Factors that reduce the efficiency of classifiers

The classifier is a common equipment for beneficiation. The sludge content and particle size composition of the feed, the density and shape of the ore, etc.; the structure of the equipment and the operation method will affect its operation effect.

1. The mud content and particle size composition of the feed to the classifier

The more sludge or fine grades in the feed of the classifier, the greater the viscosity of the pulp, the smaller the sedimentation velocity of the mineral particles in the pulp, and the coarser the size of the overflow product; in this case, in order to ensure the If the overflow fineness meets the requirements, the supplementary water can be appropriately increased to reduce the slurry concentration. If the mud content in the feed is small, or it has been subjected to desliming treatment, the slurry concentration should be appropriately increased to reduce the excessive fine-grained materials entrained in the returned sand.

 

2. Density and particle shape of ore

Under the same concentration and other conditions, the smaller the density of the material in the classifier, the larger the viscosity of the pulp, and the coarser the size of the overflow product; on the contrary, the higher the density of the material in the classifier, the smaller the viscosity of the pulp, and the larger the size of the overflow product. Fine, the fine-grained content in the returned sand increases. Therefore, when the density of the classifier is high, the concentration of the classifier should be appropriately increased; and when the density of the classifier is small, the concentration of the classifier should be appropriately reduced. Since flat ore particles settle slower than round or nearly round ore particles, a lower slurry concentration should be used in the classifier, or the discharge rate of the overflow product should be accelerated.

 

3. The inclination of the slot of the classifier

The inclination angle of the trough not only determines the settlement area of ​​the classifier, but also affects the agitation degree of the new blade to the pulp, thus affecting the quality of the overflow product. The inclination angle of the tank is small, the sedimentation area of ​​the classifier is large, the overflow particle size is finer, and the fine particle content in the returned sand increases; on the contrary, the inclination angle of the tank increases, the settlement area decreases, the coarse-grained material has more chances to slide down, and the overflow particle size increases. Coarse, but the sand return is less fine. Of course, after the classifier is installed, its inclination angle does not change, and it can only adapt to the determined inclination angle in terms of operating conditions.

 

4. The height of overflow weir

Adjusting the height of the overflow weir can change the size of the settlement area. When the overflow weir is increased, the settlement area of ​​the ore particles can be increased, and the volume of the classifier area can also be increased. Therefore, the agitation degree of the new type of slurry surface is relatively weak, which makes the overflow particle size smaller. When the overflow particle size is required to be coarse, the height of the overflow weir should be reduced.