Evaluation of digital image processing (DIP) in analysis of magnetic separation fractions from Na-feldspar ore
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ORIGINAL PAPER
Evaluation of digital image processing (DIP) in analysis of magnetic separation fractions from Na-feldspar ore Ilgin Kursun 1 & Mert Terzi 1 & Orhan Ozdemir 1 Received: 10 January 2017 / Accepted: 15 August 2018 # Saudi Society for Geosciences 2018
Abstract Combination of flotation and magnetic separation methods is widely used for enrichment of feldspar ores by purifying from darkcolored gangue minerals such as iron and titanium. In this study, the removal of dark-colored minerals from feldspar ore (Aydin Cine region of Turkey) was studied using a dry magnetic separator. The effect of several parameters such as feed particle size, blade angle, and roll speed on the removal efficiency was investigated in detail. In addition, the gangue contents of the magnetic and non-magnetic products were determined by a digital image processing (DIP) method in terms of using color differences between the feldspar sample and gangue minerals. The results obtained from this study clearly indicated that the dry magnetic separation method can be successfully applied in enrichment of feldspar. Meanwhile, the particle size of the sample showed no significant influence on the separation recovery. According to the results obtained from the digital image processing process, the sample with 0.04% cross sectional area of dark-colored minerals can be obtained at roll speed of 100 rpm and 130° of blade angle using the original particle size of 500×106 μm. Additionally, most importantly, these results showed that digital image processing method can be used to determine gangue content (dark-colored minerals) of the magnetic separation products compared to conventional methods as a simple, a reliable, and a repeatable method. Keywords Feldspar . Magnetic separation . Digital image processing
Introduction Feldspars minerals, albite (NaAlSi3O8), orthoclase/microcline (KAlSi3O8), and anorthite (CaAlSi3O8), are used as a source of alumina in glass industry as they increase chemical stability and resistance of glass. In addition, feldspars are one of the most important materials in ceramic production, which causes a high viscosity and increasing the resistance to deformation of ceramic during baking (Bayraktar et al. 1997; Vidyadhar et al. 2002; Burat et al. 2007). Rutile and sphene are the main titanium oxide impurities, whereas garnet, hematite, hornblende, tourmaline, biotite, and muscovite are the main iron oxide impurities in feldspar ores. All of these impurities have coloring properties in ceramic and glass processing. Furthermore, the main goal in enrichment of feldspars is to remove the coloring minerals and to make a
* Orhan Ozdemir [email protected] 1
Faculty of Engineering, Department of Mining Engineering, Istanbul University, 34320 Istanbul, Turkey
product having titanium and iron contents less than 0.50% which is the required specification in ceramic and glass industries. Enrichment of feldspar can be realized with a series of operations such as flotation and magnetic separation. Conventional reverse flo
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