Three types of amorphous SiO 2 (sediment product, experimental product and Ludox product) are prepared from quick speed reaction between wollastonite and hydrochloric acid. The specific area of sediment product, experimental product and Ludox product is 200, 400, 450m 2/g respectively.
硅灰石与盐酸快速反应制备出沉淀产物、实验产物和溶胶产物3种无定形SiO2,3种产物的比表面积分别在200400和450m2/g左右。