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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: hefajst on April 23, 2015, 12:12:24 PM

Title: Adjusting the iron content in zinc phosphate bath
Post by: hefajst on April 23, 2015, 12:12:24 PM

Hello,
I have one problem. We have a solution of zinc phosphate, which is held at a pH value of 2 and at a temperature of about 55 °C. at certain times in our production we encounter a problem with rising concentrations of Fe (II) ions. When the concentration of Fe (II) ions rises to about 7 g/L the solution as a whole is not suitable for use and has to be discarded. So, do you have any idea how could selectively remove Fe (II) ions from this solution?
Thank you.

Title: Re: Adjusting the iron content in zinc phosphate bath
Post by: Arkcon on April 23, 2015, 12:42:14 PM

Your conditions don't seem too harsh for an ion exchange resin to work, but only if you can find one selective for iron over zinc.  Perhaps the only solutions is volume?  Making sure the bath is large enough to ignore the iron levels.

Title: Re: Adjusting the iron content in zinc phosphate bath
Post by: hefajst on April 24, 2015, 01:03:36 PM

Solution volume is 1000 liters. So which ion exchange do you recommend.