摘要:
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pH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pH2.0,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。
关键词:
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钒渣 /
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无焙烧 /
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酸浸液 /
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萃取 /
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反萃
Abstract:
Extracting-stripping process was used to separate vanadium from other elements in the acid leaching solution of vanadium slag without roasting.The effects of extraction temperature,extraction time,pH value,composition of extraction agent,extraction phase ratio,stripping time,acid concentration and stripping phase ratio on the extraction rate and stripping rate of vanadium were investigated by single factor experiments.The results indicate that the extraction rate of V and Fe is respectively 74.49% and 1.92% without any other impurity ion in organic phase,under the temperature of 20℃,leaching solution pH=2.0,organic phase composition of 20% P204+5% TBP+75% sulfonated kerosene,phase ratio (O/A)=1:1 and shaking time of 5 min;the total extraction rate of V is 97.89% after 4-stage cross-flow extractions under the conditions mentioned above.The stripping experiment results indicate that,under the stripping time of 4 min,acid concentration of 200 g/L and phase ratio (O/A) of 5:1,the stripping rate of vanadium is 98.58% without iron ions in the water phase.
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