Irkutsk National Research Technical University (Irkutsk, Russia)

Novikov Yu. V., Postgraduate Student, 89500505553r@gmail.com
Vlasova V. V., Associate Professor, Candidate of Engineering Sciences, vlaver@istu.edu
Burdonov A. E., Associate Professor, PhD in Engineering Sciences, slimbul@inbox.ru

This article investigates the effect of temperature on the fragmentation behavior of gold-bearing ore, specifically sandstone-siltstone. The experimental study focused on the impact of varying temperature conditions on rock destruction processes. The strength characteristics of ore samples were evaluated at temperature intervals ranging from +20 °C to –20 °C, with measurements taken at 5 °C increments under conditions of natural moisture. For each temperature setting, comprehensive strength profiles were generated for the ore samples. Results indicate that, as temperature decreases, resistance to uniaxial compression increases, while resistance to uniaxial tension decreases. Regression models, developed using the Lasso and Ridge methods, quantitatively describe the relationship between temperature and strength characteristics. Additionally, the grain size distribution properties of the fractured samples were assessed. Microscopic analysis of the newly formed surfaces has confirmed the hypothesis that temperature variations influence the development of internal defects within the rock matrix. Based on these observations, the energy consumption required for ore breakage at different temperatures was calculated. The study has revealed that as the temperature drops from +20 °C to –20 °C, the specific energy required for achieving a target particle size increases by 0.328 kW·h/t. These findings are critical for optimizing mining and processing operations in environments with significant temperature fluctuations. The study underscores the importance of accounting for temperature-induced changes in rock strength and energy demands during ore extraction and processing, particularly in regions with extreme seasonal variations. The results contribute to the ongoing effort to improve efficiency and reduce costs in the mining industry under variable temperature conditions.

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