Study On Microbe Adsorption Of Rare Earths From The Leach Liquid Of The Weathered Crust Elution-deposited Rare Earth Ore

In this paper, the methods of extraction rare earths from the leach liquor of the weathered crust elution-deposited rare earth ore are reviewed, such as precipitation with oxalic acid, and precipitation with ammonium bicarbonate and precipitation-floatation, and with non-precipitation technology such as solvent extraction, ion exchange, liquid membrane and microbe adsorption were introduced respectively. The advantages, potential problems and new challenges existed in this extraction process were discussed briefly. The developing trend of solvent extraction and microbe adsorption industrial practice has expected. The green chemistry development orientations are suggested.The weathering crust Elution-deposited rare earth ore grade has the depleted trends, as well as lean ore leaching rare earth concentration is more and more low and leaching selectivity increasingly poor practical problems. South rare earth ore (LN) was selected the representative. Inherent laws of adsorbing rare earth ions from rare earth ore leaching solution using Aspergillus oryzae sp. A-FuO3and Saccharomyces cerevisiae S-Ful were studied.. With the optimization of adsorption conditions of experiment, high efficiency adsorption of rare earth ions, and excellent desorption agent were achieved. In order to free cell kinetic model as the basis, the Langmuri equation and the Frendlich equation mathematical model were used to fit theexperimental data, and the hrare earth ions biosorption mechanism was systematic studied. The adsorption kinetics control steps of establishing mathematical model were found out to strengthen the adsorption measures. The study can achieve the valuable rare earth resource of green pollution-free production and the high efficient and sustainable utilizationenrich and develop the weathering crust Elution-deposited rare earth ore extraction metallurgy.