CAJ | 학술논문

以草酸为沉淀剂,采用正向沉淀的方式,合成中心粒径D50在20~39 μm之间的Gd2O3.采用马尔文激光粒度分析、扫描电镜等技术手段分析稀土料液起始浓度、草酸浓度、沉淀温度、陈化时间、灼烧温度及草酸滴加速率对最终产物粒径大小的影响.结果表明:控制氯化钆起始浓度0.9 mol/L、滴加速率1 mL/min、沉淀温度60~70℃、草酸浓度1 mol/L、陈化时间10 h、灼烧温度900℃即可制备中心粒径D50达到38.93 μm的大颗粒Gd2O3.此外,控制合成条件为草酸浓度0.8 mol/L、草酸滴加速率3 mL/min、氯化钆起始浓度0.75 mol/L、沉淀温度80℃、振荡陈化时间10 h、灼烧温度900℃,可制备中心粒径D50为18.57μm、比表面积为6.001 m2/g的砂状形貌Gd2O3.
이초산위침정제,채용정향침정적방식,합성중심립경D50재20~39 μm지간적Gd2O3.채용마이문격광립도분석、소묘전경등기술수단분석희토료액기시농도、초산농도、침정온도、진화시간、작소온도급초산적가속솔대최종산물립경대소적영향.결과표명:공제록화구기시농도0.9 mol/L、적가속솔1 mL/min、침정온도60~70℃、초산농도1 mol/L、진화시간10 h、작소온도900℃즉가제비중심립경D50체도38.93 μm적대과립Gd2O3.차외,공제합성조건위초산농도0.8 mol/L、초산적가속솔3 mL/min、록화구기시농도0.75 mol/L、침정온도80℃、진탕진화시간10 h、작소온도900℃,가제비중심립경D50위18.57μm、비표면적위6.001 m2/g적사상형모Gd2O3.
Using Oxalic acid as a precipitating agent, Gd2O3,whose central particle size D50 is 20-39 μm ,was prepared by using positive precipitation technology. The effects of rare earth feed solution initial concentration, oxalic acid concentration and precipitation temperature, aging time, burning temperature and dropping on the final product particle size were analyzed through Malvern laser particle size analyzer and SEM. The results show that:gadolinium chloride starting concentration of 0.9 mol/L, dropping rate of 1 mL/min, precipitation temperature of 60-70℃, oxalic acid concentration of 1 mol/L, aging time of 10 h, ignition temperature of 900 ℃, large particle Gd2O3 with center particle size D50 of 38.93μm can be prepared. In addition, oxalic acid concentration is 0.8 mol/L, oxalic acid addition rate 3 mL/min, gadolinium chloride concentration 0.75 mol/L, the precipitation temperature 80℃, shaking aging time 10 h, burning temperature 900℃,sand-like morphology Gd2O3 with center particle size D50 of 18.57μm can be prepared, and its specific surface area is 6.001 m2/g.