Recovery of magnesium values from magnesium and sulfate containng aqueous salt solutions
Abstract
Abstract A PROCESS FOR RECOVERING MAGNESIUM VALUES FROM AQUEOUS SALT SOLUTIONS CONTAINING MAGNESIUM AND SULFATE IONS, COMPRISING THE ADDITION THERETO OF SUFFICIENT ALKALI METAL CHLORIDE SALTS, SPECIFICALLY SODIUM AND/OR POTASSIUM CHLORIDE, TO PROVIDE FOR CONVERSION OF ALL OF THE MAGNESIUM VALUES TO MAGNESIUM CHLORIDE AND ALSO TO PROVIDE SUFFICIENT ALKALI METAL ION TO COMBINE WITH THE SULFATE THE PRESENCE OF STEAM AT ABOUT 500-750*C., PREFERABLY 600-700*C., TO CONVERT THE MAGNESIUM CHLORIDE VALUES TO MAGNESIUM OXIDE WITH EVOLUTION OF HYDROGEN CHLORIDE, WATER WASHING THE CALCINATE TO SOLUBILIZE THE SOLUBLE SALTS INCLUDING SALTS OF SODIUM, POTASSIUM, LITHIUM AND BORON, AND SEPARATING THE MAGNESIUM OXIDE FROM THE SOLUBILIZED SALTS. THE MAGNESIUM OXIDE OBTAINED IN THIS WAY IS OF HIGH PURITY AND MAY BE REACTED WITH HYDROCHLORIC ACID, SUCH AS THAT EVOLVED FROM THIS PROCESS, TO PRODUCE HIGH PRUITY MAGNESIUM CHLORIDE FOR USE IN THE ELECTROLYTIC PRODUCTION OF MAGNESIUM METAL.
Inventors
- 👤 Lockwood W Ferris
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