富钾正长岩水热碱法沸石化及成矿意义

Zeolitization of Potassic Syenites by Alkali-hydrothermal Treatment and Its mineralization Significance

本文以富钾正长岩粉体为原料,首次通过直接水热碱法处理,成功合成了方沸石和羟钙霞石,合成温度260℃,时间4 h。通过控制正长岩粉体、氢氧化钠和水的配比,可分别将正长岩粉体中的微斜长石、斜长石和石英转化为方沸石或羟钙霞石,同时正长岩中的K2O和过剩的Si O2被溶出进入液相,可用于制取钾盐。不同类型富钾正长岩直接水热碱法沸石化的成功,为解释自然界中的沸石成因、长石与沸石的共生及转化关系、与沸石化有关的金属矿化机制以及油气成因等,提供了实验证据,也为直接利用廉价的长石类硅铝质矿物原料合成沸石提供了新的技术途径,对于利用非水溶性钾资源制取钾盐具有指导意义。

Analcime and hydroxycancrinite were synthesized successfully by alkali-hydrothermal treatment of potassic syenite at 260 ℃ and 4 h. The two minerals analcime and hydroxycancrinite were formed by controlling the ratio of the syenite powder, Na OH and distilled water. The K2 O and partial Si O2 of the syenite were dissolved into the solution during the synthesis. Zeolite formation of the three kinds of syenite by direct alkali-hydrothermal method is of importance to the potash salt preparation using insoluble potash resources while it is useful to interpret the mineralization mechanism of some metal ores, oil and gas formation, intergrowth and transformation of feldspars and zeolites, and natural zeolitization as well.