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Novel Harmless Utilization of Bayan Obo Tailings: Separation and Recovery of Iron and Rare Earth
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2020-07-08 , DOI: 10.1021/acs.iecr.0c01438
Yan Zhou 1, 2 , Xiangxin Xue 1, 2 , He Yang 1, 2 , Shizhe Song 1, 2 , Xiaowei Huang 3
Affiliation  

In this work, the carbothermal reduction and hydrochloric acid leaching were utilized for separation and recovery of iron and rare earth from the Bayan Obo tailings. The effects of temperature, addition of calcium oxide, and reaction time on the metallization rate of iron during roasting were investigated. The results showed that the metallization rate of iron reached 99.67% and the loss rate of fluorine was less than 1% under optimum roasting conditions of a temperature of 1100 °C, a coal ratio of 6.77 wt %, a calcium oxide ratio of 10 wt %, and a roasting time of 2 h. The behavior of iron and rare earth in magnetic separation was found to be controlled by the particle size after grinding. Using ball milling, 98.2% of rare earth and 96.7% of Fe were separated. A hydrochloric acid solution with a low concentration of 3 mol/L was used to leach rare earth from the magnetic separation tailings. The results showed that the leaching recovery of rare earth exceeded 99%, and more than 80% of other valuable elements were also leached out. Finally, the leaching residue contained 52.38 wt % of pure calcium fluoride, which can be used as a raw material for the flotation of fluorite.

中文翻译:

巴彦鄂博尾矿的新型无害利用:铁和稀土的分离与回收

在这项工作中,利用碳热还原法和盐酸浸出法从巴颜鄂博尾矿中分离和回收铁和稀土。研究了焙烧过程中温度,氧化钙添加量和反应时间对铁的金属化速率的影响。结果表明,在最佳焙烧条件下,温度为1100℃,煤比为6.77 wt%,氧化钙比为10 wt%,铁的金属化率达到99.67%,氟的损失率小于1%。 %,并且烘烤时间为2 h。发现铁和稀土在磁选中的行为受研磨后的粒径控制。使用球磨,分离出98.2%的稀土和96.7%的Fe。使用低浓度的3 mol / L盐酸溶液从磁选尾矿中浸出稀土。结果表明,稀土的浸出回收率超过99%,其他有价值元素的浸出率也超过80%。最后,浸出残渣含有52.38重量%的纯氟化钙,其可用作浮选萤石的原料。
更新日期:2020-07-29
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