Empress Catherine II Saint-Petersburg Mining University, Saint-Petersburg, Russia

T. N. Aleksandrova, Head of Department, Doctor of Engineering Sciences, Corresponding Member of the Russian Academy of Sciences

V. V. Kuznetsov, Departmental Assistant, Candidate of Engineering Sciences, kuznetsov@vvalen.ru

Metalloinvest, Stary Oskol, Russia¹ ; Academician Melnikov Institute of Comprehensive Exploitation of Mineral Resources—IPKON, Russian Academy of Sciences, Moscow, Russia²
A. V. Chanturia, Head of Technical Expertise Office for Production Sustainability and Modernization Projects at Mining Division¹, Post-Graduate Student²

The prevailing trend in the sphere of iron ore reserves and resources of the Russian Federation is their replenishment by means of processing of rebellious and low-grade ore. The major difficulty here is the required high capacity of processing flowsheets, which conditions a very high energy consumption. A potential of the higher energy efficiency is offered by the ore pretreatment stimulation approaches which consist in intensification of selectivity of mineral disintegration by means of various physical and chemical effects. Stimulation of ore pretreatment utilized contrast strength characteristics of mineral components, which provided a product with the assigned size distribution of the components owing to different fracture velocities of disintegration of aggregates with different ratios of ore and rock percentage. Removal of aggregates with the higher fracture velocities makes it possible to decrease the circulating load and the required capacity at the subsequent stages, which greatly reduces energy consumption and possible overgrinding of useful components. Treatment of lumpy samples of unoxidized ferruginous quartzite by softening reagents decreases strength of lumps and, consequently, leads to a decrease in the coarseness of lumps which are most sensitive to disintegration. This study focuses on applicability of chemical stimulators of disintegration at the stage of wet autogenous milling of unoxidized ferruginous quartzite. On the basis of experimental and theoretical research of disintegration ability of the test raw material, drop-weight testing and interpretation of the test results using a proposed efficiency criterion of stimulation effect, the parameters are calculated for simulation modeling of an autogenous milling flowsheet. Using the modeling results, it is forecasted that the energy consumption decreases when disintegration stimulators are involved.

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