ENRICHMENT OF RARE EARTH OXIDE WITH SMELTING REDUCTION PROCESS

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Disclosed is a method for concentrating rare earth oxides through smelting reduction. The method for concentrating rare earth oxides through smelting reduction includes the steps of : preparing rare earth ores; treating the rare earth ores through the smelting reduction; separating smelting reduction-treated pig iron; and separating slag where rare earth elements are concentrated through the separation of the pig iron. Desirably, the rare earth ores contain a large quantity of iron (Fe). Further, the smelting reduction is conducted according to an equation of reaction : iron oxide + carbon → iron (Fe) + CO and an equation of reaction : iron oxide + CO → iron (Fe) + CO² . The smelting reduction is desirably conducted in a reducing atmosphere. Furthermore, upon the smelting reduction, cokes or flux may be further added as a carbonaceous reducer. Desirably, the cokes are added by 1.5 times with respect to a theoretical value needed for iron reduction in the ores, and the flux is added to a quantity of 30% or less with respect to the ores.(AA) Obtain rare earth(ST100) Rare earth ore preparation(ST120) Smelting reduction (add coke( reducer) and flux)(ST140) Pig iron (Fe) separation(ST160) Concentrated slag separation(ST180) Leaching (acid, alkali)COPYRIGHT KIPO 2014