烘烤
硫酸
浸出(土壤学)
高岭石
化学
煅烧
煤
残留物(化学)
溶解
无机化学
核化学
矿物学
催化作用
有机化学
地质学
物理化学
土壤科学
土壤水分
作者
Yu Xie,Chenquan Ni,Zhengwei Han,Hong Zhong,Zhiguo He,Wei Sun
标识
DOI:10.1016/j.mineng.2023.108284
摘要
As the price and demand for lithium metal continue to rise, super-enriched lithium coal is expected to become a new resource to obtain lithium, but there are little research studies on methods for extraction process and mechanism. In this study, a lithium-rich coal residue was leached with H2SO4 after roasting activation without any additive. The properties and morphology of raw ore, calcined samples and leaching residue were characterized by proximate analyses, XRF, ICP-OES, XRD and SEM-ESD. The major chemical compositions were Al2O3 (26.46 %), SiO2 (41.35 %), C (9.43 %) and the valuable lithium content was 550 mg/kg. The main phase compositions of the raw coal residue are kaolinite, quartz, anatase, gypsum and muscovite. The highest leaching efficiency of lithium was achieved under conditions of calcination at 500 °C, leaching reaction time of 40 min, in 15 % wt/v sulfuric acid concentration at a leaching temperature at 90 °C. The occurrence at lithium was closely associated with the kaolinite. The mechanism of roasting activation is that kaolinite loses its structural hydroxyl group and transforms into metakaolinite, and the exposed lithium can undergo ion exchange and minerals dissolution reaction with sulfuric acid.
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