Removal of zirconium from hydrous titanium dioxide
来源期刊：International Journal of Minerals Metallurgy and Materials2013年第1期
论文作者：Xue-qin Ma Ya-hui Liu Jing-long Chu Jie Li Tian-yan Xue Li-na Wang Tao Qi
文章页码：1 - 8
摘 要：A method was proposed for removing zirconium (Zr) from hydrous titanium dioxide (HTD) by the NaF solution. The effects of main parameters, i.e. pH values, NaF dosage, temperature and retention time, on the removal of zirconium were studied. The optimal conditions were found as the following: pH value, <5.5; molar ratio of NaF to TiO2, 0.6; retention time, 80 min; and temperature, 80°C. The removal rate of Zr under the optimized conditions was above 87.7%. The adsorption energy of the preferential absorption of hydrofluoric acid for Zr(OH)2SO4(OH2) on the (001) crystal surface of HTD was determined by theoretical calculation. The possible mechanism of the removal process was also discussed.
Xue-qin Ma1,2,3，Ya-hui Liu1,2，Jing-long Chu1,2，Jie Li1,2，Tian-yan Xue1,2，Li-na Wang1,2，Tao Qi1,2
1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences2. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences3. Graduate University of Chinese Academy of Sciences
摘 要：A method was proposed for removing zirconium (Zr) from hydrous titanium dioxide (HTD) by the NaF solution. The effects of main parameters, i.e. pH values, NaF dosage, temperature and retention time, on the removal of zirconium were studied. The optimal conditions were found as the following: pH value, <5.5; molar ratio of NaF to TiO2, 0.6; retention time, 80 min; and temperature, 80°C. The removal rate of Zr under the optimized conditions was above 87.7%. The adsorption energy of the preferential absorption of hydrofluoric acid for Zr(OH)2SO4(OH2) on the (001) crystal surface of HTD was determined by theoretical calculation. The possible mechanism of the removal process was also discussed.
关键词：
