Challenge
Magnesium sulfate is an inorganic salt and strongly hygroscopic. Conventional slow drying took a long time, and the material readily re-absorbed moisture during drying and formed hard lumps, requiring extra crushing of the finished product.
Solution
A flash airflow drying approach raised the hot air temperature and shortened the dwell time inside the drying tube, intensifying instantaneous dewatering and reducing the time spent in the wet zone, which suppressed caking.
Result
Drying efficiency improved, caking in the finished product was reduced and the load on the subsequent crushing stage fell accordingly.
Equipment in this case
Flash Airflow Dryer
Capacity varies with operating conditions and is confirmed by a trial run; parameters fixed by machine size, such as air volume, can be stated precisely.
Related questions
Flash airflow dryer or rotary dryer: which one?
The two have different structures and suit different duties:
Flash airflow dryer
It dewaters through brief contact between high-temperature air and the material. Drying is fast, which suits inorganic salts and chemical powders that need rapid dewatering. Sizes are Φ220, Φ280, Φ325, Φ400, Φ500 and Φ600.
Rotary dryer
The rotating drum tumbles the material for more even heating. It suits sawdust, plastic pellets and flake materials that do not break up while tumbling.
How to decide
Look at the material form and whether it is sticky. Powders and fast-dewatering duties point to flash airflow; granular or flake materials needing even heating point to rotary. The moisture content and target final moisture still have to be considered.
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