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Dimensions, Exterior Surfaces, Volumes, Densities and Shape Factors for Particles of Crushed Colorado Oil Shale in Two Narrow Sieve Fractions

机译:两种窄筛分馏分中粉碎的科罗拉多油页岩颗粒的尺寸,外表面,体积,密度和形状因子

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Two sieve fractions, spanning a wide range of particle sizes, were prepared by crushing and screening grab samples of Colorado shale. The two screen ranges were 3/4 to 1 in. (1.91 to 2.54 cm) and 5/16 to 3/8 in. (0.79 to 0.95 cm). From each sieve fraction, 50 particles were chosen and cleaned. The quantities measured on each pebble were: the length, L, the size, W, the mass, M, the volume, V, the density, rho, and the exterior surface area, A. Volume and density were determined by weighing in air and in water; surface area was determined by measuring the mass of parylene polymer coating applied. From these quantities were calculated various shape factors: L/W, f/sub A/ = A/w exp 2 , the sphericity, f/sub V/ = V/W exp 3 , and the specific-surface ratio, n = WA/6V. The major conclusions are: (1) The mean second-largest dimension (W) is slightly larger than the opening of the larger screen. (2) The specific surface, A/V, is 12.5/D/sub p/. (3) The probability distributions of L/W and other shape factors have all been quantified. L/W has a Weibull distribution, severely right-skewed, while sphericity and specific-surface ratio are normally distributed and f/sub A/ and f/sub V/ are lognormally distributed. (ERA citation 07:006746)

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