How does grading process and what is the principle behind it?

According to their different sedimentation rates, hydraulic classification divides mixed materials with different particle sizes into several levels in water.

When ore particles have the same specific gravity, the larger particle size will sediment faster, and the smaller particle size will sediment slower. Therefore, it can be divided into different particle size grades according to the sedimentation of ore particles.

The machine that divides the material into several grades according to its settling speed in the liquid medium is called a classifier. The settled coarse-grained part is called grit, which is discharged by mechanical device (screw or rake), and the suspended fine-grained part is called overflow, which is discharged by water flow.

What are the main factors affecting the grading process?

There are many factors that affect the grading process. The properties of the ore include: the mud content and particle size in the material fed into the classifier, the specific gravity and shape of the ore: the factors of the machine structure are: the size of the inclination angle of the tank, the rotation speed of the screw shaft, the width of the tank, and the operation. Factors include: slurry concentration, ore feeding amount and the uniformity of ore feeding, and the level of overflow weir.