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What is spherical Quartz Powder?
After being purified from quartz stone, sphere quartz powder is pulverized and ultrafinely pulverized. The powder then goes through a certain temperature field so that its phase form, crystal form, shape, and state change instantaneously, from solid state into molten state, then to solid state again, then to solid state. Finally, it becomes crystalline. Amorphous powder is made from irregularly angular particles and transformed into regular spherical pieces.
The main preparation method for spherical powder quartz is
1. Flame melting is used primarily to mass produce spheroidized quartz dust. The heating device must have a stable temperature, adjustable temperature ranges, and there is no secondary pollution to quartz powder. This technology is key. The ball-forming principle is that the high-temperature fire spray gun produces a high temperature flame between 1600 and 2000. When the powder enters a high-temperature flame area, its angular surfaces absorb heat. The heat is then transferred to the powder’s interior, where it is completely molten. The action of surface tension means that objects tend to be in a stable condition. Spherical is the best state for forming a ball.
2. The local thermodynamic equilibrium (or thermal plasma) is another name for this plasma. The main feature of thermal plasma is the fact that the plasma’s electron temperature, ion temperature and gas temperature are all almost identical. The thermal plasmas are arc plasma, high frequency and induction plasma.
High-frequency plasmafusion is used for the preparation of spherical quartz. This method has a moderate range, stable control, high output and can achieve a high rate of spheroidization, making it more suitable for production. The principle and procedure are similar to that of flame melting. This mainly transforms the high temperature heat source into an plasma generator.
Compressed air is used as the working gas. The volume of the working gases is 10m3/h. The high-frequency generator generates heat by generating high-temperature gas at 4000-7000. The silica is carried from the top of the plasma reactor furnace to the arc region by the feeder. After melting and gasifying, the powder is then transported through the feeder. After being quenched by a special quencher, the silica powder can then be collected by gravity, cycle (micron scale) or bag dust (nanoscale). In a matter of 1s-2s you can get spherical and nanoscale SiO2 particles.
3. Chemical synthesis
To obtain silica sol, heat the silica emulsion with ammonia or ammonium bicarbonate. The gel is then treated with acid to produce hydrated spherical silica. This product has a low uranium level, which is a characteristic. However, it is also easy to agglomerate.
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