Yazar "Elchi, Obaidullah" seçeneğine göre listele

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    Investigation of the usage of waste materials and By-Products as grinding aids in calcite grinding
    (Pergamon-Elsevier Science Ltd, 2023) Cayirli, Serkan; Gokcen, Hasan Serkan; Yuce, Nuri; Elchi, Obaidullah
    Along with the increasing importance of water worldwide, it is thought that developments in fine grinding processes performed by dry grinding and using grinding aids are too essential to be ignored. Indeed, grinding chemicals in the form of pure or commercial mixtures are intensively used in mineral processing plants in dry grinding systems to micronized sizes, e.g., dry grinding of calcite to micronized sizes. This study investigated the usage of olive pomace oil (OPO) and olive waste water (OWW), waste/by-products of the olive oil industry, as grinding aids in the dry grinding of calcite to micronized sizes using a laboratory-scale stirred ball mill and compared them with pure and commercial grinding aids. The test results were evaluated in terms of product fineness, powder flowability, color factor, surface adsorption characteristics, and agglomeration behavior. The study revealed that using any of the grinding aids tested improved the grinding process in comparison with the no aid condition. It was understood from the experiments and analyses that using OPO and OWW as grinding aids positively affected grinding performance. Particularly, the particle size analyses showed that the product fineness obtained in dry grinding tests was close to that obtained with commercial and pure grinding aids. Considering all the investigated grinding aids (except for OWW), powder flowability increased with the increasing concentration of the grinding aid. Remarkably, the OWW results demonstrated that the increase in dosage was not beneficial in terms of the ffp index. However, the enhancement of particle size was obvious. When evaluated in terms of product quality, four types of grinding aids increased total color differences with respect to feeding material and no aid test. Furthermore, the Fourier transform infrared spectroscopy (FTIR) conducted to determine the interaction between particle surfaces and grinding aids indicated that the grinding aids used in this study were adsorbed on the calcite surfaces by their non-polar, polar functional group and hydroxyl group. The analysis, in which the agglomeration phenomenon was examined with SEM (scanning electron microscopy) images, revealed that using grinding aids reduced the formation of agglomerates in comparison with the no grinding aid condition.
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    PİRİNA YAĞININ ÖĞÜTME YARDIMCISI OLARAK KULLANABİLİRLİĞİNİN ARAŞTIRILMASI
    (2021) Çayırlı, Serkan; Gökçen, Hasan Serkan; Yüce, Nuri; Elchi, Obaidullah
    Bu çalışmada, kalsitin kuru mikronize boyutlara karıştırmalı bilyalı değirmende öğütülmesinde pirina yağının öğütme yardımcısı olarak kullanılabilirliği araştırılmıştır. Bu amaç doğrultusunda ilk aşamada farklı stres yoğunlukları oluşturularak optimum öğütme koşulları belirlenmiştir. İkinci aşamada ise pirina yağının kullanılabilirliği araştırılmış ve saf bir öğütme yardımcısı olan trietanolamin ile karşılaştırılmıştır. Deneysel sonuçlar öğütme yardımcısı miktarı, enerji tüketimi ve tane boyutu göz önünde bulundurularak değerlendirilmiştir. Elde edilen sonuçlara göre optimum stres yoğunluğu aralığı 500 kJ/kg ve 1000 kJ/kg enerji seviyelerinde yaklaşık 1-2*$10^{-3}$Nm olarak belirlenmiştir. 2000 kJ/kg enerji seviyesinde TEA ve pirina yağı kullanımı ile 4µm ve altı tane boyutuna sahip ürünler üretilebilmiştir. Pirina yağı kullanımı ile özellikle ileri enerji seviyelerinde (1000 kJ/kg ve 2000 kJ/kg) TEA’ya yakın tane boyutları elde edilmiştir.
  • Küçük Resim Yok
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    Utilization of wastes/by-products as grinding additives
    (Chamber of Mining Engineers of Turkey, 2023) Çayırlı, Serkan; Gökçen, Hasan Serkan; Yüce, Nuri; Elchi, Obaidullah
    In this work, the use of water (W) as a grinding additive in addition to waste/by-products such as olive black water (BW) and residue of olive black water (RBW) in calcite dry grinding to be sized in microns was investigated at a laboratory scale. The test results were evaluated in terms of particle size and powder flowability as a function of liquid material dosage and grinding time. The study revealed that the use of any kind of liquid materials tested improved the grinding process compared to the without-aid condition. Removing the water content (RBW) in BW resulted in further improvements in both particle size and powder flowability. The findings from both the BW and W data revealed that the dose increase does not yield favorable outcomes in relation to the ffp index. Nevertheless, there was a noticeable enhancement in particle fineness. © 2023 Union of Chambers of Engineers and Architects of Turkey. All rights reserved.