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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Estimating specific energy from the brittleness indexes in cutting metallic ores
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Estimating specific energy from the brittleness indexes in cutting metallic ores

机译：从切削金属矿石的脆性指数估算比能

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摘要

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.
机译：比能量（SE）是评估机器岩石开挖的非常有用的参数。从脆性预测SE是可行的，特别是对于初步研究而言，因为从切削试验中确定SE既困难又昂贵。在这项研究中，对金属矿石（例如铬铁矿，赤铁矿，方铅矿和铁矾）的不同脆性概念对SE的可预测性进行了研究。在实验室中进行了单轴抗压强度，巴西拉伸强度，冲击强度和小尺寸切削试验。 SE值是通过切削试验计算得出的，并与三种不同的脆性概念相关联。在SE和脆性B_3之间（抗压强度减去抗拉强度与抗压强度再加上抗拉强度之比）之间没有发现显着的相关性。但是，在SE与脆性B_5（冲击强度试验中的细粉百分率和抗压强度的乘积）和脆性B_8（抗压强度和拉伸强度的乘积的一半）之间都发现了很强的相关性。还检查了推导方程的有效性。结论是，可以从脆性概念B_5和B_8可靠地估计矿石切削中的SE。

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