What effect does mineral pulp concentration have on classification?

What is the influence of pulp concentration on classification effect? Why can’t the concentration be too low?

The viscosity of the pulp is also reduced when the pulp concentration is low. Therefore, the sedimentation speed of the ore particles is also accelerated, and the particle size of the overflow product obtained is also finer. Conversely, the overflow product particle size is coarser.
However, it should be pointed out that when the pulp concentration is reduced to a certain level, if the concentration continues to decrease, the particle size of the overflow product will become coarser. The main reason is that when the concentration decreases a lot, the volume of the pulp (or the amount of pulp) is also very large, so that the pulp flow rate (upward flow rate and horizontal flow rate) in the classifier also increases. Consequently, the coarser ore particles are also flushed into the overflow product. In order to comply with regulations, pulp concentration must be reasonably controlled.

 

It is said that the amount of ore entering the classifier should be appropriate and the ore feeding should be uniform. Why is this so?

During periods of constant slurry concentration, increasing ore feeding into the classifier results in an increase in flow rate, which causes the overflow product to become coarser. When the amount of ore decreases, the particle size of the overflow product becomes finer, and the content of fine particles in the returned sand also increases.
Therefore, the ore feeding amount of the classifier should be appropriate. In particular, the ore feeding should be uniform, and the fluctuation range should be as small as possible, so that the classifier can work under normal processing conditions and obtain a good classification effect.

 

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