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2. 发明授权

US3852044A Recovery of substantially potassium-free hydrated magnesium chloride from contaminated aqueous solutions 失效
标题翻译：从污染水溶液中回收大量无钾水合氯化镁
公开(公告)号：US3852044A
公开(公告)日：1974-12-03
申请号：US87630669
申请日：1969-11-13
申请人： GREAT SALT LAKE MINERALS
发明人： NEITZEL U , FLINT H , LUKES J
IPC分类号： C01F5/30 , B01D9/02 , C01D1/30 , C01F5/26
CPC分类号： C01F5/30 , C01P2006/80
摘要： Aqueous solutions containing magnesium chloride as the major dissolved salt but contaminated with sulfate, potassium and sodium to the extent that magnesium chloride produced by evaporating the solution is unacceptably contaminated with potassium, sodium, and sulfate impurities are concentrated to at least near magnesium chloride hexahydrate saturation and are then cooled sufficiently to reduce the potassium concentration to below about 1 mole and the sodium concentration to below about 1 1/2 moles per 1000 moles water. The thus-concentrated solutions are then treated to the extent necessary to reduce the concentration of sulfate to below about 4 moles per 1000 moles water. The remaining brine is evaporated to obtain substantially pure, hydrated magnesium chloride, usually bischofite, containing no more than a few parts per million of potassium impurity. The process is particularly adapted to the production of substantially pure bischofite from brines of the type occuring in the Great Salt Lake of Utah.
摘要翻译：含有氯化镁作为主要溶解盐但被硫酸盐，钾和钠污染的水溶液，使得通过蒸发溶液产生的氯化镁被不可接受地被钾，钠和硫酸盐杂质污染的程度被浓缩至至少接近氯化镁六水合物饱和度然后充分冷却以将钾浓度降低至低于约1摩尔，并将钠浓度降低至低于每1000摩尔水约11/2摩尔。然后将如此浓缩的溶液处理至必需的程度，以将硫酸盐浓度降低至每1000摩尔水低于约4摩尔。将剩余的盐水蒸发以获得基本上纯的，水合的氯化镁，通常是二水合镁，其含有不超过百万分之几的钾杂质。该方法特别适用于从位于犹他州大盐湖的盐水生产基本上纯的双草铁矿。

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