摘要
以pH值原位测定法为基础 ,结合沉淀体积变化、沉淀粒度及外观形貌分析结果 ,对NaHCO3沉淀镧的性能及碳酸镧的结晶过程进行了研究。结果表明 :碳酸镧结晶活性区域位于低配比区0 541～ 2 82 8之间 ,而在高配比区其结晶是惰性的。同时还考察了搅拌对结晶过程的影响 ,讨论了NaHCO3沉淀镧时的沉淀反应和结晶化机理。并给出了相关的化学反应方程式。
Based on pH situ determination data,together with the results of variation in precipitation volume and precipitation partical size,the properties of lanthanum carbonate precipitated with sodium bicarbonate were investigated.The results show that crystalliazation active zone of lanthanum carbonate is in low molar ratio zone,where the moalr ratio is between 0.541～2.828.However,the crystallization of lanthanum carbonate in high molar ratio zone is inactive.At the same tine,the influence of stirring on the crystallization of lanthanum carbonate was examined ,the crystallization mechanism was discussed and the corresponding reaction equations were proposed.
出处
《稀有金属与硬质合金》
CAS
CSCD
2001年第2期4-8,共5页
Rare Metals and Cemented Carbides
基金
国家自然科学基金资助项目!(5 976 40 0 1)
江西省自然科学基金资助项目!(972 0 0 7)
关键词
pH值原位测定法
结晶
碳酸镧
碳酸氢钠
沉淀剂
镧
sodium bicarbonate
pH situ determination
crystallization process
lanthanum carbonate
