环烷酸萃取脱除废旧稀土荧光粉酸浸液中铁铝

研究了废旧稀土荧光粉酸浸液在环烷酸萃取过程中关于铁、铝杂质的除杂效果，考察环烷酸对于铁、铝、稀土的选择性；有机相组成、氨水浓度、温度对分离效果的影响；水洗温度、水洗相比对水洗效果的影响；盐酸浓度、相比、反萃时间对反萃效果的影响.结果表明:选择环烷酸:异辛醇:磺化煤油体积比为20:20:60、氨水浓度为2 mol/L、温度为20 ℃、氨水滴加速度为3 mL/min时，分离效果较优；水洗温度为40 ℃、相比（A/O）为2时，铁铝稀土的洗脱率分别为1.5%、4.2%和26.4%；反萃剂盐酸浓度为3 mol/L、反萃相比（A/O）为1、反萃时间为20 min时，铁、铝、稀土萃取率分别高达99.5%、99.8%和99.8%. 

Naphthenic acid separation of waste phosphors in acid leaching solution of iron and aluminum

In this paper, the effect of removing impurities of iron and aluminum in the process of naphthenic acid extraction of waste rare earth phosphors was studied. The selectivity of naphthenic acid for iron, aluminum and rare earth was investigated. The effect of organic phase composition, ammonia concentration and temperature on the separation effect; Influence of washing temperature and washing ratio on washing effect; Effect of hydrochloric acid concentration, comparison and back extraction time on back extraction effect. The results showed that the best separation effect was achieved when the volume ratio of naphthenic acid: isooctanol: sulfonated kerosene was 20:20:60, the concentration of ammonia was 2 mol/L, the temperature was 20 ℃, and the droplet acceleration of ammonia was 3 mL/min. When the washing temperature was 40 ℃ and the comparison (A/O) was 2, the elution rates of Fe, Al and Re were 1.5%、4.2% and 26.4%, respectively. When hydrochloric acid concentration was 3 mol/L, reverse extraction ratio (A/O) was 1 and reverse extraction time was 20 min, the extraction rates of iron, aluminum and rare earth were up to 99.5%、99.8% and 99.8% respectively.