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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VO~(2+)形式存在,Fe(Ⅲ)在水溶液中主要以Fe~(3+)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8 min,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。
Aiming at the shortcomings of high energy consumption, heavy pollution and low vanadium recovery rate of traditional vanadium extraction technology, a new technology of vanadium extraction from titanium dioxide waste acid without roasting and pressurized acid is proposed. The leaching solution of this process is taken as the research object, The orthogonal test and single factor test were used to investigate the separation performance of V (Ⅳ) and Fe (Ⅲ) in P204 extraction sulfuric acid system. The results show that when pH is less than 2, V (Ⅳ) exists mainly in the form of VO ~ (2+) in aqueous solution, while Fe (Ⅲ) exists mainly in the form of Fe ~ (3+) / A) is an important factor affecting the extraction rate of Fe (Ⅲ) and Fe (Ⅲ). Under the optimal extraction conditions, the organic phase consisted of 30% P204 + 10% TBP + 60% When the shaking time was 8 min, the initial pH of the aqueous phase was 1.6, the O / A ratio was 3, the extraction rate of V (Ⅳ) was 61.16%, the extraction rate of Fe (Ⅲ) was 18.87% 6.67.