Study on Multi-form Coal Impact Breakage Using Shi's Breakage Model

摘要

The Shi's breakage model was introduced to describe the relationship of breakage index, t_(10), to the particle size and impact energy. To validate the application of this model in coal impact breakage, three types of impact breakage tests including drop weight test, rotary breakage test and bed breakage were conducted, which represent single particle binary side impact breakage, single particle single side impact breakage and particle batch impact breakage respectively. The results show that Shi's breakage model fits the coal impact breakage well with the average R~2 of above 0.95. For single particle, one side impact was found to be more efficient than binary side impact. For batch breakage, the sample with higher ash content was more liable to be broken due to ash grinding aid effect. The maximum t_(10) of coal impact breakage was subject to the breakage pattern in a large degree. In this paper, the mean maximum t_(10) of above three kinds of tests are 67.6%, 76.1% and, 43.7% respectively.