N235从黏土钒矿酸浸液中萃钒的数学建模与分析

Mathematical modeling and analysis of vanadium extraction from acid leaching solution of clay vanadium ore with N235

以N235从黏土钒矿酸浸液中提钒的条件试验为基础,主要研究溶剂萃取过程中影响萃取率的因素,确定了pH、萃取剂浓度、相比对萃取率的影响,而后运用响应曲面法确立了三个因素之间的交互效应,并且运用热力学、溶液化学分析了交互作用产生的原因,指出萃取体系中pH与硫元素会极大地影响溶液中的含钒组分,进而影响萃取率,同样含钒组分的变化也会影响萃取效率。总之,萃取体系产生交互作用的核心机理为pH变化引起溶液组分的变化以及萃取剂面对不同离子时所表现的差异性。

Based on the experiments of extracting vanadium from acid leaching solution of clay vanadium ore with N235,the factors influencing the extraction rate were studied.The influences of pH value,extractant concentration and phase ratio on the extraction rate were determined.The interaction effect during the three factors was determined by response surface methodology.The causes of interaction were analyzed by thermodynamics and solution chemistry.It is shown that the pH value and sulfur content in the extraction system greatly affect the vanadium components in the solution,and then affect the extraction rate.Meanwhile,the change of vanadium components also affects the extraction rate.Conclusively,the core mechanism of the interaction of the extraction system is the change of solution compositions caused by pH variation and the difference of extractant when facing different ions.