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As the main raw material to burn into the zircon refractory products.
Performance Zr02 melting point 2677 ℃, acid and alkali erosion.Zirconia polycrystalline transformation phenomenon.At about 1100 ℃,
monoclinic zirconia crystal shape into square type crystal zirconia, with 7% of the volume change at the same time;Under 2300 ℃,
the quartet zirconia crystal shape into a stable type cubic zirconia.For preparing stabilized zirconia, usually to join CaO and MgO style or
Y2O3 as stabilizing agent, such as by heating with 1100 ~ 1200 ℃, to the preparation of stable type cubic zirconia solid solution.
The starting materials for the raw materials used in the manufacture of zirconia brick for baddeleyite and zircon.Baddeleyite is a kind of
exist in the form of oxide minerals containing zirconium, ZrO2 content 80% ~ 80%;Zircon exists in the form of the silicate minerals containing
zirconium, Zr02 theory content is 67.2%.In baddeleyite preparation of zirconia and zircon as raw materials with chemical method and fused method.
Chemical method containing zirconium chemically from the ore into the method of ZrO2.Will join the hot caustic soda zircon ore concentrate,
the reaction products zirconium sodium with concentrated hydrochloric acid washing, oxygen zirconium chloride can be obtained from (ZrOCl2, 8 h2o).
Dissolve oxygen zirconium chloride in water, adding ammonium hydroxide zirconium hydroxide precipitation generated.Zirconium hydroxide by calcination, zirconium oxide can be obtained from.The chemical reaction is as follows:
