Lower size grade limits in ore pretreatment using X-ray fluorescent separation

The information-based dressing is a promising approach to coarse mineral processing. The use of surface indicators of separation in such information-based dressing techniques as optical, X-ray luminescence and, specifically, X-ray fluorescence processing, dictates justification of size grade boundaries since, given a similar composition of elements, this is the size that has influence on the separation indicator value—spectral ratio (analytical parameter). The aim of this study is to find admissible limits for size grades for separators using collimatortype measurement systems. In the framework of the studies, separation tests were carried out on X-ray fluorescent separator SRF-100l and with test material represented by artificial samples of different size and different mass factions of components. The subsequent mathematical processing of the results included the analysis of the spectral ratio as the surface indicator of separation and the calculation of variation factor of this value. The studies have found that the lower size limit should be not lower than the half length of the collimator. In this case, the influence of the average linear size of a particle on the measurement accuracy of the particle composition is reduced. The results can be use in selecting machine size grades for materials to be processed on collimator-type X-ray fluorescent separators.

Ovchinnikova T. Yu., Efremova T. A., Tsypin E. F. Lower size grade limits in ore pretreatment using X-ray fluorescent separation . MIAB. Mining Inf. Anal. Bull. 2021;(11-1):328— 337. [In Russ]. DOI: 10.25018/0236_1493_2021_111_0_328.

Ovchinnikova T. Yu.¹, Cand. Sci. (Eng.), Associate Professor at the Mineral Processing Department, tatyana.ovchinnikova@m.ursmu.ru;
Efremova T. A.², Researcher of the Nonferrous Metal Ore and Manmade Waste Processing Laboratory, efremova_ta@umbr.ru;
Tsypin E. F.¹, Dr. Sci. (Eng.), Professor at the Mineral Processing Department, tsipin.e@ mail.ru;
¹ Ural State Mining University, 620144, Yekaterinburg, Kuibyshev St., 30. Russia;
² Uralmekhanobr, 620144, Yekaterinburg, Khokhryakov St., 87, Russia.

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