Alumina Extraction from Alumina Rich Fly Ash Generated from Inner-Mongolia Chinese Coal

Abstract:

Generated during the combustion of coal for electricity production, fly ash is a solid waste and causes great ecomomic burden and serious environmental pollution. On the other hand, it is a good resource for the preparation of industrial products. Especially, alumina rich fly ash from Inner-Mongolia Guohua Junggar Power Plant typically contains 45-55% alumina, 30-40% silica, and 5-10% other metallic oxides, it is a perfect resource for alumina extraction. In order to improve the utilization value of alumina rich fly ash and lessen environmental strain, a novel approach for alumina extraction from alumina rich fly ash was proposed. The proposed process includes a pre-desilication process, soda lime sintering process, dissolving process, carbonation process and calcination process. The technological conditions for alumina extraction from Junggar alumina rich fly ash were optimized by means of orthogonal experment design. The extraction rate of alumina was 96%. Value-added products, such as electrolytic grade alumina and white carbon black, were produced at the same time.

• Periodical: Advanced Materials Research (Volumes 1065-1069)
• Pages: 1725-1731
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1065-1069.1725
• Online since: December 2014
• Authors: Xiao Ting Liu*, Bao Dong Wang, Yong Feng Xiao, Xiao Huan Wang, Li Jun Zhao, Geng Zhi Yu, Qi Sun
• Keywords: Alumina, Extraction, Fly Ash, Pre-Desilicate, Sinter

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