碱性体系下萃取钒的研究

Vanadium extraction from alkalinity system

研究了以季铵盐三辛基甲基氯化铵(MOTAC)为萃取剂在碱性体系条件下萃取钒的过程.考察了萃取剂浓度、有机相组成、pH值、震荡时间、相比等因素对萃取钒过程的影响.结果表明,在pH值为11.5左右条件下,有机相组成按质量比为15%MTOAC+3.5%仲辛醇+81.5%磺化煤油,相比为1∶1,震荡反应5 min,钒的单级萃取率达到90%以上;负载有机相用0.5 mol/L NaCl+1.0 mol/L NaOH溶液进行反萃,单级反萃率为95%以上.

This paper studies the vanadium extraction process from alkaline system with the MTOAC as the extractant. The effects of the following factors including extractant concentration, organic phase composition, pH value, oscillation time and phase ratio on vanadium extraction are investigated. The results show that the single stage extraction rate of vanadium reaches higher than 90 % in the following conditions： pH=l 1.5, the organic phase comprising 15 % MTOAC＋3.5 % DL-2-oetanol＋81.5 % sulfonated kerosene, the phase ratio= 1.0, oscillation time =5 rain .With the solution of containing 0.5 mol/L NaCl＋l.0mol/L NaOH as the stripping system, more than 95 % of the single stage stripping rate of the loaded organic phase can be obtained.