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系统研究了转炉钒渣无焙烧酸浸液中钒与铁的萃取分离情况。进行萃取-反萃单因素试验,分别考察萃取温度、初始p H值,萃取剂组成、萃取相比,萃取、反萃时间,反萃剂浓度、反萃相比等因素对萃取和反萃结果的影响。萃取试验结果表明:在常温(20℃),浸出液p H2.0,有机相组成20%P204+5%TBP+75%磺化煤油,相比(O/A)1∶1,震荡时间5 min条件下,钒的一级萃取率达到74.49%,铁的萃取率仅为1.92%,其他离子不进入有机相;该条件下进行四级错流萃取,钒的总萃取率可达97.89%。反萃试验结果表明:反萃时间4 min,反萃剂浓度200g/L,反萃相比(O/A)5∶1时,钒的反萃率达98.58%,有机相中的铁不进入反萃水相,提钒酸浸液得到净化。
The extraction and separation of vanadium and iron in converter roasted vanadium slag without roasting acid were systematically studied. The results of extraction and back extraction were compared with the single factor experiments of extraction and stripping. The extraction temperature, initial pH, extractant composition, extraction ratio, extraction time, stripping time, stripping agent concentration, Impact. The results of extraction experiments showed that when the temperature was 20 ℃, the leaching solution p H2.0, the organic phase consisted of 20% P204 + 5% TBP + 75% sulfonated kerosene, the O / A ratio was 1: 1 and the shaking time was 5 min Under the conditions, the first-grade vanadium extraction rate reached 74.49%, the iron extraction rate was only 1.92%, and other ions did not enter the organic phase; under the conditions of four-stage cross-flow extraction, the total vanadium extraction rate of up to 97.89%. The stripping experiments showed that the stripping time of vanadium reached 98.58% when the stripping time was 4 min, the concentration of stripping agent was 200 g / L and the ratio of stripping (O / A) was 5:1. The iron in the organic phase did not enter Reversed aqueous phase, mention vanadium acid extract to be purified.