Ceramic factories have precious metals such as alumina, zirconium oxide, magnesium oxide, calcium oxide, beryllium oxide, zinc oxide, yttrium oxide, titanium oxide, thorium oxide, uranium oxide, etc. For production, people add precious metals such as alumina, zirconium oxide, magnesium oxide, calcium oxide, beryllium oxide, zinc oxide, yttrium oxide, titanium oxide, thorium oxide, and uranium oxide into ceramics.