Multidimensional Analysis of Ore Spontaneous Combustion Tendency Based on IAHP and Improved Interval Approximation

To conduct a scientific and comprehensive analysis of the spontaneous combustion tendency of sulfide ores and improve the safety production level of sulfur mines, an indicator system for determining the spontaneous combustion tendency of sulfide ores and a comprehensive classification standard for the spontaneous combustion tendency of sulfide ores were constructed. Based on this, a multidimensional information comprehensive analysis model for ore spontaneous combustion tendency was constructed by combining the interval analytic hierarchy process (IAHP) and the improved interval approximation analysis method. The interval judgment matrix was constructed by the interval analytic hierarchy process, and the weight of the spontaneous combustion tendency for evaluation indicators was calculated. By improving the interval approximation analysis, the indicators of the ore spontaneous combustion tendency were analyzed in the form of interval numbers, and the information potential was deeply explored to obtain multidimensional information such as the grade of the ore spontaneous combustion tendency and the reliability of the ore spontaneous combustion tendency, and then the comprehensive grade of the ore spontaneous combustion tendency was determined. By using this model, a multidimensional information analysis was conducted on the spontaneous combustion tendency of each ore layer in a certain sulfur iron mine, with the indicators of the ore spontaneous combustion tendency as the interval number. It was found that the 30-day oxidation weight gain rate exerts the most significant influence on ore spontaneous combustion. The ore in ore layer no. 1 was prone to spontaneous combustion with relatively reliable results, while the ores in ore layers no. 2 and 3 were susceptible to self-heating with highly reliable results. This study provides a reference and guidance for the targeted prevention of ore spontaneous combustion in the mine.