Method for recovering lithium chloride and titanium dioxide from lithium titanate waste

• Main Authors: XIAO YINGYI, OUYANG XI, ZHOU YOUCHI, WEN XIAOQIANG, GUO CHUNPING, LIU WENWEN, ZHOU XINHUA, LUO LINSHAN, WANG YUXIANG, YUAN DELIN, ZHANG FAN, PU JIAN
• Format: Patent
• Language: Chinese; English
• Published: 18.09.2018
• Subjects: BASIC ELECTRIC ELEMENTS; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention discloses a method for recovering lithium chloride and titanium dioxide from lithium titanate waste, which comprises the following steps: calcining lithium titanate waste for 1-5 hours at 200-500 DEG C; then leaching the calcined material with hydrochloric acid and hydrogen peroxide, and filtering to obtain titanium-containing filter residue and lithium-containing filtrate; directlycalcining the titanium-containing filter residue for 2-8 hours at 600-1000 DEG C to obtain titanium dioxide; adding lithium hydroxide to the lithium-containing filtrate, adjusting the pH of the filtrate within the range of 6-11, and performing deep removal of impurity and filtering; and evaporating, concentrating, crystallizing and drying the filtration obtained by filtering to obtain obtain lithium chloride. The purity of the lithium chloride product obtained by the method of the invention is more than 99%, the recovery rates of lithium and titanium are both greater than 85%, the process of the method is simple, the