氟硅酸氨化制高补强性白炭黑干燥方式研究

Study on Drying Processes of High Reinforcing Silica from Amination of Fluosilicic Acid

以磷肥副产氟硅酸为原料,氨水为氨解剂制备了高补强性白炭黑。为获得团聚少,质量好的白炭黑产品,研究了烘箱干燥、真空干燥、喷雾干燥、溶剂置换干燥对白炭黑比表面积和粒度的影响。实验结果表明,通过溶剂置换干燥能有效防止白炭黑形成硬团聚,所得白炭黑粒度小,比表面积大。同时分析了4种干燥方式中白炭黑粉体硬团聚形成的机理。

High reinforcing white carbon black is prepared from phosphate fertilizer by-product fluosilicic acid. Influence of drying methods, including oven drying, vacuum drying, spray drying and solvent exchange drying on the specific surface area and size of silica white are studied in order to obtain a silica white of low agglomeration and good quality. Experimental results indicate that solvent exchange drying can prevent silica white from forming hard agglomerate, the silica white obtained through solvent exchange drying is small in size and large in specific surface area. Meanwhile hard agglomeration mechanism of silica white among the four drying processes is also discussed.