Quartz / Quartzite use in the Refractory Industry

Due to its high refractoriness, quartzite and quartz are utilized to make acid silica bricks. Fluxes, including lime, iron oxide, magnesia, and alkalis, reduce refractoriness. The raw material must be pure, with a high silica concentration and as little Al2O3 as possible.

The refractoriness of silica is decreased by the addition of 0.01% Al2O3. Because the silica grains cemented with cristobalite and tridymite are the stable phase of silica, silica rocks of metamorphic origin are superior to those of igneous origin. Quartzite should have fine grains, be compact, and be cryptocrystalline in nature. The following criteria for quartzite were established by the raw materials sub-committee of the directorate general of technical development on refractories in its report dated September 1985.

thermal characteristic of quartzite should be such that :

• The process of heat conversion is uniform.
• Define the gravity of quartzite lumps that have been burnt in ordinary kilns at 1430 C with an appropriate firing schedule to be 1 or less than 2.46.
• Fired quartzite lumps ought to be spotless, spotless, and clean.

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 up to .05%
• No contamination

Specification of Quartzite

• High content of SiO2 98.5% and above.
• Sizes: 30/50, 30/80
• Fe2O3 content: 0.04%
• Al2O3: nil or maximum up to .005%