Iron analysis in saline water
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The resin in our company’s resin tower has turned red, as has the surface of the ion exchange membrane; this indicates that the iron content in the brine or hydrochloric acid is relatively high. However, the analysis results have always shown normal values, so we now suspect that there is an issue with the analysis method. I hope friends from Sichuan can help provide detailed analysis methods. Thank you!
Resins with high iron content will exhibit varying degrees of caking.
Resin towers cannot remove iron; it is necessary to determine whether the resin has turned red on the surface or inside. Resin towers have a certain capacity to retain certain substances – they might have retained potassium ferrocyanide (a bulking agent found in salts) or iron hydroxide, both of which cause the resin to turn red. If the ion membrane is red, it is generally an iron complex that remains insoluble in acidic conditions. Take a sample and do an atomic absorption analysis to find out. Sampling: hydrochloric acid, crude salt, primary brine, weak brine; resin samples are sent back to the manufacturer for testing.