CONTROL OF IRON ORE FRAGMENTATION BY BLASTING-WAY OF IMPROVEMENT OF PROCESSING EFFICIENCY

Energy consumption of iron ore milling is analyzed. It is emphasized that ore milling aimed to dissociate mineral grains is the most energy-consuming and expensive process in the production chain of concentrate. It is found that stretching of the dynamic impulse improves specific output of milling of explosive rupture products. For the conditions of the Far East ferruginous quartzite deposit with magnetite grains 42–44 μm in size, this trend of extension of rock mass exposure time under explosion wave is highly suitable. Wave pre-failure facilitates rock crushing down to standard quality size. Rocks subjected to explosive pre-rupture consume less energy in milling. Under multiple cyclic effect produced on rocks and ore body by stress waves of subsequent blasting with longer delays for better fracturing, it is possible to achieve selective dissociation of magnetite grains at the same explosive consumption. From the results of five years-long experience of rock shattering by blasting at increased delay intervals to 150–200 ms, it is found that the increased delay intervals in successive blasting of holes enable a 5–7 time increase in exposure time of rock mass under multiple alternative loads, first of all, under tensile stresses. For the conditions of alternations of iron ore and overburden areas, it is suggested to carry out blasting with pre-failure zone generation with modeling large scale blast propagation in space and time for the specific blast pattern.

For citation: Leschinsky A. V., Shevkun E. B., Lysak Yu. A. Control of iron ore fragmentation by blasting—way of improvement of processing efficiencyGornyy informatsionno-analiticheskiy byulleten'. 2019;4:41-52. [In Russ]. DOI: 10.25018/0236-1493-2019-04-0-41-52.

Keywords

Еxplosive shattering of iron ore, delay interval, milling, concentrate, advance rock fracture, extended delay intervals, single blast holes, joint system formation, compression and tension forces in rocks.

Issue number: 4
Year: 2019
ISBN: 0236-1493
UDK: 622.235: 622.73
DOI: 10.25018/0236-1493-2019-04-0-41-52
Authors: Leschinsky A. V., Shevkun E. B., Lysak Yu. A.

About authors: A.V. Leschinsky (1), Doctor of Technical Sciences, Professor, Assistant Professor, e-mail: 000399@pnu.edu.ru, E.B. Shevkun (1), Doctor of Technical Sciences, Professor, Assistant Professor, e-mail: ev.shevkun@yandex.ru, Yu.A. Lysak, General Director, Open Company «AVT-Amur», e-mail: Lysak-y@pokrmine.ru, 675000, Blagoveshchensk, Russia, 1) Pacific National University, 680035, Khabarovsk, Russia. Corresponding author: A.V. Leschinsky, e-mail: 000399@pnu.edu.ru.

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