نشریه مهندسی معدن

نشریه مهندسی معدن

بررسی تابع شکست و انتخاب در کانی‌های کم عیار آهن با آسیای غلطکی فشار بالا

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشگاه صنعتی سهند
2 مهندسی معدن، دانشگاه صنعتی سهند
چکیده
آسیای غلتکی فشار بالا (HPGR) مدت زیادی است که در صنعت خردایش مواد معدنی مورد استفاده قرار می‌گیرد و دارای مزیت‌هایی از جمله کاهش مصرف انرژی و افزایش درجه آزادی است. در این تحقیق، تاثیر خردایش با HPGR و روش‌های سنتی خردایش بر روی نمونه کم عیار آهن با تابع شکست و انتخاب مورد بررسی قرار گرفت. تابع شکست به روش بقوبه، هربست فورستانو و هربست فورستانو اصلاح شده محاسبه شد و مشاهده شد که در اکثر ابعاد HPGR باعث افزایش تابع شکست (Bij) می‌شود و این به این معنی است که  میزان درصد عبوری از یک سرند خاص بعد از آسیا شدن، در محصول HPGR بیشتر است؛ اما با ریزتر شدن ذرات این اختلاف کم می‌شود. نتایج تابع انتخاب نشان داد که خردایش باHPGR  باعث افزایش سینتیک خردایش می‌شود. همچنین می‌توان مشاهده کرد که تابع انتخاب نمونه‌ها تا اندازه 410/1+680/1- میلی‌متر افزایش‌ یافته و بعد از آن کاهش پیدا کردند که بیانگر این است که بیشترین آهنگ شکست در این سایز اتفاق افتاده است. نتایج به‌دست آمده از روش برادبنت-کالکات نشان داد که مقدار  برای هر اندازه متفاوت است؛ به عبارتی تابع شکست نمونه‌ها غیرنرمال شونده‌اند، از طرفی مقدار  برای نمونه‌های خرد شده با HPGR کمتر از روش سنتی است که نشان‌دهنده تولید ذرات ریزتر به وسیله HPGR است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Comparison of Hpgr and Traditional Breakage Methods on Breakage Function and Selection Function of Low-Grade Iron Ore

نویسندگان English

Parviz Pourghahramani 1
Paniz habibzadeh 2
1 Mining Engineering Faculty Sahand University of Technology
2 mineral processing, mining faculty, sahand university of technology
چکیده English

High-pressure grinding rolls(HPGR) have been widely used in the mineral crushing industry due to their energy efficiency and improved mineral liberation. This research examined the effect of HPGR and traditional crushing methods on low-grade iron ores' breakage and selection functions. The breakage function was calculated using Bẻrubẻ, Herbest & Fuerstenau, and Modified Herbst & Fuerstenau methods, and it was observed that HPGR increases the breakage function (Bi1) for most size fractions, resulting in higher percentages of finer particles after grinding compared to traditional crushing methods. However, this difference diminishes as the particle size decreases. The selection function analysis showed that HPGR increased particle breakage rate compared to traditional methods. Moreover, the selection function of the samples peaked at -1.410+1.680 mm before declining, suggesting that the highest breakage rate occurred at this size. The Broadbent-Calcut method also revealed that the value of Φ varied for different sizes, indicating a non-normalized breakage function. Additionally, the value of γ for HPGR-crushed samples was lower than traditional methods, indicating that HPGR produced finer particles.

کلیدواژه‌ها English

HPGR
Iron ores
Breakage function
Selection function
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دوره 19، شماره 64
پاییز 1403
صفحه 81-99

  • تاریخ دریافت 01 تیر 1403
  • تاریخ بازنگری 29 شهریور 1403
  • تاریخ پذیرش 03 آذر 1403