佘雪峰;王静松;丰富;王广;薛庆国;

• 1:北京科技大学冶金与生态工程学院钢铁冶金新技术国家重点实验室

摘要(Abstract)：

采用高温直接还原熔分工艺处理白云鄂博稀土复合铁矿,在1400℃条件下还原12和15 min,可得到含Fe 94.35%~95.20%的珠铁和含稀土9.71%~10.55%的富稀土渣。直接还原熔分过程未添加CaCO_3获得的稀土渣其稀土相以Ce_(4.667)(SiO_4)_3O析出,当配加5%的CaCO_3时,稀土富集相转变为铈磷灰石(Ca_3Ce_2[(Si,P)O_4]_3F),但两种稀土富集相均属于硅酸盐系。将获得富稀土渣磨碎至<74μm并置于HCl中浸出,实验结果表明:在HCl浓度1 mol·L~(-1),浸出时间2 h,固液比为1∶14和环境温度50℃时,稀土浸出率均能达到95%以上,还原熔分过程未添加CaCO_3设定还原时间12和15 min或还原熔分过程加入5%CaCO_3还原时间12 min,富稀土渣中Th的浸出率从21.92%分别增加到31.43%和51.58%。

关键词(KeyWords)： 直接还原;稀土矿;浸出;物相转变

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年科学基金项目(51304015);; 钢铁冶金新技术国家重点实验室自主研发基金(41614007)资助

作者(Author): 佘雪峰;王静松;丰富;王广;薛庆国;

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DOI:

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