Third, increase the top auxiliary nozzle.
Since the current ceramic factory uses a pressure spray drying tower, the hot air is from the top into the tower, and the slurry is sprayed upward, resulting in a relatively high thermal space in the upper part of the tower without the entry of mist. In order to make full use of the heat source and increase the powder output, an auxiliary nozzle can be added at the top of the tower.
Fourth, improve the wind separation structure and increase the evaporation intensity.
A wind deflector is provided at the air inlet to gradually reduce the hot air entering the tower from the central axis of the tower. In this way, the wind can be divided into several strands to rotate into the tower, or the wind can be divided into several parallel downward movements. This improvement can improve the utilization of heat, and can also make the moisture content of the powder uniform, thereby improving the quality of the powder.
Fifth, control the intake and exhaust air temperature.
Increasing the inlet and outlet temperatures can effectively increase the output of the powder. However, as the inlet air temperature increases, the bulk density of the powder decreases. Generally, the inlet air temperature is adjusted to 400-500 ° C; the exhaust air temperature should be ensured to ensure the consistency of the water content of the powder, and the feed pressure and the number of spray guns also directly affect the moisture content of the powder.
6. Suitable ceramic additives.
As an auxiliary material for ceramic production, the additive can make up for the defects that the raw material itself cannot overcome. For blanks with little or no clay content, it is difficult to form due to poor plasticity. It is necessary to add a wetting agent and a plasticizer to form a liquid interlayer between the billet particles, thereby increasing the plasticity and reducing the internal friction between the particles. The pressure distribution is uniform and the pressure loss is reduced when the blank is pressed, and the particle structure and performance of the powder are ensured. Commonly used additives are: triethylene glycol acetate, glycerin, cellulose derivatives, high-polymerization polysaccharides, etc., the addition amount of which is between 0.2% and 1%, and has a good effect.
Seven, the adjustment of particle size.
The particle size is adjusted by adjusting the spray pressure and nozzle aperture. Generally, the pressure increases, the spray height increases, and the mist droplets become smaller; on the contrary, the spray height decreases, and the mist droplets become larger. The nozzle aperture is reduced and the particles become smaller; the nozzle holes are enlarged and the particles become larger. In production, the amount of large particles is usually required to be as high as about 50%, and the fine powder is reduced as much as possible to ensure that the exhaust is easy when the blank is pressed, to reduce the cracking defects, and to reduce the compression ratio and improve the fluidity.
8. Ensure that the fuel is fully burned and adjust the ratio of fuel or gas to air volume.
Avoid fuel ash falling into the powder, causing quality problems such as foaming and coloring of the product. At the same time, the furnace temperature in the hot blast stove is strictly controlled. Generally, it is required to generate at least 1000 ° C high temperature, and the fluctuation range should be as small as possible.
9. Reasonable aging period.
The stale is used to ensure that the moisture content of the powder is uniform. At the same time, a large number of anaerobic bacteria are propagated in the billet, and in the low-temperature and high-humidity environment, they are continuously dying and become humic acid, so that the plasticity of the billet is improved, and the stale period of the general powder is 24-48/hour.
The factors affecting the milling efficiency and the quality of the powder are multi-faceted. Some are related and restricted. The production process should be adjusted according to the actual production conditions to improve the production efficiency.
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