Ural State Mining University (Ekaterinburg, Russia):

Kozin V. Z., Head of Chair, Doctor of Engineering Sciences, Professor, gmf.dek@ursmu.ru
Komlev A. S., Engineer, Candidate of Engineering Sciences, tails2002@inbox.ru

Longitudinal section method in sampling and sample analysis on streams is used with application of slurry and lump products automatic analyzers. It permits to design and introduce simple and compact sampling systems into commercial practice. The formulas for random error calculation with respect to slurry and lump products’ point samples were obtained. It is shown, that point sample error may be low for slurry, but significantly higher for lump products. Number of point samples in sampling and sample analysis by longitudinal section method is limited by point sample sampling or analysis duration. As during correlation time of analyzed component mass fraction several point samples are taken on stream, it leads to reduction of neighboring samples informational content. On the average, samples informational content is reduced approximately by the factor of two. A new formula for point samples number calculation with respect to selected control period, taking account of reduction of neighboring samples informational content, as well as changes in point samples dispersion during their sampling or analysis, is proposed. As at concentrating plants time interval between point samples taking is established on the basis of technological capabilities of samplers or analyzers, a formula is presented for integrated sample error calculation taking account of reduction of neighboring samples informational content. This formula may be used for integrated sample error calculation, selected both by a transversal and a longitudinal section method.

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