Selection should be based on feed form, moisture content, dispersion behavior, required evaporation duty, thermal sensitivity, target final moisture, particle requirements, collection method, available utilities, and site constraints. Material testing is recommended when the conveying or drying behavior is uncertain.

Suitable filter cakes and pastes may be evaluated for the XSG spin flash route because it combines mechanical dispersion with rapid drying. Direct processing depends on the material's structure, stickiness, moisture, feeding stability, and required product condition.

They are influenced by feed rate, air temperature and volume, dispersion, gas velocity, drying-path or stage arrangement, residence behavior, and product separation. The relevant variables are confirmed together for the selected series and material.