Document Type : Research Article
Authors
1
Petroleum Department-Engineering Faculty-Shahid Bahonar University of Kerman Kerman-Iran
2
Department of Mining Engineering- Azad University- Sirjan-Iran
3
Dept. of Mining and Metallurgy, Yazd University
10.22034/anm.2024.20099.1596
Abstract
Blasting operation is one of the most important and costly operations in the mining process. In fact, blasting is the beginning of the rock comminution system in the mine. The dimensions of the blasted product will play a significant role in the ability of stone crushing and grinding, for this reason, in order to produce a product with suitable dimensions, it is first necessary to obtain sufficient knowledge of the physical, mechanical, and chemical conditions of mineral blocks. In this research, by studying 26 iron ore blocks of Choghart mine, after the blasting operation, the physical, mechanical, and chemical characteristics of the ore blocks were taken. In the following, after the blasting operation, by taking pictures from the surface of the exploded block, an image analysis of the dimensions of the blasting product was carried out. In the next step, stone samples were taken from the surface of the fired block to conduct geomechanical and chemical tests. After conducting the tests, the relationship between the physical, chemical, and mechanical characteristics of the tested stones with the dimensions of the Blast products (D50) was investigated. The characteristics examined in this study include uniaxial compressive strength, modulus of elasticity, Poisson's ratio, indirect tensile strength, cohesion, internal friction angle, and percentage of silica, iron, and iron oxide in the Blasted block. Finally, using univariate and multivariate linear regression statistical analysis, equations to estimate the dimensions of the product (D50) resulting from the blasting using the physical, mechanical, and chemical characteristics of the rock masses of the explosive product. With coefficients of determination (R2) 92.48% for D50 were predicted.
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