کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
234509 465416 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mineral comminution: Energy efficiency considerations
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Mineral comminution: Energy efficiency considerations
چکیده انگلیسی

The energy efficiency of comminution processes is very low based on the energy required to generate new fracture surface area relative to the mechanical (strain) energy input. However, the maximum ideal limiting efficiency ELimit against which actual efficiencies may be compared is unknown. Therefore, theoretical analyses were undertaken to determine ELimit for a compressive loading comminution machine based on the stress state in a single particle containing a central crack (flaw). The analyses show that ELimit increases with increasing Poisson’s ratio ν, having values of ∼5%, ∼7.5% and ∼9% at ν ∼0, ∼0.2 and ∼0.39, respectively. Actual energy efficiencies, EB, expressed in terms of the energy required to create new fracture surface area relative to the work input, using standard Bond work index values, are lower in the range <1% to ∼2%. The relative efficiency ratio EB/ELimit varies from ∼3% to ∼26%, depending on the mineral, and is considered to be a more useful (practical) measure of efficiency because it gives a better assessment of behaviour relative to the limiting situation. It is concluded from the EB/ELimit ratios that the potential exists to improve comminution efficiencies by two or three times. Possible methods of achieving this are discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Minerals Engineering - Volume 21, Issue 8, July 2008, Pages 613–620
نویسندگان
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