Why can a powder resin-coated iron remover remove iron?

Thread Content

We are conducting experiments on the ammonia-based desulfurization of flue gas from high-sulfur coal boilers to produce sulfurous acid AN for use by nearby enterprises. The flue gas is first treated with electrostatic dust removal, followed by wet scrubbing using power waves to remove dust; thereafter, it is absorbed with ammonia water to yield liquid sulfurous acid AN. After micro-porous filtration, a product with acceptable color is obtained. The problem is that the iron ion content in the absorbed product is around 10 ppm, and after further purification via micro-porous filtration, it drops to about 6 ppm. However, the users require this level to be below 1 ppm. I would like to know what iron removal process would be suitable. Additionally, I came across information online about iron removal devices that use powdered resin for filtration; it is said that such devices are used for the advanced treatment of steam condensate. What is the principle behind this? Can it be used for iron removal in our type of material? Please help take a look. Thank you.