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bond ball mill work index database jktech

bond ball mill work index database jktech

each crosses the 20% retained, or 80% passing, line at w = 10/P1 where w is the horizontal lineal X value at Y = 20. The total work input to the sample in KWH/ton divided by the work index Wi is w. The straight plotted distribution line follows the exponential equation: AX = log b log Y. where b is the Y intercept of the extended line, and A is the negative slope. The 80% passing size P is 100/w² microns. The exposure ratio Er is the quantity that expresses the lin...

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In a recent publication fifteen different ores each had grindability tests made at 28, 35, 48, 65 and 100 mesh, with many work index variations at the different product sizes. These tests are used here to develop empirical equations from which the work index at different product sizes can be computed from a grindability test at one size. In each of the 15 ores the data from the grindability test at 48 mesh alone were used to calculate the Wi values at 28, 35, 65, and 100 mesh, and these were compared with the actual values obtained by testing. In the calculation the exposure ratio Erp of each mesh product size was considered to be that determined by testing at 48 mesh, and Crp was determined from that value and the average P for each mesh size. The work index should theoretically be proportional to  P/Yn where Y is the percent weight of the feed retained on the mesh size tested. From this relationship Wi = K P/Y 1.67.. the exponent...

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The specific crack length Cr100 in centimeters per cc of solid for any material ground to 80% passing 100 microns with an exposure ratio Er is found from: Cr100 = log + 0.77/0.0125 Since joules per gram equals 3.97 times kWh/ short ton, the crack energy Ce in joules per centimeter is found from: Ce = 3.97 Wi100 Sg/Cr100. where Sg is the specific gravity. Combining Eq. and Eq. gives the following equation for calculating the crack energy in joules per centimeter directly from the standard work index and product exposure ratio: Ce = .0496 Wi100 Sg/log + 0.77. From Eq. and Table I, the ores tested have an average crack energy of 4.0 joules per centimeter. Since the work input varies as the crack length, or as the square root of the surface area, surface areas should not be used in computing the work required for...

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