Distribution and Accumulation of Major and Trace Elements in Gypsum Samples from Lignite Combustion Power Plant  

作　　者：Majda Pavlin Radojko Jacimovic Andrej Stergarsek Peter Frkal Maja Koblar Milena Horvat 

机构地区：[1]Jozef Stefan International Postgraduate School,Ljubljana,Slovenia [2]Department of Environmental Sciences,Jozef Stefan Institute,Ljubljana,Slovenia [3]KEMEK d.o.o.,Ljubljana,Slovenia [4]Department of Inorganic Chemistry and Technology,Jozef Stefan Institute,Ljubljana,Slovenia [5]Center for Electron Microscopy and Microanalysis,Jozef Stefan Institute,Ljubljana,Slovenia

出　　处：《American Journal of Analytical Chemistry》2018年第12期602-621,共20页美国分析化学（英文）

基　　金：funded by the Slovenian Research Agency program P1-0143 and project L1-5446 and the young researchers program;supported by the EMPIR MercOx project(16ENV01).

摘　　要：Flue gas containing volatile elements, fine fly ash particulates not retained by particle control devices, and limestone are the most important sources of trace and major elements (TMEs) in wet flue gas desulphurization (WFGD) gypsum. In this study, samples of gypsum slurry were separated into fine and coarse fractions. Multi-elemental analysis of 45 elements in the different size fractions of gypsum, slurry waters and lignite were performed by k0-INAA (k0-instrumental neutron activation analyses). The study found that the volatile elements (Hg, Se and halogens) in the flue gas accumulate in the fine fractions of gypsum. Moreover, the concentrations of most TMEs are considerably higher in the fine fractions compared to the coarse fractions. The exceptions are Ca and Sr that primarily originate from the limestone. Variations of TMEs in the finer fractions are dependent on the presence of CaSO4·2H2O that is the main constituent of the coarse fraction. Consequently, the content of TMEs in the fine fraction is highly dependent on the efficiency of separating the fine fraction from the coarse fraction. Separation of the finer fraction, representing about 10% of the total gypsum, offers the possibility to remove effectively TMEs from WFGD slurry.Flue gas containing volatile elements, fine fly ash particulates not retained by particle control devices, and limestone are the most important sources of trace and major elements (TMEs) in wet flue gas desulphurization (WFGD) gypsum. In this study, samples of gypsum slurry were separated into fine and coarse fractions. Multi-elemental analysis of 45 elements in the different size fractions of gypsum, slurry waters and lignite were performed by k0-INAA (k0-instrumental neutron activation analyses). The study found that the volatile elements (Hg, Se and halogens) in the flue gas accumulate in the fine fractions of gypsum. Moreover, the concentrations of most TMEs are considerably higher in the fine fractions compared to the coarse fractions. The exceptions are Ca and Sr that primarily originate from the limestone. Variations of TMEs in the finer fractions are dependent on the presence of CaSO4·2H2O that is the main constituent of the coarse fraction. Consequently, the content of TMEs in the fine fraction is highly dependent on the efficiency of separating the fine fraction from the coarse fraction. Separation of the finer fraction, representing about 10% of the total gypsum, offers the possibility to remove effectively TMEs from WFGD slurry.

关 键 词：Trace and Major Elements Wet Flue Gas Desulphurization Gypsum Particle Size Fractions Mercury and Selenium Sample Preparation 

分 类 号：R73[医药卫生—肿瘤]