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Production of rare earth oxides from raw ore in fluidized bed reactor
Adrián Carrillo García,Mohammad Latifi,Said Samih,Jamal Chaouki 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.85 No.-
This study deals with the calcination of a rare earth bearing ore to produce rare earth oxides in afluidizedbed reactor, with the aim of demonstrating the advantage of calcining bigger particles to decomposestable minerals such as monazite by its mineral association within a particle. Rare earth oxides wereproduced by the decomposition of its bearing minerals, bastnäsite and monazite along with the gangues. During the calcination, bastnäsite decomposed at relatively low temperature while monazite reacted CaOat high temperature. The formation of cracks, revealed by BET and SEM analysis, allowed the particle’sdegassing while the size remained constant, thus describing a crackling core behavior. The association of monazite to calcite for bigger particles ( 60 mesh) allowed its decomposition toproduce rare earth oxides with a monazite conversion of 50 %. Also, an extraction process comprised ofcalcination and mild acid leaching enriched the rare earth oxides in the ore by 3.34 and improvedleaching efficiency of the gangues compared to smaller size (enrichment ration of 2.35). Using biggerparticle sizes in the upstream process of a mining industry, i.e. comminution, can also reduce the energyconsumption.