CAJ | 학술논문

在硫酸体系中,采用柠檬酸助浸提取赤泥中的钛,以提高钛的浸出效率.考察柠檬酸用量、硫酸浓度、浸出温度、反应时间和液固比等因素对钛浸出率的影响.研究赤泥浸出提钛过程的动力学理论.结果表明:在赤泥浸出过程中添加柠檬酸可显著提高钛的回收率和降低硫酸消耗.通过添加 5%的柠檬酸,钛的浸出率从 65%提高至82%,硫酸消耗降低30%,赤泥中的钙钛矿、板钛矿和赤铁矿更容易溶解溶出.动力学研究表明:赤泥助浸酸浸提钛过程受未反应收缩核模型的扩散步骤控制,线性相关系数大于 0.98.通过添加 5%的柠檬酸,可使赤泥酸浸提钛表观速率常数从0.0012提高至0.0019,表观活化能由39.77 kJ/mol降至 34.61 kJ/mol.
재류산체계중,채용저몽산조침제취적니중적태,이제고태적침출효솔.고찰저몽산용량、류산농도、침출온도、반응시간화액고비등인소대태침출솔적영향.연구적니침출제태과정적동역학이론.결과표명:재적니침출과정중첨가저몽산가현저제고태적회수솔화강저류산소모.통과첨가 5%적저몽산,태적침출솔종 65%제고지82%,류산소모강저30%,적니중적개태광、판태광화적철광경용역용해용출.동역학연구표명:적니조침산침제태과정수미반응수축핵모형적확산보취공제,선성상관계수대우 0.98.통과첨가 5%적저몽산,가사적니산침제태표관속솔상수종0.0012제고지0.0019,표관활화능유39.77 kJ/mol강지 34.61 kJ/mol.
The recovery of titanium with citric acid in sulfuric acid from red mud was put forward to strengthen acid leaching efficiency. The main factors on the recovery of titanium such as citric acid addition, sulfuric acid concentration, leaching temperature, time and liquid-to-solid ratio were studied. The kinetics analysis of titanium leaching from red mud was deeply investigated. The results show that the citric acid could increase the recovery of titanium and decrease the consumption of sulfuric acid. The recovery of titanium was increased from 65% to 82% and the consumption of sulfuric acid was decreased by about 30% with using 5% citric acid. The dissolution of perovskite, brookite, and hematite in red mud could easily be dissolved using citric acid. The acid leaching process was controlled by internal diffusion of shrinking core model (SCM) and the correlation coefficient was above 0.98. The apparent rate constant was increased from 0.0012 to 0.0019 with 5% citric acid at 90 ℃. The apparent activation energy of titanium leaching decreased from 39.77 kJ/mol to 34.61 kJ/mol with 5% citric acid.