黄铵铁矾法分离钕铁硼二次废料酸浸液中铁和稀土
收稿日期: 2020-01-18
网络出版日期: 2020-06-12
基金资助
合肥工业大学科研项目(W2017JSKF0182)
Study on separating iron and rare earth by ammonium jarosite method from acid leach liquor of NdFeB secondary waste
Received date: 2020-01-18
Online published: 2020-06-12
研究采用黄铵铁矾法从钕铁硼二次废料硫酸酸浸液中分离铁和稀土。实验考察了反应时间、反应温度、pH、碱滴加速率对铁回收率和稀土损失率的影响。结果表明：反应时间越长、温度越高、pH越高,铁回收率越高,而碱滴加速率对稀土损失率影响较大。在反应时间为16 h、反应温度为80 ℃、反应pH为2.0~2.5、碱滴加速率为7.2 mL/min条件下,铁回收率可达到96.67%,而稀土损失率为18.74%,相对较少,说明通过黄铵铁矾法可以使铁和稀土得到有效分离。通过X射线衍射（XRD）和扫描电镜（SEM）表征,证明回收的铁沉淀物为斜六方体形貌的黄铵铁矾。
吴冕 , 邹兰梅 , 于少明 . 黄铵铁矾法分离钕铁硼二次废料酸浸液中铁和稀土[J]. 无机盐工业, 2020 , 52(6) : 68 -71 . DOI: 10.11962/1006-4990.2019-0428
The separation of iron and rare earth from sulfuric acid leach liquor of NdFeB secondary waste by ammonium jarosite method was studied.The effects of reaction time,reaction temperature,pH and dripping speed of alkali on recovery rate of Fe and loss rate of rare earth were investigated. Result showed that the longer the reaction time,the higher the temper-ature and the higher the pH are,the higher the recovery rate of Fe is.And the dripping speed of alkali had a greater impact on the loss rate of rare earth.The recovery rate of Fe reached 96.67% and the loss rate of rare earth was 18.74% which was rela-tively small at the reaction time of 16 h,the reaction temperature of 80 ℃,the pH of 2.0~2.5 and the dripping speed of alkali of 7.2 mL/min.It showed that Fe and rare earth can be separated effectively by ammonium jarosite method.By means of XRD and SEM,it is proved that the recovered iron precipitate is ammonium jarosite with inclined hexagonal shape.
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