Estimating specific energy from the brittleness indexes in cutting metallic ores
Yükleniyor...
Tarih
2016
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
South African Institute of Mining and Metallurgy
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Specific energy (SE) is a very useful parameter for assessing rock excavation by machine. Predicting the SE from the brittleness will be practical, especially for preliminary studies, due to the fact that determining the SE from cutting tests is difficult and expensive. In this study, the predictability of the SE from different brittleness concepts was investigated for metallic ores such as chromite, haematite, galena, and smithsonite. Uniaxial compressive strength, Brazilian tensile strength, impact strength, and small-scale cutting tests were carried out in the laboratory. The SE values were calculated from the cutting tests and correlated with three different brittleness concepts. A significant correlation could not be found between the SE and the brittleness B-3 (the ratio of compressive strength minus tensile strength to compressive strength plus tensile strength). However, strong correlations were found between the SE and the both brittleness B-5 (the product of percentage fines in the impact strength test and compressive strength) and brittleness B-8 (half of the product of compressive strength and tensile strength). The validations of the derived equations were also checked. It is concluded that the SE in ore cutting can be reliably estimated from the brittleness concepts B-5 and B-8.
Açıklama
Anahtar Kelimeler
Specific Energy, Ore Cutting, Brittleness Indexes, Regression Analysis
Kaynak
Journal of the Southern African Institute of Mining and Metallurgy
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
116
Sayı
8
Künye
Comakli, R., Kahraman, S., Balci, C., & Tumac, D. (2016). Estimating specific energy from the brittleness indexes in cutting metallic ores. Journal of the South African Institute of Mining & Metallurgy / SAIMM, (8), 763.
