低浓度软锰矿浆烟气脱硫过程中的催化作用

Catalysis in the process of flue gas desulphurization by low concentration pyrolusite slurry

通过对SO42-浓度的分析,研究了低浓度软锰矿浆烟气脱硫过程中的液相和固相催化作用。研究表明:低浓度软锰矿浆中Fe(Ⅱ,Ⅲ)的浸出率很低(<7%),致使Fe(Ⅱ,Ⅲ)离子的液相催化作用和Mn(Ⅱ)、Fe(Ⅱ,Ⅲ)离子间的液相协同作用不明显。该过程中实际生成的SO24-主要来自3个方面:MnO2的直接氧化还原作用,Mn(Ⅱ)的液相催化作用以及软锰矿固相组分的催化作用。其中,Mn(Ⅱ)的液相催化作用始终占据主导地位;MnO2的直接氧化还原作用与固相催化作用相比,在20 min前有明显的优势,而20 min后则几乎可以忽略不计。

The liquid and solid phase catalysis was studied in the process of flue gas desulphurization by low concentration pyrolusite slurry based on the concentration analysis of SO4^2- The result shows that the liquid phase catalysis of Fe（ Ⅱ ,Ⅲ ） and the liquid phase synergetic reaction between Mn（Ⅱ） and Fe（ Ⅱ ,Ⅲ ） are not obvious due to the low lixivlating rate of the Fe redox by Mn02 ,the liquid phase catalysis by Mn（ Ⅱ） and the catalysis by the solid phase components of pyrolusite. The liquid phase catalysis by Mn（Ⅱ） plays a dominant role all the time and compared with the solid catalysite. The liquid phase catalysis by Mn（Ⅱ） plays a dominant role all the time and compared with the solid catalysis by components of pyrolusite, the direct redox by MnO2 is in great strength during the initial twenty minutes whereas it may almost be neglected since then.