摘要
进行了麦饭石中元素的溶出试验,结合麦饭石的矿物组成和岩石结构,探讨了麦饭石中矿物元素溶出的微结构模型,采用该微结构模型分析了颗粒尺寸、温度、时间及溶出次数对矿物元素溶出过程的影响。研究结果表明:麦饭石颗粒变小,溶出液的矿化度呈指数形式增加;麦饭石溶出次数增加,矿化度明显降低;溶出温度增加,矿化度和Sr含量增加,且增幅较大;溶出时间增加,矿化度和Sr含量增加,但增幅较小;麦饭石的矿物组成及岩石结构特征有利于矿物元素的溶出。麦饭石矿物元素溶出微结构模型可以表示为麦饭石浸入水中→界面水膜层形成→水渗入→水合作用→元素离子化→离子迁移、扩散→元素溶出,该模型进一步说明麦饭石粒度变小和溶出温度增加等都能促进矿物元素的溶出。
In the paper the dissolution of mineral elements in Maifan stone was studied; combined with rock structure, microscopic structure of Maifan stone, the microstructure model of dissolution of mineral elements in Maifan stone was established; the effects of particle size, temperature, time and frequency on the dissolution of mineral elements were analyzed with the microstructure model. The results showed that the mineralization concentration increased geometrically with decreasing particle size, and decreased obviously with increasing time of dissolution; the mineralization concentration and Sr content increased with increasing temperature and time; the mineral composition and structure of Maifan stone were favorable to the dissolution of mineral elements; the microstructure model could be expressed as: Maifan stone immerging into de-ioned water →forming interface water film → water permeating → hydration → ion transferring and diffusing → mineral element dissolution, it was confirmed that decreasing particle size of Maifan stone and increasing temperature were beneficial to enhance the dissolution of mineral elements.
出处
《矿物学报》
CAS
CSCD
北大核心
2004年第4期425-428,共4页
Acta Mineralogica Sinica
基金
科技部"重大基础研究前期研究专项"资助项目(No.2003CCA01300)
