烧结过程中汞元素的热力学研究
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摘要
采用Factsage7.0热力学软件研究了烧结过程中痕量元素汞的形态及迁移转化规律。研究表明,在低温区汞以二价形态存在,在高温区99%的汞以单质形态存在。氯是影响汞氧化的主要元素,在含有氯元素时,800K以下汞主要以氯化汞的形式存在,850K左右是单质汞和二价汞的竞争区间,当温度高于900K时大部分汞又以单质作为稳定的存在形式。硫和氧元素对汞的氧化能力比氯弱,改变三者的含量都会使二价汞存在的温度区间发生变化。
Chemical thermal equilibrium analysis method was adopted to study morphology and distribution of trace elements of mercury in sintering process with Factsage 7.0.The results show that mercury exists in form of bivalence in low temperature region,and 99% of mercury exists in form of elementary substance in high temperature zone.Chlorine is the main effecting element on mercury oxidation.With existence of chlorine element,mercury exists in form of mercuric chloride under temperature of 800 K below,elementary substance and bivalence mercury compete at 850 K,while most of mercury exists in form of elementary substance under temperature of 900 Kabove.Compared with chlorine,sulfur and oxygen have weak oxidation capability on mercury.Change of content of Cl,S,and O will change the existing temperature interval of bivalence mercury.
Chemical thermal equilibrium analysis method was adopted to study morphology and distribution of trace elements of mercury in sintering process with Factsage 7.0.The results show that mercury exists in form of bivalence in low temperature region,and 99% of mercury exists in form of elementary substance in high temperature zone.Chlorine is the main effecting element on mercury oxidation.With existence of chlorine element,mercury exists in form of mercuric chloride under temperature of 800 K below,elementary substance and bivalence mercury compete at 850 K,while most of mercury exists in form of elementary substance under temperature of 900 Kabove.Compared with chlorine,sulfur and oxygen have weak oxidation capability on mercury.Change of content of Cl,S,and O will change the existing temperature interval of bivalence mercury.
引文
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[2]FU J X,TANG G H,ZHAO R J.Carbon reduction programs and key technologies in global steel industry[J].Journal of Iron and Steel Research,International,2014,21(3):275-281.
[3]SUN W Y,WANG Q Y,DING S L,et al.Reaction mechanism of NOxremoval from flue gas with pyrolusite slurry[J].Separation and Purification Technology,2013,118(30):576-582.
[4]ALMEIDA S M,LAGE J,FERNNDEZ B,et al.Chemical characterization of atmospheric particles and source apportionment in the vicinity of a steelmaking industry[J].Science of The Total Environment,2015,521-522(15):411-420.
[5]FUKUDA N,TAKAOKA M,DOUMOTO S,et al.Mercury emission and behavior in primary ferrous metal production[J].Atmospheric Environment,2011,45:3685-3691.
[6]PACYNA E G,PACYNA J M,SUNDSETH K,et al.Global emission of mercury to the atmosphere from anthropogenic sources in 2005and projections to 2020[J].Atmospheric Environment,2010,44(20):2487-2499.
[7]王泉海,邱建荣,吴昊.硫元素对烟气中汞的形态和分布的影响[J].燃烧科学与技术,2003,9(2):135-138.
[8]刘迎晖,郑楚光,游小清,等.氯元素对烟气中汞的形态分布的影响[J].环境科学学报,2001,21(1):72-73.