REC «Mekhanobr-Teknika» (St. Petersburg, Russia):

Korovnikov A. N., Director for sales of equipment for ore materials processing, Candidate of Engineering Sciences, korovnikov_an@npk-mt.spb.ru

Uralmekhanobr JSC (Ekaterinburg, Russia):
Buzunova T. A., Senior Researcher, Candidate of Engineering Sciences

The study analyzes the practice of fine wet screening of slurry solids in ore processing for the last few years. The current urgency of the problem of replacing hydraulic density-based classification of finely ground ores with separation by geometric size is noted. The practice of processing low-grade finely disseminated ores shows that a significant proportion of mineral losses is due to the imperfection of the classification processes used in ore preparation, regrinding and final treatment of concentrated products. The prospects for reducing such losses are still directly related to the problem of high-quality grainsize separation of ground materials, most effectively solved through the use of fine screening. Process operations covering the application of fine screening in ore processing are shown. The results of vibrating screening studies for slurry solids are presented. The main process indicators for screen operation are established and the dependencies between them are shown. It is established that with the feed rate of 2 t/h, the solid content in the feed of 30 %, the vibration amplitude of 1.5 mm, the inclination of 18.5° and the addition of water for sieve irrigation, the screening efficiency for the size class of –0.2 mm increases from 80 % to 86 %. Ways of increasing the efficiency of slurry solids screening on a vibrating screen are shown. The main factors affecting the efficiency of the fine wet screening process are established.
The work was performed with the financial aid of the Ministry of Science and Higher Education under Grant Agreement No. 14.579.21.0133 of October 3, 2016 (UIPNI RFMEFI57916X0133).

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