镁渣晶体结构对脱硫活性影响实验

Effect of crystal structure on the desulfurization reactivity of magnesium slag

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Ca^2+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%。

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 Ca^2+ 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%.