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# Answer to Question #210484 in Chemical Engineering for 62829

Question #210484

In a cement manufacturing unit, 36 tonne/h of calcite of 5-cm size is fed to a gyratory crusher. Screen analysis from the crusher shows a surface area of product of 61.7 m2/kg. Thecrushed material is then subjected to fine reduction in a hammer mill. Mill product analysis indicates a surface area of 740 m2/kg. Rittinger s number for calcite is 75.9 cm2/kg.cm. Efficiency of the grinder is 30%. The crusher and grinder are driven on the same shaft (by

an electric motor) whose transmission efficiency is 90%. If 480 hp is fed at

the other end of the shaft, compute the efficiency of the crusher.

1
2021-06-28T03:16:02-0400

The efficiency of the crusher "=1- \\frac{Density \\space of \\space calcite}{Specific \\space surface \\space ratio \\space for \\space the \\space feed}"

The efficiency of the crusher "= 1- \\frac{2.65}{3.5}= 0.25714 \\implies 25.714 \\%"

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