石灰石法与氨法脱硫产物中痕量元素对比  

Comparison of Trace Elements in Desulfurization Products by Limestone Method and Ammonia Method

作　　者：王铭玮 肖海平[1] 吴海涛 郭正旺 WANG Mingwei;XIAO Haiping;WU Haitao;GUO Zhengwang(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《动力工程学报》2024年第2期301-306,338,共7页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51706070)。

摘　　要：为实现脱硫产物资源化利用,评估硫酸铵和脱硫石膏的环境风险,分析了全厂重金属的含量,研究了石膏和硫酸铵中重金属的赋存和浸出特性。结果表明:Cu、Cr在硫酸铵中的含量均不足1%,远低于在石膏中的含量;Mn、Sn在石膏和硫酸铵中的含量相差6倍以上,可能是因为Mn、Sn离子的弱酸性;As、Pb含量在不同炉型的石膏中相差5倍以上,Se、Cd、Ba的分布规律不受炉型和脱硫工艺的影响;Cr的浸出质量浓度最高,约为标准限值的2.04%,Se与石膏中的Ca^(2+)生成CaSeO_(3)沉淀,Cu以CuFe_(2)O_(4)形式赋存于石膏中;硫酸铵中重金属的整体浸出水平高于脱硫石膏,但实验过程中重金属的排放和浸出质量浓度均远低于我国现行标准限值,脱硫产物资源化利用安全可行。In order to realize resource utilization of desulphurization products and assess environmental risks of ammonium sulfate and desulphurized gypsum,the content of heavy metals in the whole plant was analyzed,and the occurrence and leaching characteristics of heavy metals in the desulfurization products were studied.Results show that the content of Cu and Cr in ammonium sulfate is less than 1%,much lower than that in gypsum.The content of Mn and Sn in gypsum and ammonium sulfate differs by more than 6 times,probably due to the weak acidity of Mn and Sn ions.The content of As and Pb in gypsum produced by different furnace types can be as high difference as 5 times,while the distribution of Se,Cd and Ba is not affected by the furnace type and desulfurization technology.The leaching concentration of Cr is maximum,about 2.04%of the standard limit.Se with Ca^(2+) and Cu are deposited in desulfurization gypsum in the form of CaSeO_(3) precipitate and CuFe_(2)O_(4),respectively.The leaching level of heavy metals in ammonium sulfate is higher than that in desulfurization gypsum,but the emission and leaching concentration of heavy metals in the tests are far lower than the current standard limits,so the resource utilization of desulphurization products is safe and feasible.

关 键 词：脱硫石膏 硫酸铵 痕量元素 环境评估 

分 类 号：X708[环境科学与工程—环境工程]