摘要
用快速淬火高压釜测定了ｋ２ＳｎＦ６、Ｋ２ＮｂＯＦ５、Ｋ２ＴａＦ７在２００－５５０℃、１００ＭＰａ条件下的水解特征，并将上述溶液在５００℃水解后，置于２００－３００℃、１００ＭＰａ下进行不同时间返溶。实验测定表明，不同元素配合物水解强弱及返溶的难易程度均有不同。温度愈低、酸度愈小及时间愈短愈不可逆。不可逆的原因是水解后产物陈化，形成难溶氧化物。作者认为配合物水解曲线可用来衡量水解不可逆的程度。
Hydrolytic characteristics of K_2SnF_6, K_2TaF_7, and K_2NbOF_5, at 200-550℃ and 100MPa were investigated using a rapid quenching vessel. After the complex was hydrolyzed at 500℃ and 100MPa, the solubilities of the hydrolytic products were determined at 200-300℃ and 100MPa. The results show that the lower the temperature is, the lower the acidity is and the shorter the reaction duration is, the slower it is to reach the chemical equilibrium, i.e., the more irreversible the hydrolysis is. This is attributed to the formation of insoluble oxides, which is resulted from the ageing of hydrolytic products. It is concluded that the curves of the complex hydrolysis can be used to measure the degree of irreversible hydrolysis and that the experimental study of the complex hydrolysis and their redissolution is an effective way to learn the geochemical behaviour of elements.
出处
《地球化学》
CAS
CSCD
北大核心
1995年第C00期183-190,共8页
Geochimica
基金
国家自然科学基金
