以氟硅酸钠为主要原料,采用分步法工艺制备白炭黑与氟化钠.在优化的工艺条件下,制备的白炭黑DBP值3.52 mL/g,一次粒径20 nm,二氧化硅含量98.97%,具有疏松的非晶形二次团聚结构;制备的氟化钠具有立方晶结构,平均粒径110 μm,氟化钠含量98.63%.工艺实现硅源和氟源全方位利用,氨循环利用,提高了氟化钠产品的质量和得率,大大减少含氟废水量.
Using sodium fluoride as the main raw material, silica and sodium fluoride were prepared by fractional step method.Under the optimized process conditions, silica has amorphous structure with loose secondary aggregates, silica DBP value of 3.52 mL/g, primary particle diameter of 20 nm, a silica content of 98.97%.Sodium fluoride having a cubic crystal structure, the average particle diameter of 110 μm, sodium fluoride content of 98.63%.The process can make full use of fluorine source and silicon source, ammonia recycling, improving the quality and yield of sodium fluoride, greatly reducing the amount of fluorine-containing waste water.
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