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首页> 外文期刊>Fuel >Retarding effect of impurities on the transformation kinetics of FGD gypsum to alpha-calcium sulfate hemihydrate under atmospheric and hydrothermal conditions
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Retarding effect of impurities on the transformation kinetics of FGD gypsum to alpha-calcium sulfate hemihydrate under atmospheric and hydrothermal conditions

机译：大气和水热条件下杂质对烟气脱硫石膏向α-硫酸钙半水合物转化动力学的抑制作用

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摘要

The influence of impurities in FGD gypsum (>90% CaSO4 center dot 2H(2)O) on the kinetics of its transformation to alpha-calcium sulfate hemihydrate (alpha-HH, CaSO4 center dot 0.5H(2)O) has been seldom investigated. This work demonstrates that CaCO3 and CaSO3 in FGD gypsum retard the transformation kinetics under hydrothermal conditions at atmospheric pressure, while SiO2 produces little effect. The induction time elapsed to initiate the transformation is significantly prolonged mainly because of CaSO3, which origins from its ability to decrease the driving force and simultaneously block a-HH nucleation sites on gypsum crystals. Transformation of FGD gypsum to a-HH can be significantly boosted by washing away the CaSO3. Enlarging the driving force via regulating temperature, salt solution concentration and acidity can also accelerate the transformation. The results indicate FGD process optimization, especially by a complete oxidation of CaSO3, would advance the utilization of FGD gypsum for a-HH production. (C) 2017 Elsevier Ltd. All rights reserved.
机译：烟气脱硫石膏中的杂质（> 90％CaSO4中心点2H（2）O）对其转化为α-硫酸钙半水合物（α-HH，CaSO4中心点0.5H（2）O）的动力学的影响很少调查。这项工作表明，FGD石膏中的CaCO3和CaSO3会在大气压下的水热条件下阻碍转化动力学，而SiO2的作用很小。主要由于CaSO3的原因，开始引发转化的诱导时间显着延长，这是由于CaSO3降低了驱动力并同时阻断了石膏晶体上的a-HH成核位点。洗掉CaSO3可以大大促进FGD石膏向a-HH的转化。通过调节温度，盐溶液浓度和酸度来增加驱动力也可以加速转化。结果表明，烟气脱硫工艺的优化，特别是CaSO3的完全氧化，将促进烟气脱硫石膏在α-HH生产中的利用。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第1期|445-451|共7页
  • 作者

    Fu Hailu; Huang Jianshi; Yin Linwan; Yu Jie; Lou Wenbin; Jiang Guangming;

  • 作者单位

    China Jiliang Univ, Coll Qual & Safety Engn, Hangzhou 310018, Zhejiang, Peoples R China;

    China Jiliang Univ, Coll Qual & Safety Engn, Hangzhou 310018, Zhejiang, Peoples R China;

    China Jiliang Univ, Coll Qual & Safety Engn, Hangzhou 310018, Zhejiang, Peoples R China;

    Ningbo Univ, Fac Architectural Civil Engn & Environm, Ningbo 315211, Zhejiang, Peoples R China;

    Ningbo Univ Technol, Sch Mat & Chem Engn, Ningbo 315021, Zhejiang, Peoples R China;

    Chongqing Technol & Business Univ, Minist Educ, Engn Res Ctr Waste Oil Recovery Technol & Equipme, Chongqing 400067, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    FGD gypsum; alpha-Calcium sulfate hemihydrate; Impurities; CaSO3; Transformation kinetics;

    机译：脱硫石膏;α-半水合硫酸钙;杂质;CaSO3;转化动力学;

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