Ammonium Metatungstate Spray Dryer Existing Problems

Ammonium metatungstate spray dryer existing problems are listed as below:

1.Wall sticking phenomenon. Wet powder sticks in the drying chamber. The main reasons are: feeding amount exceed standard so it can not fully evaporate; before starting the drying process, the temperature of drying chamber is insufficient; after starting spraying, the feed speed is too fast.

2.Moisture content of product is too high. Low ventilating out temperature is the main reason that would affect the moisture content. Ventilating out temperature can be adjusted via feeding amount. So reduce the feeding amount will raise ventilating out temperature.

3.Finished product is of low purity. It is mainly because the air filtration is inefficient; incomplete cleaning of drying machine causes residual powder mixes up with finished product.

4.Grain size of finished product is too fine. This will affect ammonium metatungstate solubility and flow ability. It is mainly caused by the low solid content of liquid material.  



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