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| Study on Sulfuric Acid Roasting-Leaching of High-iron Rare Earth Concentrate |
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Received:November 04, 2020
Revised:November 11, 2020
Accepted:November 16, 2020
Published Online:March 24, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2021.04.006 |
| KeyWord:RE concentrate; sulfuric acid; low-temperature roasting; high-temperature roasting |
| Author | Institution |
| LI Chao |
中国地质科学院矿产综合利用研究所 |
| LIU Shu-ping |
中国地质科学院矿产综合利用研究所 |
| XU Ling-fei |
中国地质科学院矿产综合利用研究所 |
| HUANG Wen-xiao |
国土资源部放射性与稀有稀散矿产重点实验室 |
| LIANG Guan-jie |
国土资源部放射性与稀有稀散矿产重点实验室 |
| HE Lan-jun |
国土资源部放射性与稀有稀散矿产重点实验室 |
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| 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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