烧结脱硫灰资源化利用途径

RESOURCE UTILIZATION PATH OF SINTERED DESULFURIZATION ASH

钢铁行业烟气脱硫呈向好之势,与此对应的烧结脱硫灰逐期增长量及累积堆存量逐年增加,开展烧结脱硫灰资源化利用途径理论和技术研究成为亟待解决的问题。但烧结脱硫灰成分构成不稳定、性质不稳定、含有的重金属可形成二次污染、氯离子含量过高等问题,限制了其大规模工业化应用。本文介绍了烧结脱硫灰的理化特性,分析了影响烧结脱硫灰利用的主要因素,并对目前国内外对烧结脱硫灰资源化利用途径的主要研究方向进行了剖析。制备水泥缓凝剂、氧化研究、酸性土壤改良、矿渣微粉添加剂、加气混凝土砌块、填充材料等是目前烧结脱硫灰的主要资源化利用领域,未来还应在生态凝胶、火山灰水泥掺料、水泥生产助磨剂、生态型水泥、沥青混合料、蒸压砖、制备硫酸钙晶须等方面进行深入探索,以拓宽烧结脱硫灰的资源化利用途径。

The flue gas desulfurization of the iron and steel industry is showing a good trend,and the corresponding sintered desulfurization ash increases periodically and the cumulative stock increase year by year,and the theoretical and technical research on the resource utilization path of sintered desulfurization ash has become an urgent problem to be solved.However,the composition of sintered desulfurization ash is unstable,the properties are unstable,the heavy metals contained in it can form secondary pollution,and the chloride ion content is too high,which limits its large-scale industrial application.In this paper,the physical and chemical characteristics of sintered desulfurization ash are introduced,the main factors affecting the utilization of sintered desulfurization ash are analyzed,and the main research directions of sintered desulfurization ash resource utilization at home and abroad are analyzed.The preparation of cement retarder,oxidation research,acid soil improvement,slag powder additives,aerated concrete blocks,filling materials,etc,are the main resource utilization areas of sintered desulfurization ash at present,and in the future,in-depth exploration should be carried out in ecological gel,pozzolana cement admixture,cement production grinding aid,ecological cement,asphalt mixture,autoclaved brick,preparation of calcium sulfate whisker,etc.,in order to broaden the resource utilization of sintered desulfurization ash.