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Separation of molybdenum and tungsten from iron in hydrochloric-phosphoric acid solutions using solvent extraction with TBP and P507

化学 磷酸 盐酸 萃取(化学) 剥离(纤维) 杂质 核化学 无机化学 色谱法 有机化学 电气工程 工程类
作者
Luqi Zeng,Tianzu Yang,Xintao Yi,Ping Chen,Jiaxun Liu,Guangsheng Huo
出处
期刊:Hydrometallurgy [Elsevier BV]
卷期号:198: 105500-105500 被引量:24
标识
DOI:10.1016/j.hydromet.2020.105500
摘要

A mixture of TBP and P507 was proposed for the separation of molybdenum (Mo) and tungsten (W) from iron (Fe) in a hydrochloric-phosphoric acid (HCl-H3PO4) solution that was obtained from the hydrochloric acid preleaching of low-grade scheelite. Various extractants with TBP were investigated, and P507 showed synergistic effects on Mo and W extraction and a strong antagonistic effect on Fe extraction. Then, the effects of various conditions on the separation of Mo and W from Fe with the mixture of TBP and P507 were investigated. Using 24% (v/v) TBP, 16% (v/v) P507 and 60% (v/v) kerosene as extractants, 90% Mo and 88% W were extracted with only 8% Fe co-extraction, and the separation factors of Mo/Fe and W/Fe were 153 and 118, respectively, through one-stage extraction under the following conditions: 1.7 mol/L H+, A/O ratio of 3:1, contact time of 10 min, and temperature of 15 °C. After two-stage batch continuous extraction, 99% Mo, 94% W and 10% Fe were extracted. By washing with 2 mol/L hydrochloric acid, most of the Fe and other impurities were removed with negligible losses of Mo and W. Upon stripping with 5 mol/L ammonia at a 1:1 organic-to-aqueous phase ratio, almost 100% of the Mo and W were recovered from the washed organic phase. Other impurities, such as P, Si, Ca, Al, and Mn, minimally affected the extraction of Mo and W.
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