DE-SODIUM FROM EXTRACTED VANADIUM TAILINGS USING HYDROTHERMAL TREATMENT
Vanadium can be effectively extracted from vanadium slag using sodium salts/hydroxide as reaction media. During the vanadium extraction processes, due to the formation of water insoluble sodium containing substances, significant amount of sodium is lost in the tailings. And the tailings can not be used as the construction material for its high sodium content. A strategy of de-sodium from the tailings was proposed in this study by investigating the phases of sodium containing substances in the extracted vanadium tailings. The sodium may exist mainly as Na2O·Al2O3·1.7SiO2, and can be replaced by calcium due to the formation of thermodynamically more stable 3CaO·Al2O3·xSiO2·(6-2x)H2O. Our preliminary experimental results show that by adding lime into vanadium tailings during hydrothermal treatment, the mass fraction of Na2O in tailings could be lowered from 6-10％ to 1％, and the dissolved alkali can be recovered in the form of sodium hydroxide. Thus, the final tailings can be used as construction materials.
vanadium vanadium tailings hydrothermal method de-sodium
Biao Liu Hao Du Shili Zheng Shaona Wang Yi Zhang
Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China Graduate University of Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
国际会议
北京
英文
1221-1227
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）