Examination of the preliminary gravity dressing influence on the Shalkiya deposit complex ore

Grinding of mineral raw materials of different composition in drum mills with rolling steel tumbling medium is one of the main processes for liberation of mineral complexes and preparation of raw materials for beneficiation. It is known that grinding is one of the most expensive and energy-intensive operations at the ore-preparation process stage. Capital and operational outlays at this stage may reach up to 70% of the factory-wide indicators. In this connection, the reduction of power consumption for the mineral ore-preparation, and especially for grinding, is the topical problem in the mineral dressing technology [1–2]. On a global scale, the Bond work index procedure is most often used to determine the ore grinding power consumption [3]. The scientific literature describes many ways to reduce the ore grinding costs [4–10]. Thus, in [4] the currently central line of solving the problem of improving the efficiency of crushing and grinding processes through the use of modern grinding and classification model-oriented adaptive control system is illustrated by the example of copper-molybdenum ores. The ore grade of quality on-line rating algorithm application for managing the processes is the main approach in this direction. The stability of regulation and quality of grinding of copper-molybdenum ores increases by 5–7% owing to application of such an approach to the industrial process. The principle of crushing in high-pressure rolls (HPR), which allows one to obtain a fine feed for mills, is of practical interest. The emergence of HRP has allowed modifying a multi-stage crushing scheme. The HRP crushing products are characterized not only by a diminished size, but also by a high content of small size grades and increased fissuring, which makes it possible to lessen the volume of mills during subsequent grinding by 30...50% [5]. The authors of [6] present the laboratory studies on the grinding efficiency depending on the grinding bodies used (balls or rods) for various parameters such as granulometric composition, lithological type of copper ore. Examination of the preliminary gravity dressing influence on the Shalkiya deposit complex ore