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muyaqin(金币+5, 翻译EPI+1): 2010-11-15 16:47:15
Desulfurization ash is by-products produced by flue gas desulfurization in coal-firing and metallurgical industries.Arbitrarily stacked desulfurization ash can occupy much of the land , cause serious secondary pollution, and bring great economic burden for companies.By adopting grinding thin coal as fuel ,modern boilers produce huge fly ash emissions,which not only greatly endanger our living environment but also enormously constrain the Sustainable development of national economy.Considering our country is in short of sulphur and bauxite resources,in this paper desulphurization ash and fly ash are used to produce Sulfuric acid and alumina,which not only improved the people's living environment, but also recycle useful resource to satisfy industrialization demand, alleviate resource shortage, and reach reutilization purpose.
This paper is focused on  1) Physical and chemical characteristics,mineral composition and microstructure of the desulfurization ash were studied with methods of XRD、DSC、SEM、EDS etc. (2) The process of producing sulfuric acid and alumina from desulfurization ash and fly ash respectively is studied on the basis of thermodynamics analysis, and the possibility,order,equilibrium condition and final products of the chemical reactions were all studied in this paper.(3) In addition to the mixing amounts of coke and fly ash ,the calcination temperature on the ecomposition of CaSO4 and the leaching of aluminium is also investigated in this paper.(4) The optimum reaction conditions were determined in the end. |
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