Drum drying is a way to obtain dried materials directly from solution or slurry {solid suspension). This drying method is applied widely in various fields such as chemicals, pharmaceutical products, food, dye, and waste water treatment. In its basic operation, a liquid is fed on a rotary drum heated with steam supplied inside; its liquid film is attached on the drum surface; and while the drum turns, including water in the film is evaporated rapidly.
Dried materials are continuously scraped from the drum surface with a fixed knife easily.