3·XH2O為前驅(qū)體制備含鈧的碳酸鹽。研究了反應(yīng)溫度、沉淀劑量和攪拌速度對(duì)鈧回收率的影響。通過粉末X射線衍射和激光粒子測(cè)定表征了pH值對(duì)含鈧碳酸鹽晶體結(jié)構(gòu)和粒徑的影響。結(jié)果表明，隨著反應(yīng)pH值的增大，含鈧碳酸鹽的結(jié)構(gòu)由非晶結(jié)構(gòu)變?yōu)榻Y(jié)晶結(jié)構(gòu)，初始變化pH值約為6時(shí)，氧化鈧的晶體結(jié)構(gòu)為立方結(jié)構(gòu)。同時(shí)，在一定條件下，可以獲得3.756?103.8 μm尺寸的鈧沉積物顆粒。當(dāng)pH值為7時(shí)，鈧的D50為6.634 μm。含鈧碳酸鹽被用作制備氧化鈧的前體。TG-DTA結(jié)果表明，碳酸鹽的分解溫度趨于600 ℃左右。基于XRD和IR分析，可以得出，當(dāng)煅燒溫度為1000 ℃時(shí)，獲得相對(duì)純凈的氧化鈧粉體材料。同時(shí)，采用激光粒度分析儀、BET和SEM-EDS對(duì)所得氧化鈧粉末進(jìn)行表征。球形氧化鈧粉末的微晶尺寸小于10 μm，表面積約為373.952 m2/g。微觀結(jié)構(gòu)非常均勻，呈球形結(jié)構(gòu)。;The preparation of spherical scandium oxide powders by ammonium bicarbonate precipitation was investigated. The carbonate containing scandium was prepared in the solution with ScCl3·XH2O as precursor. The effect of reaction temperature, amount of precipitant and stirring speed on the recovery of scandium was discussed. The effect of pH on the crystalline structure and particle size of carbonate containing scandium was characterized by the powder X-ray diffraction and laser particle sizer. Results demonstrate that the structure of carbonate containing scandium changes from non-crystalline structure to crystalline structure with increasing the reaction pH value. It indicates that when the initial change pH value is about 6, the crystalline structure of scandium oxide is cubic structure. Meanwhile, scandium sediment particles with 3.756?103.8 μm in size can be obtained in a certain condition, depending on the pH value,. When the feasible pH value is 7, the D50 of scandium sediment can be 6.634 μm. The carbonate containing scandium is used as a precursor for the preparation of scandium oxide. The TG-DTA result indicates that the decomposition temperature of the carbonate tends to about 600 ℃. Based on the XRD and IR analysis, it can be concluded that the appropriate calcination temperature for obtained relatively pure scandium oxide is 1000 ℃. Meanwhile, the obtained scandium oxide powders were characterized by the laser particle size analyzer, BET and SEM-EDS. The crystallite size of spherical scandium oxide powders is less than 10 μm with a surface area of about 373.952 m2/g. The microstructure is very homogeneous with spherical structure."/>
2O3粉體;沉淀法;球形結(jié)構(gòu);Sc2O3 power;precipitation;spherical structure"/>