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Öğe Predicting the crushability of rocks from the impact strength index(PERGAMON-ELSEVIER SCIENCE LTD, 2010) Toraman, O. Y.; Kahraman, S.; Cayirli, S.To investigate the possibility of predicting the crushability of rocks from impact strength index, twenty-four different rock types were tested in the laboratory. The crushability results were correlated with the results of impact strength test and regression analysis was performed. A strong inverse linear relation between the crushability index and the impact strength index was found. The effect of porosity and density on the correlation was also shown. In addition, multiple regression analysis including porosity and density was carried out. The significances of the derived models were statistically tested. It was concluded that the crushability of rocks can practically be estimated from the impact strength index using the simple regression model. (C) 2010 Elsevier Ltd. All rights reserved.Öğe Predicting the strength and brittleness of rocks from a crushability index(SPRINGER HEIDELBERG, 2018) Kahraman, S.; Toraman, O. Y.; Cayirli, S.Uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), and brittleness are widely used in rock engineering applications. However, preparing the test samples for the standard tests may not always be possible for weak or soft rocks. On the other hand, only rock fragments may be available to estimate the rock strength in some cases such as drilling. Therefore, developing some models for estimating the rock strength and brittleness from rock fragments will be useful. In this study, a crushability index (CI) was described from the crushing test, and the possibility of predicting UCS, BTS, and brittleness from this index was investigated. Strong and significant linear correlations were found between the CI and UCS, BTS, and one of the brittleness concepts. It was concluded that the UCS, BTS, and some brittleness concepts of rock could be estimated from the CI. The suggested method is especially useful for the drilling industry and for the cases where there are not enough samples for the standard tests. However, the study is a preliminary study on limited rock types and further study is required by including the number of different rock types.Öğe The effect of stirrer design in different stirred mill orientations(Baski, 2019) Cayirli, S.; Gokcen, H.S.; Yüce, N.This study focuses on investigating the effects of stirrer design in different mill orientations on calcite grinding performance of a dry stirred mill. Within the scope, series of batch grinding tests were undertaken with laboratory scale vertically/horizontally orientable stirred mill and four different stirrer designs (3-pin, 5-pin, 3-disc, and 5-disc) having the same diameter. Experimental results were evaluated based on the stress energy analysis. It is shown that comminution behaviors of different stirrer designs and mill orientations can be explained by the stress energy model. Over energy input 750 kJ/kg d50 of the product is reduced by replacing stirrer designs. Copyright © IMCET 2019 International Mining Congress and Exhibition of Turkey. All rights reserved.Öğe The impact of different stirrer designs and mill orientations on the grinding efficiency(Elsevier, 2024) Cayirli, S.; Gokcen, H. S.; Yuce, N.The primary objective of this research is to examine the impact of various stirrer designs in different mill orientations on the efficiency of calcite grinding in a dry stirred mill. In the context of the research, a series of batch grinding experiments were performed using a laboratory -scale stirred mill that could be oriented vertically or horizontally. Four distinct stirrer designs, namely 3 -pin, 5 -pin, 3 -disc, and 5 -disc, all with the same diameters, were employed in these studies. Stress intensity analysis was used to evaluate the experimental outcomes. The findings indicated that the number of stirrers present on the shaft, whether in the form of pins or discs, significantly influenced the effectiveness of the grinding process. Furthermore, the horizontal orientation performance of the 5 -disc design provided the best particle fineness compared to other combinations. Additionally, the batch grinding experiments provided indications that the disc design yielded favorable results when employed in the horizontal mill configuration, while the pin design proved to be successful when utilized in the vertical mill configuration. Aside from these, design variations had an impact on the particle size distribution width characteristics of the products. The design parameters were also evaluated in terms of the stress intensity -particle size distribution width relationship.
