Abstract
A novel industrial technology for producing rare earth oxides of high purity (>99.99%) by temperature pressurized ion-exchange displacement chromatography is reported. It was concluded from the technological parameters that the concentration of complex agent in the eluent can be several times higher than that used in the classical ion-exchange method if a certain amount of buffer is present; the height equivalent to a theoretical plate (HETP) decreases linearly with increase in the operating temperature, increases slightly with increase in the flow-rate of the eluent and depends on the particle size of the ion exchanger. Rare earth oxides of high purity were manufactured on an industrial scale using a solution of special composition as eluent, and enriched rare earth mixtures or single rare earth oxides with low grade as raw and processed material on a temperature pressurized ion-exchange multi-column operating system containing polytetrafluoroethylene as the inner liner.
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