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SiO2≥90—99% Fe2O3≤0.06—0.02%,Refractory 1750 --- 1800 ° C, large particles in appearance, yellow skin capsules on the surface. Granularity range 1-320 mesh, can be produced according to user requirements. Main uses: metallurgy, ink silicon carbide, building materials, enamel, cast steel, filter material, soda ash, chemical industry, spraying and other industries.