. Transactions. Size Opening in Inches Fig. 2. The mass of data accumulated by these tests is only partially givenbelow, as time at present will not permit a complete analysis. I realizethat the method here adopted has its drawbacks, and yet, with all con- LUTHER W. LENNOX 239 ditions identical, the screen tests of the products should at least give anindication of the relative grinding resistances of the ores. One objec-tionable feature is the small size of the grinder, although the labor in-. Size Opening in Inches Fig. 3. 100 so M > 40 ao N^v \ \ \>A\\* \ \ Plot v* \\ • \<J» t
. Transactions. Size Opening in Inches Fig. 2. The mass of data accumulated by these tests is only partially givenbelow, as time at present will not permit a complete analysis. I realizethat the method here adopted has its drawbacks, and yet, with all con- LUTHER W. LENNOX 239 ditions identical, the screen tests of the products should at least give anindication of the relative grinding resistances of the ores. One objec-tionable feature is the small size of the grinder, although the labor in-. Size Opening in Inches Fig. 3. 100 so M > 40 ao N^v \ \ \>A\\* \ \ Plot v* \\ • \<J» t i 1 1. §l\ i =1 ft PreparedStandard Feed Mesh Cum. %Retained 10 14 20 28 35 48 65 100 150 200 Size Opening in Inches Fig. 4. volved in drying, cutting down, and screening the product of a largermachine would be burdensome. The small size also necessitated acomparatively fine feed. 240 GRINDING RESISTANCE OF VARIOUS ORES The method adopted for computing the results is that of Rittinger,based on the law that work done in crushing is proportional to thesurface exposed by the operation, or to the reciprocal of the plotting the screen tests, the mesh (reciprocal of diameter) and thecumulative per cent, of oversize are used as coordinates. The area between the feed and productcurves will be proportional to theapparent work done. The ap-parent work is in turn inverselyproportional to the resistance ofthe ore to grin
Size: 2055px × 1216px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
