The effect of iron ions in secondary brine on chelating resins

Trivalent iron ions can cause resin poisoning, and the most obvious sign of this is that the resin turns reddish-brown

If the iron ion level is too high, there is definitely a problem with the pipeline; please conduct a thorough inspection, and consider replacing it with a plastic composite pipe with a steel framework

Excessive iron ions can cause caking of the chelating resin, increase the operating pressure in the resin column, and affect the efficiency of resin regeneration as well as the quality of brine purification.

Iron ions can poison the resin; it usually takes on a reddish-brown color, which is easily recognizable. Trivalent iron has oxidizing properties and can destroy the structure of the resin, while when divalent iron is absorbed by the resin, its volume decreases, causing it to flow out of the water cap. Moreover, once the resin has absorbed iron, it is difficult to regenerate. Iron ions have a significant impact on ion exchange resins, and this is mainly related to the valence of the cations; the higher the valence, the harder it is for these ions to be desorbed from the resin, and the greater the risk of resin poisoning. There are generally two scenarios: one is when iron compounds enter the exchange bed in a suspended state. Due to the adsorption effect of the resin, its micropores become blocked. Another method involves iron divalent ions entering the exchange bed where they undergo an exchange reaction with the resin; after being adsorbed, some of the divalent iron ions are oxidized to trivalent form. During regeneration, the iron ions cannot be completely replaced by hydrogen ions, and the longer the adsorption time, the more difficult it is to remove them!