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有色金属(冶炼部分):2021,(4):36-40
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高铁稀土精矿硫酸焙烧—浸出试验
李超1, 刘述平1, 徐凌飞1, 黄雯孝2, 梁冠杰2, 何兰军2
(1.中国地质科学院矿产综合利用研究所;2.国土资源部放射性与稀有稀散矿产重点实验室)
Study on Sulfuric Acid Roasting-Leaching of High-iron Rare Earth Concentrate
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投稿时间:2020-11-04    修订日期:2020-11-11
中文摘要: 某地稀土矿经选矿获得的稀土精矿,其稀土含量较低、铁含量高,分别进行了浓硫酸低温焙烧及浓硫酸高温焙烧试验。结果表明,以浓硫酸低温焙烧工艺处理该高铁稀土精矿,在较佳条件下,稀土浸出率达96.94%,钍浸出率达97.36%,铁浸出率亦达92.71%;以浓硫酸高温焙烧工艺处理该高铁稀土精矿,在较佳条件下,稀土浸出率可达90.15%,钍浸出率为42.10%,铁浸出率仅12.44%。浓硫酸低温焙烧工艺获得的稀土浸出液铁含量高、酸度大(Fe含量23 g/L左右,pH<0.5),从高铁、高酸稀土溶液中回收稀土产品,其工艺过程较繁琐。浓硫酸高温焙烧工艺处理该高铁稀土精矿,可获得铁含量较低(Fe含量约2.3 g/L)的稀土浸出液,从低铁含量的稀土溶液中回收稀土产品,其工艺流程较简短,废水较易治理,在生产成本上也具有优势。
中文关键词: 稀土精矿  浓硫酸  低温焙烧  高温焙烧
Abstract:Low-temperature sulfuric acid roasting and high-temperature sulfuric acid roasting were carried out to deal with high-iron content RE concentrate. The results show that under the optimized low-temperature sulfuric acid roasting-leaching process conditions, leaching rate of rare earth, thorium and iron is 96.94%, 97.36% and 92.71%, respectively. Under the optimized high-temperature sulfuric acid roasting-leaching process conditions, leaching rate of rare earth, thorium and iron is 90.15%, 42.10%, and 12.44%, respectively. Low-temperature sulfuric acid roasting–leaching process obtains high iron leachate (Fe ~23 g/L, pH<0.5) with which it is difficult to recover RE. However, iron content in high-temperature sulfuric acid roasting leachate is low (Fe ~2.3 g/L). RE recovery process from low iron leachate is relatively short and wastewater is easier to treat.
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基金项目:中国地质大调查项目(DD20190574);国土资源部放射性与稀有稀散矿产重点实验室开放基金(RRSM-KF2018-06)
引用文本:
李超,刘述平,徐凌飞,黄雯孝,梁冠杰,何兰军.高铁稀土精矿硫酸焙烧—浸出试验[J].有色金属(冶炼部分),2021(4):36-40.
LI Chao,LIU Shu-ping,XU Ling-fei,HUANG Wen-xiao,LIANG Guan-jie,HE Lan-jun.Study on Sulfuric Acid Roasting-Leaching of High-iron Rare Earth Concentrate[J].Nonferrous Metals (Extractive Metallurgy),2021(4):36-40.

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