PRODUCTION OF PURE MAGNESIUM CHLORIDE SOLUTION FROM SILICEOUS MAGNESIUM MINERALS

摘要

A process for the production of pure magnesium chloride liquor from siliceous magnesium minerals comprises the steps of 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, 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.