碱金属掺杂硫酸钙短晶的常压水热法合成与热稳定性分析

发布时间：2018-06-07 06:43

  本文选题：磷石膏 + 晶须　； 参考：《硅酸盐通报》2017年11期

【摘要】：以磷石膏为原料,采用常压水热法,在Ca~(2+)、Na~+、K~+氯化物电解质溶液体系中制备了硫酸钙晶须。研究了产物硫酸钙的晶体形貌、晶体结构、受热失水温度和晶体生长控制机理。结果表明:在10wt%~30wt%Ca~(2+)、Na~+、K~+的氯化物电解质溶液,水热结晶产物形貌均为长径比范围在3~7的短晶。其中,在Ca~(2+)、Na~+、K~+氯化物体系下,磷石膏分别转化为CaSO_4·0.5H_2O、Na_2Ca_5(SO_4)_6·3H_2O(水钠钙矾石)、K_2Ca(SO_4)_2·H_2O(多钙钾石膏)短晶,晶体受热失水温度分别约为161.2℃、259.4℃与489.8℃。探讨了所掺杂碱金属离子的对短晶结构与热稳定性的影响。为硫酸钙基晶须在塑料改性的应用研究和工业化生产奠定研究基础。
[Abstract]:Calcium sulfate whisker was prepared from phosphogypsum by hydrothermal method at atmospheric pressure in the electrolyte solution system of Ca~(2. The crystal morphology, crystal structure, heat loss temperature and crystal growth control mechanism of calcium sulfate were studied. The results show that the morphology of hydrothermal crystallization products in the chloride electrolyte solution of 10wt%~30wt is short crystal with the ratio of length to diameter in the range of 3 ~ (7). Among them, phosphogypsum is transformed into CaSO_4 0.5H _ 2O-Na _ 2CaD _ 2C _ 2C _ 2C _ 2C _ 2C _ 2C _ 2O _ 3 in the system of Ca~(2, and the temperature of hot water loss of the crystal is about 259.4 鈩，

本文编号：1990247