(中国科学院 过程工程研究所， 北京 100080)
摘 要: 对Nb2O5在KOH亚熔盐体系中的溶解行为进行了研究， 通过正交实验和因素实验分析了KOH浓度、 反应温度、 反应时间、 搅拌速率和碱矿比等因素对Nb2O5在KOH亚熔盐体系中溶解行为的影响。 结果表明：反应温度和KOH浓度是最重要的影响因素；在一定温度下，KOH浓度越高越有利于得到可溶性的六铌酸钾；而在一定KOH浓度下， 温度越高越容易得到不溶性的铌酸盐沉淀。不溶性沉淀经ICP-AES和XRD分析证明为偏铌酸钾（KNbO3）。
关键字: Nb2O5； KOH； 溶解行为； 亚熔盐
（ Institute of Processing Engineering,
Chinese Academy of Sciences, Beijing 100080, China）
Abstract: The dissolution behavior of Nb2O5 in KOH sub-molten salt was investigated. The effect of factors, such as KOH concentration, reaction temperature, reaction time, agitation speed and the mass ratio of alkali-to-ore, on the dissolution behavior of Nb2O5 in KOH sub-molten salt was investigated through orthogonal experiments and factorial experiments. The results show that, the more important factors among them are reaction temperature and KOH concentration, the high KOH concentration is beneficial to the formation of soluble niobate, but the high temperature leads to forming insoluble niobate. The insoluble niobate precipitates formed during Nb2O5 dissolving in KOH sub-molten salt were analyzed by ICP-AES and XRD, which was proved to be KNbO3.
Key words: Nb2O5; KOH; dissolution behavior; sub-molten salt
