How should iron contamination in resin be dealt with?
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How should iron contamination in resin be dealt with?
The resin darkens due to iron contamination, ranging from dark brown to completely black. Analyze the iron content in the resin; if Fe < 0.01%, there is no problem ； If Fe > 0.10%, it indicates severe pollution ； When Fe is between 0.01% and 0.10%, it represents moderate pollution. In the case of iron contamination, it can be treated by soaking in a 4% sodium sulfite (Na2SO3) solution for 4–12 hours, or by exposing the resin to 10% HCl for 5–12 hours; however, before such treatment, the resin must first be treated with table salt water to render it ineffective (cause a transformation).
In the case of iron contamination, it can be soaked in a 4% sodium sulfite (Na2SO3) solution for 4–12 hours, or the resin can be exposed to 10% HCl for 5–12 hours; however, before such treatment, the resin must first be treated with saline to render it ineffective (cause a transformation).
To remove iron contamination, salt or acid is used to reactivate the resin; sometimes oxalic acid or EDTA2Na is also required, and heating may be necessary, or the material can first be soaked in ethanol or similar substances. It depends!