Since increasing the amount of sand returned within a certain range can reduce over-grinding and promote a more uniform particle size of the final product, thereby increasing the productivity of the mill. However, when the ratio of return sand is too large, the productivity will not increase, but will cause overload of the mill and classifier. The swelling phenomenon of the lattice type ball mill and the decrease of the efficiency of the extension, and the excessive amount of sand returning are also one of the reasons. The small amount of sand returned mainly affects productivity.
The return sand ratio is controlled between 300-500%, that is, the amount of sand return is 3-5 times that of the original ore, and the effect is better.
Practice has proved that the return sand of hard ore is larger than that of soft ore when the total load is the same.
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