Investigation of wetting behavior of coal-chars with liquid iron by sessile drop method
Journal Title: Carbon - Science and Technology - Year 2008, Vol 1, Issue 1
Abstract
Using the sessile drop approach, the wettability of four non-graphitic coal-chars with electrolytic iron and Fe-2%C-0.01%S alloy has been determined at 1550 °C, in a horizontal tube resistance furnace with an argon atmosphere. The ash concentration in chars ranged between 9.04 to 12.61 wt %, with alumina and silica as predominant ash components. The contact angles of these chars with liquid Fe-2%C-0.01%S alloy showed lesser variations with time as compared to corresponding angles with electrolytic iron. While the initial contact angles ranged between 106° and 137°, the contact angles for all coal-chars were quite similar after 60 minutes of contact (105 - 110°). While no well defined correlations could be observed between the initial char structure (Lc values) and ash concentration / composition and contact angles in the initial stages of contact, the contact angles over extended periods were significantly affected by the presence of reaction products and impurity deposits in the interfacial region. With coal-chars generally showing a non-wetting behavior with liquid iron, these results are discussed in terms of the transfer of carbon and sulphur by mass transport across the interface, the formation of an enriched interfacial layer containing calcium, sulphur and alumina, reduction of reducible oxides such as silica and iron oxides, and possible transfer of these elements into the liquid iron.
Authors and Affiliations
Rita Khanna, Fiona McCarthy, Veena Sahajwalla
Keywords
Related Articles
- EP ID EP45929
- DOI -
- Views 323
- Downloads 0
Effect of reinforcement of AL-6063 with SiC on mechanical behavior and microstructure of metal matrix composites
A phrase heard often in recent years, advanced composite materials like Al/SiC metal matrix composite is gradually becoming very important materials in auto and aerospace industries due to their superior properties. The...
Structural characterization of nano-sized Fe2O3-CeO2 catalyst by XRD, EDX and TEM techniques
Structural characteristics of nanosized iron-ceria mixed oxide catalysts have been investigated using X-ray diffraction (XRD), IR spectra, thermogravimetry, EDX and transmission electron microscopy (TEM). The investigate...
Mechanical behavior of chemically treated Jute/Polymer composites
Fiber which serves as a reinforcement in reinforced plastics may be synthetic or natural past studies show that only artificial fibers such as glass, carbon etc., have been used in fiber reinforced plastics. Although gla...
Nutrient recovery and energy efficient algal harvest from anaerobic digestor wastewater
The increasing levels of generation of wastewaters which are nutrient rich pose serious issues where conventional biological and chemical methods of treatment have failed in meeting sustainability challenges. In this stu...
Adsorption of Remazol Black B dye on activated carbon felt
The adsorption of Remazol Black B (anionic dye) on a microporous activated carbon felt is investigated from its aqueous solution. The surface chemistry of activated carbon is studied using X-ray microanalysis, "Boehm" t...