为了解决钢铁企业烧结烟气脱硫石膏资源化再利用问题,将其应用于盐碱土壤的改良中.通过对两家钢铁企业的不同烧结烟气脱硫工艺的脱硫副产物进行成分及重金属、二噁英含量的分析,探讨其改良盐碱土壤的可行性.分析表明,烧结烟气湿法脱硫石膏可应用于改造盐碱土壤,而干法脱硫石膏不适宜.通过土柱淋溶试验,模拟不同施用量及淋溶次数对盐碱土壤pH值、盐分及钠吸附比SAR等理化参数的影响,验证了烧结烟气湿法脱硫石膏改造盐碱土壤的可行性,为实际应用提供理论依据.
In order to solve the resource utilization of sintering flue gas desulfurization gypsum in steel companies,the gypsum was applied to amend saline-sodic soils. In this paper the composition and content of heavy metals and dioxin of desulphurization byproducts from different sintering flue gas desulfurization processes were studied to explore the possibil-ity of soil transformation. The analysis indicated that the wet-type desulphurization gypsum of sintering flue gas can be ap-plied to saline-sodic soils amelioration,not as the dry-type desulphurization gypsum. Then the effects of application amount and leaching times on pH,salinity and sodium adsorption ratio of saline-sodic soils were evaluated in soil-column experiment. The experiments validated the feasibility of saline-sodic soils amelioration with sintering flue gas desulfuriza-tion gypsum and provided a theoretical basis for practical application.
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