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以Y(NO3)3.6H2O和碳酸氢铵为原料,在撞击流反应器中制备碳酸钇,经焙烧得到超细氧化钇粉体。考察了分散剂加入量、反应物摩尔比n(NH4HCO3)/n(Y(NO3)3)、活性碳用量、反应温度、反应时间、搅拌速度以及碳酸钇的焙烧温度和焙烧时间等因素对Y2O3粒径的影响,并用WJL激光粒度仪、TG、XRD和SEM等表征手段对产品进行表征,从而获得制备超细氧化钇的优化工艺条件为:PEG4000的质量为硝酸钇的3%,活性炭用量为0.025 mol·L-1,反应物摩尔比n(NH4HCO3)∶n(Y(NO3)3)为8∶1,反应温度50℃,反应40 min,螺旋桨转速1000 r·min-1,800℃下焙烧1.5 h,在此条件下制得球形氧化钇超细粉体,表观粒径小于0.5μm。
Y (NO3) 3.6H2O and ammonium bicarbonate were used as raw materials to prepare yttrium carbonate in an impinging flow reactor, and then calcined to obtain ultrafine yttrium oxide powder. The effects of the amount of dispersant, the molar ratio of n (NH4HCO3) / n (Y (NO3) 3), the amount of activated carbon, the reaction temperature, the reaction time, the stirring speed, the calcination temperature of yttrium carbonate and the calcination time were investigated. The optimum technological conditions for the preparation of ultrafine yttrium oxide were as follows: the mass of PEG4000 was 3% of yttrium nitrate, the amount of activated carbon was The reaction temperature was 50 ℃, reaction time was 40 min, propeller speed was 1000 r · min-1, and calcined at 1, 800 ℃ for 1.5h under 0.025 mol·L-1 molar ratio of n (NH4HCO3): n h, prepared under this condition spherical yttria ultrafine powder, the apparent particle size of less than 0.5μm.