Glass Lined double-conical rotary vacuum dryer is a multi-purpose machine. It is suitable for vacuum drying and mixing of powder and granular materials. It can also be used for concentration of chemical reaction solution, especially for drying materials containing toxic gases and solvents to be recovered. Double-conical rotary vacuum dryer is suitable for the raw materials that need to concentrate, mixed and dried at low temperature (for example, biochemistry) products in chemical, pharmaceutical and foodstuff industries.