Lithium recovery process of waste lithium ion batteries

• Main Authors: ZHONG FAPING, HUANG LINBO, YANG XIANFENG
• Format: Patent
• Language: Chinese; English
• Published: 01.11.2019
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; 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 invention provides a lithium recovery process of waste lithium ion batteries. The process comprises the following steps of firstly crushing the waste lithium ion batteries and then sorting out toobtain positive and negative electrode active material powder and diaphragms; placing the sorted positive and negative electrode active material powder and diaphragms in a roasting furnace for roasting for a certain period of time based on a certain mass ratio at the temperature of 600 DEG C-650 DEG C; leaching roasting product through using oxalic acid solution and then filtering to obtain nickel-cobalt-manganese slag and lithium oxalate solution; adding calcium hydroxide into the lithium oxalate solution for reaction, and filtering to obtain lithium hydroxide solution and calcium oxalate; and finally, adding sulfuric acid into the obtained calcium oxalate for acidifying treatment, and then filtering to obtain oxalic acid solution. The method has the advantages of being simple and novel in process and high in the