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Öğe Investigation into the influence of microwave pre-treatment on coal crushability using various strength tests(TMMOB Maden Muhendisleri Odasi, 2017) Toraman, O.Y.; Delibalta, M.S.In the present study, the effect of microwave energy on crushability of high ash low rank Turkish coal has been investigated. Coal samples were treated by microwave at a frequency of 2.45 GHz with 0.80 kW power level and different exposure times (15-240 s). In order to determine the crushing resistance of lignite coal samples treated by microwave oven, the various strength tests (ISI, CI, Is(50)) were applied for each treated and untreated sample and compared with each other. Experimental results have shown that significant increases in crushability were achieved when the coal samples were exposed to microwave radiation.Öğe Mechano-activated surface modification by stirred milling with metallic soaps and fatty acid(TMMOB Maden Muhendisleri Odasi, 2017) Toraman, O.Y.; Kose, H.; Bitirmis, B.This paper investigates the surface modification of calcite (CaCO3) from the Ni?de region of Turkey with sodium oleate (SO), sodium stearate (SDS) and stearic acid (SA) complex as modification agents, which are incorporated into the calcite with dry ultra-fine grinding in a laboratory stirred mill (750 ml). The effect of surface modification is evaluated by a floating test, which is characterized by the active ratio, colour properties and oil absorption. The results indicate that the hydrophilic surface of calcite becomes hydrophobic after the incorporation of SO, SDS and SA by dry stirred milling.Öğe Predicting the brittleness of rocks from a crushability index(European Association of Geoscientists and Engineers, EAGE, 2015) Kahraman, S.; Toraman, O.Y.The determination of brittleness, an important mechanical property of rocks, requires some standard tests which are time consuming and expensive. The sample preparation and testing methods are easy in the crushability test suggested in this study and a small amount of crushed rock is enough for testing. That the crushability test can be applied on the drill cuttings is another important advantage. The prediction of brittleness from the crushability test will be useful for some cases. 500 g oven-dried crushed samples, in the size range of 19.0-9.52 mm, were prepared from twenty four different rock types. After charging the samples to a jaw crusher, the crushed materials were passed through the 9.52 mm mesh and the percentage of oversized material was described as the crushability index (CI). The brittleness B1 determined from the Protodyakonov impact test and the brittleness B2 determined from compressive and tensile strength were evaluated in this study. A significant strong correlation was found between the CI and the brittleness B2. Because the tested rocks cover sedimentary, igneous, and metamorphic rocks, the derived relation can be generalized. It can be concluded that the crushability test is a practical and easy method for the prediction of brittleness B2.Öğe Wet fine grinding in a laboratory stirred ball mill(2010) Toraman, O.Y.; Katircioglu, D.Fine grinding involves a large number of parameters in its operation. In this study, the effect of some parameters such as initial particle size, filling volume of the ball and ball size distribution on fine grinding of calcite powders (-200, -150 and -100 ?m) using a laboratory stirred ball mill was studied under wet conditions. Zirconia beads (ZrSiO4) were used as grinding media with 1.0-1.2, 2.0-2.2 and 2.8-3.0 mm. A series of batch experiments using 23 full factorial designs was conducted to determine optimum grinding parameters. The main and interaction effects on specific surface area (m2.g-1) in fine grinding were evaluated using Yates' analysis. The test results showed that the ball filling ratio is the most important effect.
