ZrSiO

Chemical leaching (1,12) with acids is used to extract metal contamination. High purity zirconia, Zr02, is produced by the caustic fusion of zircon [14475-73-1], ZrSiO, foUowed by the chemical removal of sUica. Chemical leaching is generaUy foUowed by washing. 

As mentioned, zircon (ZrSiO ) has many forms, but the most used is the transparent crystal that is cut to resemble a diamond. There is even one form of zirconium used in medicine zirconium carbonate (dZrO COj HjO), which, as a lotion, can be used to treat poison ivy infections. 

Zirconium silicate (ZrSiO ) is one form of the mineral whose crystals when polished are known as cubic zircons, which resemble diamond gemstones. 

ZrSiO and low-intensity lines of monoclinic (0.316, 0.284, 0.219, 0.180 nm) and tetragonal (0.295 nm) zirconium dioxide and a-cristobalite (0.405, 0.169 nm). The X-ray pattern of mechanically activated mixture 3 contains lines of zircon and only two low-intensity lines of a-cristobalite. The X-ray pattern of a mechanically activated and thermally treated mixture 2 is practically identical to that of mixture 3, and X-ray pattern of mixture 4 contains weak reflections of monoclinic and tetragonal zirconium dioxide. 

Yoon et al. tried to improve Mn/Ce based catalyst. They used various support such as SiOj, TiOj, ZrSiO, ZrOj, and ZrO -TiOj and found that TiO, is the best support. They also investigated the effect of the additives on Mn/Ce composite oxide supported on TiO,. As Table 14. 2 shows, the best result is obtained with the catalyst modified with a small amount of Co i.e. Mn (2.7 wt%)-Ce(6.8 wt%)-Co(0.5wt%) on TiO, [36]. 

CAS 14940-68-2. ZrSiO or Zr02 Si02. A natural zirconium silicate, represents 60-70% of all zirconium used. 

Zirconium(IV) oxide reacts with phosgene at 400 C to give zirconium(lV) chloride [360], and zircon (ZrSiO ) reacts with phosgene between 1000 and 1250 C to give ZiCl [120]. Phosgene has been postulated as an intermediate in the chlorination of zircon [1943], anatase or rutile [1767]. 

---