Sürdürülebilir Kalkınma Amaçları
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- MakaleAçık Erişim2023Combination of Conventional Ball Mill and Stirred Mill to Obtain Ultra-Fine Talc
Uçurum, Metin; Güleç, Ömer; Toraman, Oner Yusuf
In this study, it was investigated that talc ore could ground to very fine sizes using a combination of conventional ball mill and vertical stirred mill. Firstly, the conventional ball mill parameters such as mill speed (% of critical speed), material filling ratio (Jb), ball filling ratio (fc), ball size distribution (10-20-30-40 mm, %), grinding aid ratio (% of powder) and grinding time (min.) were optimized using classic experimental design. As a result of the optimization, fine talc product was obtained with d90=93.52 µm particle size. In the second stage, the ball mill product was re-milled using a stirred mill. As a result of study, a final ultra-fine talc powder was obtained after 60 minutes grinding time with d50=1.85 µm particle size and 14058 cm2/g total surface area. It has been seen that the conventional ball mill+stirred mill combination effective a process to obtain talc powder that suitable for industrial use.
- MakaleYalnız künye2017Stearik Asit Çeşidinin Kalsit Kaplama Verimi Üzerine Etkisi
Uçurum, Metin; Malgir, Eda
Stearik asit, CH3(CH2)16COOH formülüyle gösterilen doymuş bir yağ asididir. Birçok sanayi dalında kullanılan granül formdaki stearik asit, mikronize kalsit ürünlerinin kaplanmasında da geniş olarak kullanılmaktadır. Piyasada farklı kodlarla satılan stearik asitlerin kalsit kaplamadaki verimlerinin araştırıldığı bu çalışmada, kaplama işlemi dik karıştırmalı bilyeli değirmen kullanılarak gerçekleştirilmiştir. Beş farklı stearik asitle (C1865, C1852, C1843, C1839 ve C1837) kaplanan kalsit ürünleri önemli kalite göstergeleri olan aktive oranı, kaplama oranı, renk parametreleri (L*, a*, b*) ve tap yoğunluk değerleri açısından karşılaştırılmıştır. Kaplama için en uygun stearik asit tipinin ise C1865 olduğu tespit edilmiştir
AtıfTR Dizin3
İncele - MakaleYalnız künye2017Using Patent Analysis to Construct Technology Networks
Yilmaz, Mustafa Kemal; Altuntaş, Fatma
The creation of technology networks is quite important with respect to the development of technologies. In this study, technology network is drawn based on patent documents. Unmanned vessel technologies (UVTs) are examined by the use of patent analysis. All patent documents are retrieved from the USPTO (The United States Patent and Trademark Office), which is extensively used for patent research in the literature. S-curve is drawn to determine the current technology stage. It is concluded that the UVT is at the growth stage of its technology life cycle. Therefore, it is an acceptable technology for investment. Simple linear regression analysis is then performed in this study to find the answer to the question of which sub-technology related to UVTs should be selected for investment? The relations among the IPC (International Patent Classification) codes for the UVTs are found through the simple linear regression analysis. A social network analysis software, namely Gephi, is also used to draw technology network for the UVTs as well as strategic technology code networks for the IPC codes. The results of this study show that the UVTs is an emerging technology and can be invested in the future
AtıfTR Dizin4İncele