Iron bearing oxide minerals separation from rare earth elements (REE) rich coal fly ash

2nd Mineral Processing and Technology International Conference

工业技术（总论）;矿业工程

Nugroho, N.D.^1 ; Rosita, W.^1 ; Perdana, I.^1 ; Bendiyasa, I.M.^1 ; Mufakhir, F.R.^2 ; Astuti, W.^2

Advanced Material and Sustainable Mineral Processing Research Group, Chemical Engineering Department, Universitas Gadjah Mada, JlGrafika no 2, Yogyakarta, Indonesia^1

Research Unit for Mineral Technology, Indonesian Institute of Science (LIPI), Jl. Ir. Sutami km 15, Tanjung Bintang, Lampung Selatan, Indonesia^2

关键词: Alternative source;    Coal resources;    Iron components;    Iron concentrations;    Magnetic field strengths;    Optimal process;    Optimal values;    Separation techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/478/1/012026/pdf
DOI  :  10.1088/1757-899X/478/1/012026

学科分类：工业工程学

来源: IOP

【 摘 要 】

Recovery of Rare Earth Elements (REE) from waste is an important alternative to solve global REE crisis. Therefore, coal fly ash containing REE becomes a potential candidate as an alternative source of REE. Indonesia has a large potential of coal resources, however unlike other type of coals which is rich in SiO2 and Al2O3, Indonesian coal contains significant amount of Fe2O3. As a consequence, fly ash resulted from burning Indonesia coal is also rich in iron oxides. The presence of high concentration of iron oxides will however reduce effectiveness of REE recovery from coal ash through hydrometallurgy process. Therefore, iron oxides in the coal fly ash needs, firstly, to separate preceding further REE separation. This study determined the optimal process conditions in the iron recovery process from coal fly ash. The variables studied were fly ash grain size, magnetic field strength and separation techniques. The iron recovery was determined by mean of the ratio of iron concentration after and before magnetic separation. Experimental results showed that increasing magnetic field strength and decreasing coal fly ash grain size in a wet separation will increase the recovery of magnetic iron component. Magnetic field strength of 4300 Gauss and grain size of -400 mesh were the optimal values in this study with iron recovery of 25.89%.