Thermodynamic Analysis in Sintering Reaction of Coal Fly Ash with Alkali

Abstract:

With sodium carbonate and calcium oxide as sintering additives, through the thermodynamic analysis and sintering experiment, study the thermodynamic behavior of fly ash with both in the sintering process; the sintering products were analyzed by XRD. The research results show that sodium carbonate as sintering additive fly ash thermal decomposition of the main phase of nepheline (NaAlSiO₄), calcium oxide as sintering additives, and fly ash sintered products mainly 12CaO·7Al₂O₃、2CaO·Al₂O₃·SiO₂ and 2CaO·SiO₂ etc., And the temperature of the above substances generated is very favorable, fly ash and calcium oxide sintered at high temperature. Through sintering can effectively decompose the fly ash of quartz and mullite, soluble in acid or alkali salts, lay the foundation for the extraction of aluminum and silicon material from fly ash.

• Periodical: Materials Science Forum (Volumes 809-810)
• Pages: 895-900
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.809-810.895
• Online since: December 2014
• Authors: Si Qiong Li, Jie Chen*
• Keywords: Calcium Oxide, Coal Fly Ash, Sintering, Sodium Carbonate, Thermodynamic

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DOI: 10.1007/978-3-319-48179-1_38

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