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An Experimental Study of Particle Size and Size Distribution of Minerals Crushed by Impact.

St Clair HW; Brown RE
NTIS: PB 208 012 :19 pages
This report gives the results of an experimental study of the progressive changes that occur in particle size and size distribution when a homogeneous and isotropic mineral is subjected to crushing by impact. The mineral used in the study was uniformly sized quartz, which was crushed in a simple drop-weight machine that applied impact energy up to about 100 kg-cm per g. Screen analyses of the crushed products were effected by the method of moments to determine the mean size, variance, skewness, and kurtosis. Analysis of the data from these experiments shows that the mean size of the crushed product is a function of the energy input and the initial size. The size distribution is functionally related to the degree of size reduction. As the mean particle size is decreased, at first there is a corresponding increase in the variance and decrease in the skewness. But, as size reduction is carried further, each tends eventually to approach a steady value, and the form of the size distribution becomes stable.
Publication Date
Document Type
IH; Report of Investigation;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 7615
NIOSH Division
Source Name
NTIS: PB 208 012
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division