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Using the flame melting method to realize mass production of spheroidization of quartz powder

wallpapers Tech 2021-01-15
At present, various manufacturers mainly use flame melting methods to achieve 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 main production equipment includes: powder quantitative conveying system, gas quantity control and mixing device, gas fuel high temperature flame spray gun, cooling recovery device, etc.
 
Powder quantitative conveying system
The powder material to be processed into spherical quartz powder is continuously and uniformly transported into the high temperature flame according to the specified feeding amount;
 
Gas volume control and mixing device
According to flame temperature, flame length and rigidity, it can adjust and control the amount of gas and combustion-supporting gas, and fully mix the gas and combustion-supporting gas and send it to the high-temperature flame spray gun;
 
Gas fuel high temperature flame spray gun
It sprays mixed fuel gas (mixed with combustion-supporting gas) and non-spherical quartz powder materials at the same time. After ignition, a high-temperature flame is generated, and the dispersed quartz powder is melted to make it into spherical quartz powder.
 
Cooling recovery device
The fused and dispersed high-temperature spherical quartz powder is rapidly cooled to avoid crystallization, and the cooled spherical quartz powder is recovered in the collector.
 
The ball formation 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 becomes a molten state. The heat is further transferred to the inside of the powder, and the powder particles are completely In a molten state. Under the action of surface tension, the object always tends to a stable state, and the spherical shape is the most stable state, so as to achieve the goal of the product into a ball.
 
Whether the powder particles can be melted depends on two aspects:
 
First, the flame temperature is higher than the melting temperature of the powder material, which requires the selection of a suitable gas fuel;
The second is to ensure the heat required to melt the powder particles. When the flame temperature is constant, the amount of heat required for the powder particles of different particle sizes to melt is different, and the amount of heat absorbed is proportional to the time the powder particles are in the flame, so the powder particles can be obtained in the flame. The relationship between the time required to melt and its particle size.
 
t=βωd
 
Where t is the time required for the powder particles to melt in the flame; β is the correlation coefficient of the material, such as specific heat, thermal conductivity, density, etc.; ω is the correlation coefficient of the flame; d is the particle size of the powder particles.
 
According to the time required for the powder particles to melt in the flame and the speed of the powder particles in the flame, the required length of the flame is obtained, and the fuel gas volume control device is adjusted to meet the requirements.

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