1. INTRODUCTION

1.1.Types of dryers

a) Batch

- Tray dryer at atmospheric pressure or vacuum.

- Mixed batch dryer at atmospheric pressure or vacuum.

- Rotary dryer at atmospheric pressure or vacuum.

b) Continuous

- Fluidized-bed dryer

- Continuous band dryer with cross circulation

- Pneumatic bed dryer

- Rotary dryer – direct or indirect

- Vertical dryer, with rotary trays

- Spray dryer

Then we see a series of images of different solid dryers described above which you can find in market.

One type of dryer widely used in mining is continuous rotary dryer. This is shown below: