Production of pure magnesium chloride solution from siliceous magnesium minerals
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United States of America Patent
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Feb 25, 1992
Issued Date -
N/A
app pub date -
Aug 20, 1990
filing date -
Nov 21, 1986
priority date (Note) -
Expired
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Abstract
A process for the production of pure magnesium chloride liquor from siliceous magnesium minerals comprises the steps of continuously leaching the siliceous magnesium mineral with a hydrochloric acid solution at a temperature higher than 50.degree. C. but below the boiling point and in such a manner as to maintain the pH of the slurry below 1.5 to prevent the formation of silica gel, continuously reacting such slurry with a reactive magnesia in order to raise the pH to 4.0-7.0 to precipitate substantially all the impurities from solution while preventing silica gel formation, and performing a solid/liquid separation of the slurry on suitable filtration equipment to obtain pure magnesium chloride liquor.
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