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| New Process of Low Temperature Curing and Water Leaching for Lithium Extraction and Purification of High Purity Quartz from a Lithium Ore |
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Received:May 21, 2024
Revised:June 27, 2024
Accepted:June 28, 2024
Published Online:August 08, 2024
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| DOI：doi：10.3969/j.issn.1007-7545.2024.09.021 |
| KeyWord:hydrothermal altered lithium ore; low temperature curing and water leaching; high purity quartz; comprehensive utilization |
| Author | Institution |
| DU Shuhua |
安徽省地质实验研究所（国土资源部合肥矿产资源监督监测中心） |
| LI Fan |
安徽省地质实验研究所（国土资源部合肥矿产资源监督监测中心） |
| XIA Liang |
安徽省地质实验研究所（国土资源部合肥矿产资源监督监测中心） |
| WANG Jinyun |
安徽省地质实验研究所（国土资源部合肥矿产资源监督监测中心） |
| TAO Nai |
安徽省勘查技术院 |
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| Abstract: |
| The Li2O content of a low-grade hydrothermal altered lithium ore in Southern Anhui Province is 0.21%, which belongs to a new type of lithium ore resource. The main mineral components are feldspar, quartz, muscovite and chlorite. Lithium is mainly present in lithium chlorite in the form of lattice. The new process crushes the ore to -1 mm, and the +0.425 mm particle size enters the grinding to prepare a qualified particle size of -0.425+0.074 mm. Mica concentrate is obtained by magnetic separation of qualified grade products after desliming, feldspar concentrate and quartz concentrate are obtained by flotation of non-magnetic materials. Feldspar concentrate and mica concentrate were used to extract lithium, and quartz concentrate was purified by acid treatment to obtain high purity quartz. The -0.074 mm fine mud produced by screening of raw ore, regrinding, and by qualified grade stirring and scrubbing, respectively, were combined into total mud for subsequent lithium extraction. The results show that the leaching rate of Li2O is 88.78% by low temperature curing and water leaching process to extract lithium from slime, mica concentrate and feldspar concentrate respectively. After acid leaching, the content of SiO2 and Fe in quartz concentrate is 99.942% and 4.38 mg/kg respectively, which meet the requirements of low-end products of high-purity quartz. The yield of feldspar and mica leaching residue after lithium extraction is 54.48%, which can be used for building materials. XRD and SEM analysis of samples before and after leaching show that low temperature curing of sulfuric acid destroy the lattice structure of lithium chlorite, replacing Li+ in lithium chlorite with H+ to release lithium. The new process reduces grinding costs, has a high lithium leaching rate, takes into account the recovery of mica, quartz, and feldspar, reduces tailings discharge, and improves the comprehensive utilization level of low-grade hydrothermal altered lithium ore. |
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