Quartz / Quartzite use in refractory Industry

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  Quartz/Quartzite Powder and Granules

  Quartzite / Quartz is use in the manufacture of acid silica bricks as it was high refractoriness. Refractoriness lowered by the presence of fluxes such as lime, iron oxide, magnesia and alkalies. The purity of raw material i.e., the high silica content is essential with least possible Al2O3.

  . The presence of 0.01% Al2O3 lowers the refractoriness of silica. Silica rock of metamorphic origin is better than that of igneous origin because the silica grains cemented with cristobalite and tridymite are stable phase of silica. Physically, quartzite should be of fine grained, compact and cryptocrystalline type. The raw materials sub-committee of the directorate general of technical development on refractories in its report dated September 1985 has stipulated the following specifications for quartzite.

  The thermal characteristic of quartzite should be such that (i) there is uniformity during thermal conversion; (ii) specify gravity of fired quartzite lumps in conventional kilns at 1430 C with proper firing schedule should be 1 less than 2.46, and (iii) fired quartzite lumps should be clean, white and spot free.

  Our Quartz (Silica) Specifications

  high content of SiO2 99.8% and above.

  Sizes: 0.1mm to 8.0 mm

  Fe2O3 content: 0.002-0.008%

  Al2O3: nil or maximum upto .05%

  No contimination

   

  Specification of Quartzite:

  high content of SiO2 98.5% and above.

  Sizes: 0.1mm to 8.0 mm

  Fe2O3 content: 0.04%

  Al2O3: nil or maximum upto .005%

   

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