Potential Role of Particle Characteristics on Coal Mine Respirable Dust Standards
Compliance standards for respirable dust, which are reduced because of high quartz concentrations, have become an industry-wide problem. Research on the physical and chemical character of quartz-classified particles in respirable coal mine dusts indicates that they may exist in intermixed layers or may be coated by clay or coal material. The relative amount of intermixing varies with the coal seam being mined. If most of the quartz particles of a mine dust are 'pure,' then the dust may have a high fibrogenic risk potential because of truly free silica and the compliance standard should be lowered. If, however, the quartz is locked inside another material matrix, or coated, a reduced compliance standard may not be appropriate.
R. L. Grayson, "Potential Role of Particle Characteristics on Coal Mine Respirable Dust Standards," Mining Engineering, Society for Mining, Metallurgy & Exploration Inc. (SME), Jan 1991.
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© 1991 Society for Mining, Metallurgy & Exploration Inc. (SME), All rights reserved.
01 Jan 1991