Yttrium Hydroxide was Prepared by Electrolysis of Y(OH)3 Cation Membrane and Heat Treated to Generate Y2O3
The preparation of rare earth oxides by electrochemical method has great advantages in environmental protection and economy,and the cation exchange membrane electrolytic rare earth chloride conversion technolo-gy has not been applied to the preparation process of Y2O3,and the parameters and optimization methods of the Y(OH)3 conversion process are still unclear.In this study,Y(OH)3 aqueous solution was used as raw material,and flake yttrium hydroxide deposits were obtained at the cathode by cation exchange membrane electrolysis technology.The thermal decomposition process of yttrium hydroxide was studied by DSC-TG,FTIR and XRD,and yttria products inherited from the precursor structure were obtained.SEM and XRD were used to test the ef-fects of different pole pitches,cathode yttrium ion concentration,current density,and temperature on the crys-tals and morphology of the electrolyte.The best experimental conditions are as follows:5 cm pole distance,0.025 mol·L-1 cathode yttrium ion concentration,31.3 mA·cm-2 current density and 55 ℃ electrolysis temperature,the product has the best morphology and particle structure.
ion exchange membrane electrolysisY(OH)3Y2O3electrolysis of aqueous solutionsrare earths
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