两室中性膜电解过程中铁离子的沉积特性研究

以亚硫酸钠和亚硫酸氢钠溶液模拟钠碱烟气脱硫吸收富液,应用二室中性膜电解装置,对铁离子在阴极板的沉积现象与沉积规律进行研究，确定了沉积物组成成分与铁离子沉积机理,明确了铁离子沉积与膜电解操作参数间的相互关系,结果表明阴极板沉积物中的铁离子主要为硫化亚铁,铁离子沉积量随膜电解电压和硫碱比r增大而明显增大；此外，膜电解过程中随着铁离子沉积于膜表面和阴极板表面的沉积量增加，阴极室压降由于阴极板结垢而降低,膜阻由于模孔堵塞而增大。

Study on sedimentation rule of iron ion of FGD absorbent liquor

Sodium bisulfite and sodium sulfite were dissolved in water according to certain proportion to simulate the liquor, and a two-compartment electrolysis cell equipped with a neutral-exchange membrane was used. On basis of the sedimentation phenomenon of iron ion on the cathode, sedimentation rule of iron ion and the relationship between sedimentation of iron ion and various parameters, such as electrolytic voltage, sulfur-to-alkali ration, were investigated. It was showed that the sediment on the cathode was FeS and sedimentation mass was found to increase with the increment in electrolytic voltage and the rate of sulfur and alkali. In addition, voltage dropout of cathode cell decreased and the voltage dropout of neutral-exchange membrane increased with the increase of the sedimentation mass of iron ion on the membrane and cathode in the membrane electrolysis process.