OCR Text |
Show 106 U. S. market for potash in the near future. Potassium Chloride Large amounts of carnallite, which contains both potassium chloride and magnesium chloride, may also be precipitated from the Lake by solar evaporation. The magnesium chloride can be leached from carnallite with fresh water in the same manner that magnesium sulphate can be leached from leonite or schoenite. The solid potassium chloride left from the leach step must be filtered or centrifuged, washed, dried, and screened. Large amounts of kainite may be precipitated from the Lake brine after the schoenite precipitation step and before the carnallite step. Garrett reports that kainite may be converted directly to potassium sulphate by adding water. In fact, Garrett proposes a process whereby the evaporation products other than common salt may be efficiently extracted from the Lake in the form of K2SO4, Na2S0^, and MgCl2 products that would be ready for the market. Magnesium Sulphate Magnesium sulphate may be precipitated from leach solutions from the leaching of astrakanite, leonite, or schoenite. Epsomite ( epsom salt) the most hydrated form, precipitates first at low temperatures. Crushing, filtering, centrifuging, washing, drying, dehydrating and screening are necessary to produce the desired product. :' Magnesium Chloride Magnesium chloride is the last evaporation product to be precipitated from the Lake brines. It can be precipitated in the form of |