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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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Keywords fuel ash; active carbon; alumina-dolomite-carbon bricks; steam gasification

Citation: Mahmoud A. Rabah, Mohamed B. El Anadolly, Rabab A. El Shereif, Mohamed Sh. Atrees, Hayat M. El Agamy. Preparation of valuable products from cleaned carbon of fuel ash. AIMS Materials Science, 2017, 4(5): 1186-1201. doi: 10.3934/matersci.2017.5.1186

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