Journal
METALS
Volume 7, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/met7050174
Keywords
extractability; alkaline sintering-water immersion-acid leaching; tuff; Chongqing
Funding
- National Key Basic Research and Development Program [2014CB238902]
- National Natural Science Foundation of China [41502162, 41602172]
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The tuff, a part of coal-bearing strata, in the Zhongliangshan coal mine, Chongqing, southwestern China, hosts a rare metal deposit enriched in rare earth elements (REE), Ga and Nb. However, the extraction techniques directly related to the recovery of rare metals in coal-bearing strata have been little-studied in the literature. The purpose of this paper is to investigate the extractability of REE, Ga and Nb in the tuff in the Zhongliangshan mine using the alkaline sintering-water immersion-acid leaching (ASWIAL) method. The results show that ASWIAL can separate and extract REE, Ga and Nb effectively under the optimized conditions of calcining at 860 degrees C for 0.5 h with a sample to sintering agent ratio of 1: 1.5, immersing at 90 degrees C for 2 h with 150 mL hot water dosage, and leaching using 4 mol/L HCl at 40 degrees C for 2 h with a liquid-solid ratio of 20: 1 (mL: g). The final leaching efficiencies of REE and Ga are up to 85.81% and 93.37%, respectively, whereas the leaching efficiency of Nb is less than 1%, suggesting the high concentration of Nb in the leaching residue, which needs further extraction.
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