Analysis of Screen Effectiveness for Removing Undesired Fine Material in Powdered Coal

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In this problem, powdered coal with a specified screen analysis is fed to a vibrating 48 mesh screen to remove undesired fine material. The oversize and undersize analysis for the screen were recorded when new and after 3 months of operation. The effectiveness of the old and new screens is to be calculated based on the given data.

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SCREENING PROBLEM NO. 6 MARY MAE M. BUENSUCESO

PROBLEM 6 Powdered coal with the screen analysis given below as feed is fed to a vibrating 48 mesh screen in an attempt to remove the undesired fine material. When the screen was new, the oversize and the undersize analysis were as listed under the columns headed as new . After 3 months operation, the analyses are as headed as old . What is the effectiveness of the old and new screen?

PROBLEM 6 Mesh Feed Oversize (new) 0.012 0.027 0.078 0.1 0.126 0.204 0.162 0.125 0.117 0.029 0.015 0.005 Oversize (old) 0.014 0.031 0.088 0.112 0.142 0.229 0.182 0.104 0.065 0.025 0.008 Undersize (new) Undersize (old) 3/4 4/6 6/8 8/10 10/14 14/20 20/28 28/35 35/48 48/65 65/100 100/150 150/200 -200 0.01 0.022 0.063 0.081 0.102 0.165 0.131 0.101 0.095 0.07 0.047 0.031 0.02 0.062 1 0.093 0.171 0.186 0.146 0.111 0.071 0.222 1 0.246 0.183 0.141 0.105 0.325 1 1 1