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What is the return sand ratio? How to calculate?
In the closed-circuit grinding operation, the grader that returns to the grinding machine for re-grinding is called sand returning. The ratio of the amount of sand returned to the original ore amount of the mill is called the return sand ratio and can be expressed as a percentage. Its calculation formula is as follows:
100(β-α)
C = ————————%
— — θ
Where C - return sand ratio, %;
Α—the yield of a specified fraction in the ore discharge of the mill, %;
Β——the yield of the above specified fraction in the overflow of the classifier, %;
θ - the yield of the above specified fraction in the sand return of the classifier, %.
After the ore discharge from the grinding machine, the sand returning from the classifier and the overflow sampling and analysis, and the values ​​of α, β and θ are obtained, the returning sand ratio can be calculated according to the above formula.Next Article
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