化工进展 ›› 2019, Vol. 38 ›› Issue (07): 3319-3325.DOI: 10.16085/j.issn.1000-6613.2018-1903

• 材料科学与技术 • 上一篇    下一篇

镁渣晶体结构对脱硫活性影响实验

韩飞(),贾里,乔晓磊,金燕,樊保国()   

  1. 太原理工大学电气与动力工程学院,山西 太原 030024
  • 收稿日期:2018-09-20 出版日期:2019-07-05 发布日期:2019-07-05
  • 通讯作者: 樊保国
  • 作者简介:韩飞(1994—),男,硕士研究生,研究方向为燃烧污染物控制。E-mail:<email>959985801@qq.com</email>。
  • 基金资助:
    国家自然科学基金(51476109)

Effect of crystal structure on the desulfurization reactivity ofmagnesium slag

Fei HAN(),Li JIA,Xiaolei QIAO,Yan JIN,Baoguo FAN()   

  1. College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
  • Received:2018-09-20 Online:2019-07-05 Published:2019-07-05
  • Contact: Baoguo FAN

摘要:

研究了激冷水合过程中镁渣晶体结构的变化,结合钙转化率研究了晶体结构对镁渣脱硫活性的影响。借助X射线衍射和透射电镜分析了镁渣的晶体结构和形貌特征。结果表明:β-C2S中的Ca2+配位不规则是其水合活性高于γ-C2S的原因。随着镁渣激冷温度升高,β-C2S增加,促进了具有发达孔隙结构的C-S-H生成,提高了物理吸附能力;晶粒细化程度增大,晶胞参数变化引起的晶格缺陷增多,增强了化学吸附能力。950℃激冷温度下镁渣脱硫活性最高,钙转化率达到24.6%。

关键词: 镁渣, 水合物, 硅酸二钙(Ca2SiO4), 晶体结构, 吸附, 活性

Abstract:

The change of crystal structure of magnesium slag during chilling hydration and its effect on the desulfurization activity were studied. The crystal structure and morphology were identified by XRD and TEM. The results showed that the irregular Ca2+ coordination in β-C2S caused the hydration activity higher than that of γ-C2S. As the chilling temperature increased, the content of β-C2S and the degree of grain refinement increased. The former promoted the generation of C—S—H with developed pore structure, enhancing the physical adsorption capacity, and the latter caused more lattice defects, enhancing the chemical adsorption capacity. The desulfurization performance of magnesium slag was the highest at 950℃, and the calcium conversion rate reached 24.6%.

Key words: magnesium slag, hydrate, calcium sillicate, crystal structure, adsorption, reactivity

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