ハードグローブ試験機による粉砕進行指数の測定
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概要
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The standard method of testing grindability of coal by a Hardgrovemachine is commonly used to determine the relative grindability of various coals in comparison with the standard coal having 100 grindability. This method has not come into general use for materials other than coal. In this paper, a general method for determining grindability of materials other than coal by a Hardgrovemachine is proposed. The sample is crushed by a jaw crusher, and is graded between 1190 micron and 590 micron sieves. The sample weights 36ρ (kg), where ρ (kg/cm^3) is the true specific weight of the material, determined from the true volume experimentally measured by the Beckman air comparison pycnometer. The ground material after the single grinding cycle of 60 revolutions, is sieved on a set of sieves. The crushing extension index C_<EI> is calculated by C_<EI>=2.6(W/ρ)^2 where W(kg)= weight of material passing the 74 micron sieve, determined from the weight of the original sample (36ρ) minus the weight of the material retained on the 74 micron sieve. W/ρ(cm^3)= true volume of the material passing the 74 micron sieve. C_<EI> (cm^2/kgcm)= crushing extension index. It is independent of the crushing condition but characteristic of the material to be crushed. The specific surface increase ΔS and the residue R of the crushed product are expressed as follows: ΔS=C_<EI>A_r/ W_0 R=e^<-(0.006ρΔsx')>^<0.8> 1/x'=1/x - 1/x_0 where x is the particle size, x_0 the initial particle size, x' the modified particle size and A_r the crushing extension energy.
- 社団法人日本材料学会の論文
- 1983-03-15
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