Process and Kinetic Study on Preparation of Nanometer Y₂O₃by Roasting of Basic Yttrium Carbonate AITranslate

4谢济运,黎桂昌,叶有明,马皓皓.焦炭还原焙烧锰矿制备硫酸锰及其机理[J].有色金属（冶炼部分）,2024(3):26-31.

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Chinese Library Classification Number:TF845.2[冶金工程—有色金属冶金]

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In addressing the issue of easy-agglomeration during the roasting process to prepare nanometer Y₂O₃powder by liquid precipitation method,the influence of roasting conditions on the morphology and particle size of Y₂O₃and kinetic behavior of nanometer basic yttrium carbonate,obtained with the mixed precipitation agents of sodium carbonate and sodium bicarbonate,were systematically studied.The results show that under the conditions of a roasting temperature of 860℃,a heating rate of 5.375℃/min,and a roasting time of 1 h,nanometer Y₂O₃with good dispersion of D₅₀=0.050μm and(D₉₀―D₁₀)/(2D₅₀)=0.98 is obtained,and its morphology is similar to that of precursor basic yttrium carbonate.The thermal decomposition of roasting basic yttrium carbonate precursor(Y(OH)CO₃·H₂O)to prepare nanometer Y₂O₃powder includes two stages.In the first stage,Y(OH)CO₃·H₂O decomposes to generate Y(OH)CO₃,with an apparent activation energy E of 90.23 kJ/mol,a pre-exponential factor A of 7.46××10⁵,and a reaction order n of 0.75.In the second stage,Y(OH)CO₃decomposes to generate Y₂O₃,with an apparent activation energy E of 236.55 kJ/mol,a pre-exponential factor A of 1.31×10¹¹,and a reaction order n of 0.82.