氟硅酸制备高质量纳米白炭黑及F-溶液研究  

Synthesis of high-quality nano-silicon dioxide by fluosilicic acid and research on F-solution

作　　者：武莉莉[1] 李至秦[1] 李保山[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《无机盐工业》2014年第11期51-54,共4页Inorganic Chemicals Industry

摘　　要：以氟硅酸为硅源、氨水为氨解剂，制备合成了高质量的纳米白炭黑及高浓度氟离子溶液。考察了反应温度、加料方式、陈化时间及洗涤条件等因素对合成白炭黑性能的影响。确定了最佳工艺条件：在40℃下，分8次向氟硅酸中快速倾入氨解所需的氨水，直至体系的pH为8-9，陈化1h，抽滤、水洗后再用少量乙醇润洗，抽滤、放置挥发后再在110℃下干燥2h。所得白炭黑的粒度为89nm和322nm，二氧化硅质量分数大于93％，比表面积大于200m^2／g。所得溶液中氟离子的质量浓度可达90g／L以上，有利于综合利用。Fluosilicic acid as silica source and ammonium hydroxide as ammonia solution agent were used to synthesize high- quality nano-silicon dioxide and high content F- solution.The influence factor,such as the reaction temperature,feeding methods, aging time, and washing condition, on the preparation of silica dioxide was investigated.The optimum conditions for the synthesis of high-quality silicon dioxide were confirmed as follow： adding ammonia by 8 times to the product until the pH was at 8-9 at 40 ~C ;the product was aged for 1 h, rinsed with a little alcohol after washed with water, and dried at 110 ~C for 2 h after extraction, stewing, and volatilization.The nano-silicon dioxide with its mass fraction more than 93%, particle sizes of 89 nm and 322 nm,and the specific surface area is greater than 200 m^2/g was obtained.The mass concentration of F-in solution was more than 90 g/L, and it＇s benefit for comprehensive utilization.

关 键 词：氟硅酸 氨水 纳米白炭黑 

分 类 号：TQ124.3[化学工程—无机化工]