Thermo
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I am trying to obtain ferrous sulfate heptahydrate crystal from a liquor which is rich in Fe2+ and Fe3+ sulfate and sulfuric acid. However I can only achieve crystal (more likely powder) form of FeSO4.7H2O (37%) mixed with 58% Rhomboclase (H5O2)+Fe+++(SO4)2•2(H2O) with minor impurities. How can I achieve pure FeSO4.7H2O under these conditions? The liquor is too acidic and the pH is -0,2. I tried to reduce iron (III) ions to iron (II) with reducing agents but that didn't work well.