Zircon is extremely resistant to high temperatures, with a melting point of 2750 㠃, and is resistant to acid corrosion.80% of the world's zircon is directly used in casting, ceramics, glass industry and the manufacture of refractory materials. A small amount of zircon is used in ferroalloys, medicine, paint, Tanning, abrasives, chemical and nuclear industries. A very small amount of zircon is used to smelt metal zirconium. ZrO 266% -66% zirconium quartz sand is directly used as foundry iron metal due to its melting resistance (melting point above 2500 橮 Mold material. The main purpose of this passage is to tell us. ['Zircon is extremely resistant to high temperatures.', 'Industrial applications of zircon.', 'Zircon is resistant to acid corrosion.', 'Special properties of zircon.']