Yazar "Cayirli S." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    A correlative study on textural properties and crushability of rocks
    (Springer Verlag, 2019) Comakli R.; Cayirli S.
    Rock texture is a term representing the mineral grains, grain sizes, and matrices of rocks. Crushability properties of rocks are very important parameters on an industrial scale and they can be determined by different methods. This study investigated the effects of textural properties of rocks on their crushability. For this purpose, some physical and mechanical tests were carried out on 12 different rock samples, which were divided into igneous, metamorphic, and sedimentary rock groups. All rock samples were crushed by using jaw and roll crushers, and crushability indices (CI) and particle sizes (d50, d80) were determined for all rock samples. The textural properties of rocks were defined by using the texture coefficient (TC) approach on thin section images. The test results were statistically analyzed, and firstly the physical and mechanical properties were correlated with CI and TC, respectively. Positive linear correlations were found between TC and uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), and Schmidt hammer hardness (SHH). When the rock samples were grouped based on their geological origins, there were strong or good linear relationships between CI and UCS and BTS for both the jaw and roll crushers. Then, TC was correlated with CI, d50, and d80. It was found that TC was influential on CI especially for the roll crusher. However, when the rocks were separated as igneous, metamorphic and sedimentary, strong linear relationships were found for both crushers. The same was observed for the relationship between TC and both d50 and d80; the correlation coefficients were higher and more reliable for the roll crusher than the jaw crusher. The results of this study showed that the textural properties of rocks are more influential on the results obtained in a roll crusher than a jaw crusher. However, more rock samples are required to verify the results of this study. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
  • Küçük Resim Yok
    Öğe
    Influences of operating parameters on dry ball mill performance
    (Oficyna Wydawnicza Politechniki Wroclawskiej, 2018) Cayirli S.
    The paper is aimed to investigate the influence of operating parameters on dry fine grinding of calcite in a laboratory scale conventional ball mill. Within the context, the influence of operating parameters such as mill speed, ball filling ratio, ball size distribution, powder filling ratio, grinding aid dosage and grinding time were studied. The results of grinding tests were evaluated based on the product particle size (d50, d80) and surface area (m2/kg). As a result of this study, optimum grinding test conditions determined to be 70% of Nc, J=0.35 for ball filling ratio, 40 mm (10%), 32 mm (10%), 20 mm (40%), 12 mm (40%) for ball size distribution, fc=0.125 for powder filling ratio, 2000 g/Mg for grinding aid dosage and 60 min for grinding time. After determining optimum grinding conditions, the influence of grinding aid dosage on powder fluidity was determined. The use of 2000 g/Mg grinding aid dosage had a greater fluidizing effect compared to the other dosages and no aid condition (0 g/Mg). The influence of grinding aid on dry fine grinding of calcite was also examined by Fourier Transform Infrared Spectroscopy (FTIR). FTIR measurements indicated that grinding aid was adsorbed on the ground calcite particles surface. © Wroclaw University of Science and Technology.