Sampling of coarse products

Processing plants are fed with ore with maximum size of 200–300 mm. Such ore is subjected to grab sampling which produces systemic error. Mechanical sampling has cumbersome equipment and is rarely introduced. The analysis and synthesis of mechanical sampling facilities allows an efficient approach to engineering and introduction of such equipment. The analysis is based on the calculation of random errors in sampling, preparation and examination of coarse samples. The calculations are performed in terms of copper and gold ore. The calculated relative errors of sampling, preparation and examination of samples show that sampling of copper and gold ores should be different. In terms of copper ore, it is important to increase the number of snap samples, while for gold ore, it is necessary to add the mass of the samples and add the gold sample preparation with concentration stages of coarse gold. In the article, five variants of coarse ore sampling are compared. The currently used variants of grab and mechanical sampling offer an acceptable result only with implementation of the proposed flowsheets. The look-ahead variants include disintegration of coarse particles and small mass sampling, or larger mass sampling directly on the conveyor. Both look-ahead variants need design studies and pilot testing. Examples of sampling circuit design are given, which offers an efficient tool for the analysis and synthesis of sampling circuits.

Kozin V.Z., Komlev A.S. Sampling of coarse products. MIAB. Mining Inf. Anal. Bull. 2020;(3-1):410-421. [In Russ]. DOI: 10.25018/0236-1493-2020-31-0-410-421.

Kozin V.Z.¹, Dr. Sci. (Eng.), Dean of the Rock Mechanics Faculty, gmf.dek@ursmu.ru,
Komlev A.S.¹, Cand. Sci. (Eng.), Senior Researcher, gmf.dek@ursmu.ru,
¹ Ural State Mining University, Yekaterinburg, Russia.

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