Process for the Production of Magnesium Oxide
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United States of America Patent
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Jul 24, 2007
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Feb 1, 2005
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Abstract
A process for the recovery of magnesium oxide from a source containing magnesium salts, said process including the steps of: (a) adding an alkali and sulfur dioxide to the source containing magnesium salts, in a leach step to form a magnesium bi-sulfite containing leachate;(b) separating the insoluble materials from the leachate; (c) stripping excess sulfur dioxide from the leachate and precipitating the magnesium as solid magnesium sulfite hydrate; (d) separating the solid magnesium sulfite hydrate from the magnesium depleted leachate; and (e) calcining the solid magnesium sulfite hydrate and recovering the magnesium as magnesium oxide.
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