... and slag, etc.(2) Hard materials: carborundum, brown corundum, superfine cement, zirconium sand, and fire-proof materials, etc.(3) High purity ... materials: quartz, feldspar, α-alumina, glass fine bead, etc.(4) Metal powders: zinc powder, aluminum powder, iron ... . Note: Cleaned gas will be discharged by induced draft fans. Ultra-fine Grinding Ball Mill(CE Certification)