Leaching of aluminum and iron from boiler slag generated from a typical Chinese Steel Plant
文献类型： 外文期刊
作者： Li, Jinping 1 ; Gan, Jinhua 2 ; Li, Xianwang 3 ;
作者机构： 1.Wuhan Univ Sci & Engn, Sch Environm & Urban Construct, Wuhan 430073, Peoples R China
2.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Jinzhou, Peoples R China
3.Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China
关键词： boiler slag;sintering;extraction efficiency;leaching
期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）
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收录情况： SCI
摘要： This paper presents a new way of recycling aluminum and iron in boiler slag derived from coal combustion plants, which integrates efficient extraction and reuse of the leached pellets together. The boiler slag was pelletised together with washed coal and lime prior to sintering and then was sintered at 800-1200℃ for different periods to produce sintered pellets for the leaching test. An elemental analysis of aqueous solutions leached by sulfuric acid was determined by EDTA-Na2-ZnCl2 titration method. The components and microstructures of the samples, sintered pellets and leached residue were examined by means of XRF, XRD and SEM. XRD analysis indicates that predominate minerals such as kaolinite, quartz, calcium silicide, hematate and metakoalin exist in the boiler slag. An aluminum extraction efficiency of 86.50% was achieved. The maximum extraction efficiency of Fe was 94.60% in the same conditions of that for the maximum extraction efficiency of Al. The extraction efficiencies of Al and Fe increased with an increase in temperature, leaching time and acidity. High Al extraction efficiency was obtained for pellets with high CaO content. The final product of alumina would be used directly for the production of metallic aluminum.
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