, KIM, Da Mo A, KIM, Hui Sang, HONG, Jeong Sik, LEE, Gwang Seok, LEE, Myung Gyu, PARK, Suk Joon, PARK, A Ram, SEO, Beom Seok
• Format: Patent
• Language: English; French; Korean
• Published: 02.12.2021
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; INORGANIC CHEMISTRY; METALLURGY; PRETREATMENT OF RAW MATERIALS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The present invention relates to a method for recovering a valuable metal and, more specifically, to a method for recovering a valuable metal from a waste electrode material of a lithium secondary battery by using lithium carbonate. The method may: pre-process a positive electrode-negative electrode mixed electrode material that has been separated by draining, crushing, screening, and sorting a waste lithium secondary battery; perform a precipitation step, by using lithium carbonate (Li2CO3), to a metal melt acquired by performing sulfuric acid dissolution using sulfuric acid; recover a valuable metal such as nickel, cobalt, manganese, aluminum, and copper as a residue in the form of a carbonate composite; and recover, as a filtrate, a lithium sulfate (Li2SO4) aqueous solution comprising lithium. La présente invention concerne un procédé de récupération d'un métal précieux et, plus spécifiquement, un procédé de récupération d'un métal précieux à partir d'un matériau de déchet d'électrode d'une batterie secondaire au lithium à l'aide de carbonate de lithium. Le procédé peut : pré-traiter un matériau d'électrode mixte d'électrode négative-positive qui a été séparé par drainage, broyage, criblage et tri d'une batterie secondaire au lithium-ion ; effectuer une étape de précipitation, en utilisant du carbonate de lithium (Li2CO3), sur une masse fondue métallique acquise par la réalisation d'une dissolution d'acide sulfurique à l'aide d'acide sulfurique ; récupérer un métal précieux tel que le nickel, le cobalt, le manganèse, l'aluminium et le cuivre en tant que résidu sous la forme d'un composite de carbonate ; et récupérer, en tant que filtrat, une solution aqueuse de sulfate de lithium (Li2SO4) comprenant du lithium. 본 발명은 유가금속의 회수 방법에 관한 것으로, 보다 구체적으로는 폐리튬 이차전지를 방전, 파쇄, 선별, 분급하여 분리된 양극-음극 혼합 전극소재를 전처리하고, 황산을 이용하여 황산용해시켜 수득된 금속용해물에 탄산리튬(Li2CO3)을 이용하여 침전단계를 수행하여, 니켈, 코발트, 망간, 알루미늄 및 구리등의 유가금속은 복합 탄산염 형태의 잔사로 회수해내고, 리튬을 포함하는 황산리튬(Li2SO4) 수용액은 여액으로 회수해낼 수 있는 리튬이차전지의 폐전극소재로부터 탄산리튬을 이용한 유가금속의 회수 방법에 관한 것이다.