Spherical quartz powder is purified and ultrafinely pulverized from natural quartz stone, and then passes through a certain high temperature field, so that its phase state, crystal form and shape change instantly, from solid state to molten state and then to solid state, from crystalline state to crystalline state. Amorphous, a powder obtained from irregular angular particles into regular spherical particles.
1. At present, the method of flame melting is mainly used to realize the mass production of spheroidized quartz powder. The key to this technology is that the heating device requires a stable temperature field, easy adjustment of the temperature range, and no secondary pollution to the quartz powder. The ball-forming principle is: the high-temperature flame spray gun sprays a high-temperature flame of 1600-2000 ℃. When the powder enters the high-temperature flame zone, its angular surface absorbs heat and is in a molten state, and the heat is further transferred to the inside of the powder, and the powder particles are completely in molten state. Under the action of surface tension, objects always tend to be in a stable state, and spherical is the most stable state, so as to achieve the purpose of forming a ball.
2. Thermal plasma is also called local thermodynamic equilibrium plasma. Its main feature is that the local electron temperature (Te), ion temperature (Ti) and gas temperature (Tg) in the plasma are almost the same. Arc plasma, high frequency plasma and induction plasma are all thermal plasmas.
The high-frequency plasma fusion method is used to prepare spherical quartz powder, which has a moderate temperature range, stable control, high output, and can achieve a high spheroidization rate, so it is a more suitable production method. The principle and process are similar to the flame melting method, which mainly changes the high temperature heat source into a plasma generator.
The working gas is compressed air, and the working gas volume is 10m3/h. The input power of the high-frequency plasma generator is 100kW, and the high-temperature gas of 4000℃-7000℃ is generated as a heat source. The silica powder is transported from the top to the arc area of the plasma reaction furnace through the feeder, and the powder is melted and gasified by heat. , quenched by a special quencher, and then collected by gravity, cyclone (micron scale) and bag dust (nano scale), within 1s-2s, spherical micron and nanoscale SiO2 powder can be obtained.
3. Chemical synthesis
At a certain temperature, the silica sol emulsion is treated with ammonia water or ammonium bicarbonate to obtain spherical gel, and then the gel is treated with acid to obtain hydrated spherical silica. The characteristic is that the uranium content is low, and the disadvantage is that the product is easy to agglomerate.
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