... microsilica, silicon ash, condensed or densified silica fume, its color is grey. Silica fume is also called microsilica, silicon ash, condensed ... furnace with quality quartz, coke and scrap iron. Silica fume used in refractory can improve the liquidity and density, enhance ... the strength of high temperature and shock performance. Silica fume high-strength concrete is easily to pour, long-term keep ...