| In recent years,there have been more and more scientific research projects to extract aluminum,gallium,lithium and rare earth from fly ash in China.The characteristics of trace element enrichment and easy extraction in fly ash are getting more and more attention,its available value is gradually developed,and its comprehensive utilization level has also made good progress in the world.The research group found that a large amount of aluminum,lithium,gallium and rare earth elements are enriched in coal and fly ash in Zhungeer mining area,and the extraction of aluminum,lithium,gallium and rare earth elements from fly ash has broad prospects.This study will carry out the research on the extraction process of aluminum,lithium,gallium and rare earth in fly ash,and will be applied in the actual industry,which will expand the extraction ways of various elements and extend the industrial chain of comprehensive extraction of fly ash,thus improving the comprehensive utilization rate of fly ash to a higher degree.X-ray fluorescence spectrometer(XRF)was used to detect that the content of alumina in the fly ash reached 44.0 % and the molar ratio of aluminum to silicon was 1.12.X-ray powder diffractometer(XRD)was used to detect that the main minerals in the fly ash are barium-iron-brittle mica,zircon,white phosphorus iron ore,magnesium nitrate and molybdenite.The leaching process of aluminum,lithium,gallium and rare earth elements in fly ash was optimized by using single factor and orthogonal test,and the best leaching scheme of aluminum,lithium,gallium and rare earth elements in fly ash was proposed based on the principle of improving the leaching rate of aluminum,lithium,gallium and rare earth elements,low cost and no pollution.Leaching conditions: 3 mol / L hydrochloric acid,leaching temperature 130 ?,solid-liquid ratio 1: 10,leaching time 3h.Under the verification test conditions,the leaching rates of aluminum,lithium,gallium and rare earth elements were 88 %,79.4 %,94.6 % and 97 %. |
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