Method for recovering lithium from waste lithium secondary battery by pyrogenic smelting method

• Main Authors: LI HAOZHU, MOON NAM-IL, KIM EUNG-BAE
• Format: Patent
• Language: Chinese; English
• Published: 07.03.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention relates to a method for recovering lithium from a waste lithium secondary battery using a pyrometallurgy method, comprising the steps of melting a waste lithium secondary battery containing nickel, cobalt, copper and lithium, a flux having a melting temperature of 1,400 DEG C or less, and a lithium recovery agent to separate and obtain a slag, a metal phase and a lithium compound, wherein the lithium recovery agent comprises at least one of chlorine and fluorine wherein the respective amounts of nickel, cobalt and copper contained in the metal phase are more than 10 times as compared to the amounts in the slag. 本发明涉及一种利用火法熔炼方法从废旧锂二次电池中回收锂的方法，其包括熔化含有镍、钴、铜和锂的废旧锂二次电池，熔化温度为1,400℃以下的熔剂，以及锂回收剂以分离并获得熔渣、金属相和锂化合物的步骤，其中锂回收剂包含氯和氟中的至少一种，其中金属相中所含的镍、钴和铜各自的量与熔渣中的量相比超过10倍。