... separate Rare-earth metal in metallurgy industry. 2. Used to produce Tetracycline, Oxytetracycline, Phenobarbital, and Borneol, etc. in ... pharmaceutical industry.3. Used to polish marble, remove rust, process leather, bleach material etc. ... powder, Butadiene catalyst, etc. in organic chemical.6. Used to produce chemical material of porcelain capacitor, cleaner of ...