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Preparation of valuable products from cleaned carbon of fuel ash

  • Received: 16 July 2017 Accepted: 11 September 2017 Published: 13 November 2017
  • 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.

    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[J]. AIMS Materials Science, 2017, 4(5): 1186-1201. doi: 10.3934/matersci.2017.5.1186

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  • 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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