Recovery of magnesium hydroxide and gypsum from natural or artificial brine, e.g. end liquor from potash works, uses ammonia or ammonium hydroxide for precipitation of magnesium hydroxide

摘要

Recovery of magnesium hydroxide and gypsum from natural or artificial brine containing magnesium sulfate and/or magnesium chloride, involves selectively precipitating magnesium ions as magnesium hydroxide using ammonia or ammonium hydroxide.