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Zircon (ZrSiO4) is a kind of natural minerals are exist in natural world stably. It has the excellent chemical stability and phase stability, low thermal expansion coefficient and good thermal shock resistance, erosion resistance of molten steel and alkaline molten slag which is silicate minerals. Zircon can be divided into high and low varieties according to their physical properties and chemical composition, the crystal with perfect crystalline is high type and the crystal with poor or without crystalline is low type. Because of the radioactive element, the internal structure of zircon is destroyed, according to the characteristics of the internal structure, it can be divided into high type zircon, medium type zircon and low type zircon. It has been attracted widespread attention that the zircon can be used in fireproof materials and ceramic materials.  http://www.slazs.com

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