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Preparation of valuable products from cleaned carbon of fuel ash

1 Chemical and electrochemical lab., Mineral Processing Dept. Central Metallurgical Research and Development Institute, P.O.Box 87, Helwan Cairo, Egypt
2 Department of Chemistry, Faculty of Science, Cairo University, Egypt
3 Nuclear materials Authority, El Malady Cairo, Egypt

Topical Section: Carbon Materials

This work provides a method to use waste carbon of fuel ash left after steam generation in power stations in Egypt to prepare valuable products such as activated carbon and alumina-dolomite-carbon bricks. Carbon content in ash as received amounts to 41.22%, S to 7.2% and others to 11.36% compared to 80%, 4.2% and 2.55% after cleaning respectively. Impurities (21 wt%) in carbon were decreased to 4.78% by sulphuric acid leaching, and carbon content in ash amounts to 95.22%, S to 4.35% and others to 0.36%. Activated carbon (AC) with surface area of 1050 m2/g was prepared by steam gasification at ≤800 °C in presence of zinc chloride. The activation process has ∆E value of 82.6 kJ/mol. The AC quality was tested by adsorption of hexa-valent Cr6+ from waste tannery solution. It adsorbed 124 mg Cr6+/g C equivalent to 94% of the present Cr6+. Alumina-dolomite-carbon bricks were made by hot mixing Al2O3, dolomite, C with coal tar pitch. The green bricks were baked at 1000 °C, multi-impregnated with molten coal tar pitch followed by charring at 750 °C to seal the porous system of the fired bricks.The prepared brick samples have high density value, good thermal and chemical stability, an outstanding resistance against hydration (>60 days). Brick body is a heterogeneous composite of dolomite and carbon particles that possess different physico-chemical properties.
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Copyright Info: © 2017, Mahmoud A. Rabah, et al., licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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