بررسی تأثیر درصد مگنتیت بر ویژگی‎های مکانیکی و لرزه‌ای کانسنگ‌های آهن: مطالعه موردی کانسنگ معدن چادرملو

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود، شاهرود، ایران

2 دانشیار، دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود، شاهرود، ایران

3 استاد، دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود، شاهرود، ایران

چکیده

بررسی عوامل مؤثر بر ویژگی‎های مکانیکی و فیزیکی موادمعدنی از متغیرهای بسیار مهم و با اهمیت در تعیین ویژگی‎های شکست و رفتار مکانیک‌ سنگی آنهاست. این بررسی‌ها می‌تواند کمک شایانی در مراحل مختلف عملیات معدنکاری از حفاری و انفجار تا خردایش مکانیکی (سنگ‌شکنی و آسیا) و برنامه‌ریزی تولید کند. در این پژوهش ابتدا مقاطع میکروسکوپی اکسیدهای آهن در معدن سنگ آهن چادرملو در نورهای مختلف مورد مطالعه قرار گرفت. سپس متغیرهای ژئومکانیکی و لرزه‌ای و ویژگی‎های شکست کانه‌های آهن نسبت به درصد مگنتیت آزمایش و بررسی شد. نتایج آزمایش‌ها نشان می‌داد که با افزایش درصد مگنتیت متغیرهای مقاومت فشاری، کششی تک‌محوره، مدول یانگ، سرعت انتشار موج P و سرعت انتشار موج S افزایش و متغیرهای نسبت پواسون، تخلخل و جدب آب کاهش می‌یابد. در مرحله پایانی این پژوهش ارتباط میان نرم‌شدگی ناشی از انفجار با میزان درصد مگنتیت بررسی شد. نتایج نشان داد که با افزایش درصد مگنتیت، نرم‌شدگی ناشی از انفجار نیز افزایش می‌یابد، که این امر سبب کاهش هزینه‌های بسیار زیاد خردایش مکانیکی می‌شود و در صورتی‌ که درصد مگنتیت بار ورودی به کارخانه در معدن سنگ آهن چادرملو از 25 تا 50 درصد افزایش یابد، میزان مصرف انرژی از 70 کیلووات بر ساعت به 40 کیلووات بر ساعت کاهش می‌یابد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of effect of magnetite percent on geomechanical and seismic parameters: case study Chadormalu ore deposit

نویسندگان [English]

  • H. Inanloo Arabi Shad 1
  • F. Sereshki 2
  • M. Ataei 3
  • M.d Karamoozian 2
1 PhD. Student, Department of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran
2 Associate Professor, Department of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran
3 Professor, Department of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran
چکیده [English]

Investigation of effective parameters on mechanical and physical properties of ore deposits is very important in determination of their rock mechanic and failure properties. This investigation can be suitable in different mining operations such as drilling, blasting, comminution and mine planning. In this paper, at first, microscopic sections were studied under different lights in Chadormalu iron ore mine. Then geomechanical and seismic properties as well as failure behaviour of the oxide ores (magnetite and hematite) were studied. The results demonstrated that the percentage of magnetite has a direct relationship with uniaxial compressive strength, tensile strength, Young modulus and P and S wave velocities; and the magnetite percentage has an inverse relationship with Poisson's ratio, porosity and saturation. Finally, the relation between magnetite percent and blast-induced preconditioning was investigated. The results showed that increasing the percentage of magnetite will increase the blast-induced preconditioning and increasing preconditioning decreased comminution processes in the Chadormalu iron ore mine. Also increasing the percentage of magnetite in feed of process factory from 25 to 50% decreases the power consumption from 70 (KWh/t) to 40 (KWh/t).

کلیدواژه‌ها [English]

  • Iron oxides deposit
  • Magnetite percent
  • geomechanical parameters
  • Failure properties
  • Preconditioning

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