Quartz powder, also known as silica powder, is a hard, wear-resistant, chemically stable silicate mineral, the main component of which is SiO2. The color of quartz sand is milky white or colorless and translucent, as shown in Figure 1. Its chemical, thermal and mechanical properties have obvious anisotropy, and its melting point is 1650°C. The quartz ore stone mined from the mine is processed by various processes to obtain quartz powder.
Quartz powder has the characteristics of high whiteness, high strength, no impurities, good insulation performance, chemical stability, and good fluidity, so it has a wide range of applications. The latest application progress is briefly introduced below.
1. Prestressed High-Strength Concrete, PHC
Taking advantage of the characteristics of high strength, good fluidity, and high-quality seasoning under the same conditions, quartz powder has been widely used in various pile foundation engineering fields, among which the most common is C80 high-strength concrete pipe piles. The main raw materials are quartz powder, mineral powder, Different proportions of fly ash lead to different mechanical properties of pipe piles.
2. Cable sheath
This sheath material has excellent flame retardant properties, low toxicity and low corrosion properties and good electrical properties. It also has good softness, strong impact resistance, high cross-linking density, high tensile strength, good physical and mechanical properties, and Stable, long service life and other advantages.
3. Pressure sensing medium
Quartz powder is used as the pressure sensing medium for the thick-walled three-way hot-pressing axial compensation molding method. The quartz powder is used as the filler, and the size is 100-140 mesh. This invention is easy to operate, less in the process, high in efficiency, uniform in product quality and low in cost. .
4. Fused ceramics
The method of using quartz powder to prepare fused ceramics uses the thermally decomposed product of sucrose as a carbon source. In a nitrogen atmosphere, through carbothermal nitriding reduction reaction, a sintering aid is formed on the surface of the fused silica powder in situ to obtain a functional Fused silica powder, when the quartz powder is used in the preparation and molding of fused ceramics, the distribution in the matrix is more uniform, and the crystallization phenomenon is inhibited to a certain extent. The method is simple and stable in operation, low in energy consumption, economical and environmentally friendly, and the raw materials used are cheap and easy to obtain, and is suitable for industrial production.
5. AMOLED substrate glass
The process of making AMOLED substrate glass with quartz powder, the specific steps are: (1) ball milling the raw ore; (2) pickling after magnetic separation treatment, and then drying; (3) water quenching after calcination; (4) three-stage magnetic After selection, classify again, collect quartz sand powder with a particle size of 160~220 mesh as a semi-finished product, and dehydrate it with a centrifuge; (5) After drying, use a permanent magnetic separator for magnetic separation to obtain quartz powder for AMOLED substrate glass .
6. Active conductive powder concrete
A conductive active powder concrete, the main components are cement, fly ash, silica fume, quartz sand, chopped ultra-fine stainless steel microwires, water, water reducing agent, etc. The resistivity of active powder concrete is greatly reduced, and it has self-sensing performance. The production process is simple, the production cost is low, and it can also solve the problem that the steel fibers of thin plate components are easy to be exposed. It is especially suitable for special applications such as snow melting and ice melting, electromagnetic shielding or absorption. structural field.
7. Corrosion-resistant insulation board plastering anti-crack mortar
Using raw materials such as quartz sand, Portland cement, fly ash, silica fume, lime calcium, water reducer, and admixture, a kind of anti-crack mortar for plastering the corrosion-resistant insulation board was prepared. The corrosion-resistant thermal insulation board has good plastering and thermal insulation effect, high corrosion resistance and strong adhesive force, simple preparation process, convenience and quickness, high efficiency, high resource recycling rate, energy saving and emission reduction, low production cost and high economic benefit.