由废旧钛酸锂电极材料浸出液制备纳米TiO_2

Preparation of Nano TiO_2 from Leach Liquor of Waste Lithium Titanate Electrode Material

提出了一种从废旧钛酸锂电池中回收钛并制备成纳米TiO2的有效方法。采用尿素作沉淀剂,十二烷基苯磺酸钠(SDBS)作分散剂,采用均相沉淀法制备纳米TiO2,通过称量和扫描电镜(SEM)分析测试手段研究了钛离子浓度、尿素用量、反应温度、反应时间等因素对纳米TiO2的收率和粒径的影响。实验结果表明:钛离子质量浓度为60 g/L,分散剂质量分数为1.5%,n(CO(NH2)2)/n(TiOSO4)为3,反应温度为90℃,时间为2 h条件下,钛的收率达到90%以上。从扫描电镜图中可知,制备的纳米TiO2粒径约为100 nm。该方法为纳米二氧化钛的制备提供了一种新途径。

A promising process for recovering titanium and lithium from waste lithium titanate battery and producing nano TiO2 is proposed. Nano TiO2 is synthesized via homogeneous precipitation with urea as precipitating agent and sodium dodecyl benzene sulfonate（SDBS） as dispersant. The effects of Ti concentration, urea contents, reacting temperature and time on the nano TiO2 production rate and crystal size are studied by weighing and SEM analysis methods. The results indicate that the Ti recovery percentage achieved 90% on the conditions of Ti ion concentration of 60 g/L, SDBS mass fraction of 1.5% and n（CO（NH2）2）/n（TiOSO4） ratio of 3 at 90 ℃ for 2 h. The SEM image of the hydrolyzed product indicates the nano TiO2 particle size is about 100 nm. The approach presents a new way to prepare nanometer titanium dioxide.