首页|Sequential alkaline-organic acid leaching process to enhance the recovery of rare earth elements from Indonesian coal fly ash

Sequential alkaline-organic acid leaching process to enhance the recovery of rare earth elements from Indonesian coal fly ash

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In this decade,coal fly ash(CFA)is considered a potential secondary source of rare earth elements(REEs).However,most REEs in coal fly ash are encapsulated in aluminosilicate glass,making it challenging to recover them through acid leaching.In this study,a sequential alkaline-organic acid leaching was developed for the recovery of REEs from CFA.The effect of alkaline leaching using NaOH solution on the destructive ability of aluminosilicate glass,as well as the mineralogy and morphology changes of the resulting coal fly ash,was first studied.Furthermore,the effectiveness of alkaline leaching on the re-covery ability of REEs through organic acid leaching was evaluated.The results show that the maximum leaching efficiency for Si and Al,which was obtained at the optimum alkaline leaching conditions,namely NaOH concentration of 10 mol/L,reaction temperature of 65 ℃,liquid/solid(L/S)ratio of 10 mL/g,and reaction time of 90 min,is 28％and 32％,respectively.The digestion reaction with NaOH lixiviants also causes coal fly ash to become more porous,making it advantageous in the organic acid-leaching process at the REEs recovery stage.The utilization of the desilicated residue produced from the diges-tion process in acid leaching effectively increases the overall REEs recovery from 32.2％to 77.6％.

Rare earth elementsAlkalineOrganic acidCoal fly ash

Widya Rosita、Indra Perdana、I Made Bendiyasa、Ferian Anggara、Himawan Tri Bayu Murti Petrus、Agus Prasetya、Isyatun Rodliyah

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Department of Nuclear Engineering and Engineering Physics,Faculty of Engineering,Universitas Gadjah Mada,Jl Crafika No.2,Yogyakarta,55281,Indonesia

Department of Chemical Engineering,Faculty of Engineering,Universitas Gadjah Mada,Jl Grafika No.2,Yogyakarta,55281,Indonesia

Department of Geological Engineering,Faculty of Engineering,Universitas Gadjah Mada,Jl Grafika No.2,Yogyakarta,55281,Indonesia

Unconventional Geo-resources Research Group,Faculty of Engineering,Universitas Gadjah Mada,Jl Grafika No.2,Yogyakarta,55281,Indonesia

Center for Testing of Mineral and Coal Tekmira-Directorate General of Mineral and Coal-Ministry of Energy and Mineral Resources,Jl.Jend.Sudirman No.623,Wr.Muncang,Kec.Bandung Kulon,Kota Bandung,Jawa Barat,40211,Indonesia

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Ministry of Research,Technology and Higher Education,Republic of IndonesiaUniversitas Gadjah Mada

0386/E4/BP/20211501407/UN1.FTK/SK/HK/2022

2024

10.1016/j.jre.2023.09.001

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(7)