P2O4萃取硫酸体系中V(Ⅳ)、Fe(Ⅲ)的分离性能研究

针对传统提钒技术存在的能耗高、污染重、钒回收率低等缺点,提出钛白废酸无焙烧加压酸浸提钒新技术,以该工艺浸出液为研究对象,通过组分优势区域图、正交试验以及单因素试验,探究P204萃取硫酸体系中V(Ⅳ)、Fe(Ⅲ)的分离性能.试验结果表明:当pH小于2时,V(Ⅳ)在水溶液中主要以VO2+形式存在,Fe(Ⅲ)在水溶液中主要以Fe3+形式存在;相比(O/A)是影响V(Ⅳ)、Fe(Ⅲ)萃取率的重要因素;在较优萃取条件下:有机相组成30％P204+10％ TBP+60％磺化煤油,温度T=30℃,震荡时间8min,水相初始pH值为1.6,相比(O/A)为3,V(Ⅳ)的萃取率为61.16％,Fe(Ⅲ)的萃取率为18.87％,钒铁分离系数为6.67.

Study on Separation Performance of V (Ⅳ) and Fe (Ⅲ) by P2O4 in Sulfuric Acid Extraction System

Aiming at the shortcomings of high energy consumption,heavy pollution and low recovery rate for the traditional vanadium production technologies,a new process for vanadium extraction by acid leaching using the waste acid in titanium white production under the pressure without roasting was proposed.In this paper,the leaching solution was taken as the research object.Component area map,orthogonal tests and single factor tests had been used to research the separation performance of V (Ⅳ) and Fe (Ⅲ) in P204 sulfuric acid extraction system.The experimental results show that V (Ⅳ) and Fe (Ⅲ) respectively exist in the main form of VO2+ and Fe3+ in aqueous solution when the pH is less than 2,and the phase ra tio (O/A) is an important factor affecting the extraction rates of V(Ⅳ) and Fe(Ⅲ).At the optimum extraction conditions of 30％ P204+ 10％ TBP+60％ sulfonated kerosene for organic phase composition,extraction temperature T=30 ℃,shaking for 8 min,1.6 for the initial aqueous phase pH and phase ratio (O/A) =3,the extraction rates of V(Ⅳ) and Fe(Ⅲ) are respectively 61.16％ and 18.87％,with the separation factor of V (Ⅳ) and Fe (Ⅲ) at 6.67.