Removal of ferric iron as hematite at atmospheric pressure
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United States of America Patent
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Mar 20, 2018
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app pub date -
Jun 21, 2013
filing date -
Jun 22, 2012
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Abstract
A process for the removal of ferric iron as hematite from a nickel solution containing ferric and ferrous ions including the steps of: raising the temperature of the nickel solution to between 90° C. and the boiling point of the solution at atmospheric pressure; raising the pH of the nickel solution to be between 2 and 3; and adding a hematite seed to facilitate hematite precipitation, wherein ferric ions are precipitated as hematite in a predominantly crystalline form.
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