Quartz (SiO2) is an important rock-forming mineral. It can be found in magmatic, metamorphous and sedimentary stone and deposits. Most naturally occurring silicon dioxide is in the form of trigonal quartz.
Large deposits of recoverable quartz are of decisive importance for industrial applications. But in most cases, the chemical purity and consistency are generally not sufficient to enable the use of raw quartz directly. Quarzwerke processes and refines the raw material, subjecting it to complex washing, classification, drying and iron-free grinding steps to produce silica sand, quartz flour and fine powders.
The manufacture of quartz flour and fine powders with specified particle sizes requires separation processes in addition to iron-free milling. Using a combination of grinding and optical technologies, Quarzwerke is capable of producing quartz powders with particle sizes of 1μm. An additional refining process is targeted surface modification, e.g. with silanes or other silan-based substances, geared toward the respective subsequent application.
Features
• High hardness of 7 (Mohs)
• High chemical resistance
• Density 2.65 g/cm3
• Angular particles
• Low thermal expansion coefficient : 14*10 -6 K -1(at temperatures between 20-300°C)
• Good thermal conductivity: 9 W/m*K
• Good electrical insulation characteristics (low tan delta)
Key applications
• Outdoor electrical insulation material/ material for high voltage insulation
• Cast resins
• Calcium silicate hydrate
• Exterior plasters
• Paints
• Anticorrosive coatings
• Silicone
See also Quartz - it all depends on the right raw materials