بررسی ارتباط خواص شیمیایی، فیزیکی و مکانیک سنگی بلوک‌های آهن معدن چغارت، با مقدار D50 دانه‌بندی حاصل از آتشباری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده فنی و مهندسی، بخش معدن، دانشگاه آزاد اسلامی، واحد سیرجان، سیرجان، ایران

2 دانشکده نفت و مهندسی معدن، دانشگاه شهید باهنر، کرمان، ایران

3 دانشکده مهندسی معدن و متالورژی، دانشگاه یزد، یزد، ایران

چکیده

عملیات آتشباری یکی از مهم­ترین و پرهزینه‌ترین عملیات در فرایند معدنکاری است. آتشباری درواقع، ابتدای سیستم خردایش سنگ در معدن است. همچنین آتشباری تولیدکننده سنگ موردنیاز مراحل بعدی خردایش است. ابعاد محصول تولیدی آتشباری، نقش بسزایی در قابلیت خردایش سنگ­شکنی و آسیاکنی خواهد داشت، به این دلیل، جهت تولید محصول با ابعاد مناسب ابتدا لازم است شناخت کافی از شرایط فیزیکی، مکانیکی و شیمیایی بلوک­های معدنی حاصل شود. در این پژوهش با مطالعه 26 بلوک سنگ‌آهن معدن چغارت بعد از عملیات آتشباری، نسبت به برداشت ویژگی­های فیزیکی، مکانیکی و شیمیایی بلوک­های معدن چغارت اقدام شد. در ادامه، بعد از عملیات آتشباری با تصویربرداری از سطح بلوک منفجرشده، اقدام به آنالیز تصویری ابعاد محصول آتشباری گردید. در مرحله بعد، از سطح بلوک آتشباری شده نمونه­های سنگی­ای جهت انجام آزمایشات ژئومکانیکی و شیمیایی اخذ شد. بعد از انجام آزمایشات، ارتباط بین ویژگی­های فیزیکی، شیمیایی و مکانیکی سنگ­های مورد آزمایش با ابعاد محصول آتشباری (D50) موردبررسی قرار گرفت. ویژگی­های موردبررسی در این مطالعه شامل: مقاومت فشاری تک‌محوره، مدول الاستیسیته، ضریب پواسون، مقاومت کششی غیرمستقیم، چسبندگی، زاویه اصطکاک داخلی، درصد سیلیس، آهن و اکسید آهن موجود در بلوک آتشباری می­باشند. در پایان، با استفاده از روش­ تحلیل آماری رگرسیون خطی تک متغیره و چند متغیره، معادلاتی برای تخمین ابعاد محصول تولیدی (D50) حاصل از انفجار با استفاده از ویژگی­های فیزیکی، مکانیکی و شیمیایی توده­ سنگ­های محصول آتشباری با ضریب تعیین (48/92) درصد برای D50 پیش‌بینی گردید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the relationship between the chemical, physical, and mechanical properties of the iron blocks of Chagharat Mine, with the D50 value of the comminution resulting from blasting

نویسندگان [English]

  • Javad Kamali 1
  • Hossein Jalalifar 2
  • Alireza Yarahmadi Bafghi 3
1 Dept. of Mining Mechanical Engineering, Science and Research Branch, Islamic Azad University of Sirjan, Sirjan-Iran
2 Dept. of Mining Engineering, Shahid Bahonar University of Kerman, Iran
3 Dept. of Metallurgical and Materials Engineering, Yazd University, Yazd, Iran
چکیده [English]

Blasting operation is one of the most important and costly operations in the mining process. 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, 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 the Chogharat mine, after the blasting operation, the physical, mechanical, and chemical characteristics of the ore blocks were taken. In the following, after blasting operation, by taking pictures from surface of the exploded block, an image analysis of the dimensions of 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...

کلیدواژه‌ها [English]

  • Blasting
  • Rock fragmentation
  • Iron ore
  • Linear regression
  • uniaxial compressive strength
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