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| Study on Extraction of Rare Earth and Niobium from Potash Feldspar Tailings |
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Received:January 19, 2020
Revised:February 12, 2020
Accepted:February 14, 2020
Published Online:May 26, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.06.008 |
| KeyWord:niobium; rare earth; sulfuric acid roasting; leaching; tailings |
| Author | Institution |
| WANG Wei |
中国地质科学院郑州矿产综合利用研究所 |
| LIU Lin |
中国地质科学院郑州矿产综合利用研究所 |
| CAO Yao-hua |
中国地质科学院郑州矿产综合利用研究所 |
| LIU Hong-zhao |
中国地质科学院郑州矿产综合利用研究所 |
| ZHANG Bo |
中国地质科学院郑州矿产综合利用研究所 |
| WANG Hong-liang |
中国地质科学院郑州矿产综合利用研究所 |
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| Abstract: |
| Rare earth minerals in potash feldspar tailings are mainly composed of allanite, monazite, bastnaesite and parasite, while niobium minerals in tailings are mainly composed of niobite and rutile, and rare earth and niobium minerals have fine grain size and are closely associated with other minerals. Content of REO and Nb2O5 is 0.52% and 0.19% respectively. Rare earth and niobium were extracted by sulfuric acid roasting-water immersion. Effects of acid addition, roasting time and temperature, leaching temperature and time on leaching rate of rare earth and niobium were studied. The results show that leaching rate of rare earth and niobium is 83.3% and 75.9% respectively under the optimum conditions including mass ratio of sulfuric acid to tailings of 2︰1, roasting at 300 ℃ for 2 h, and leaching at 80 ℃ for 2 h with L/S=3. |
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