METHOD FOR EXTRACTION OF POTASSIUM CHLORIDE FROM BRINE

摘要

The present invention relates to a method of extracting potassium chloride from salt water, which comprises the following steps: separating salt water into a solution containing monovalent ions and a solution containing divalent or more ions using a separation membrane with negative charge on the surface; evaporating the solution containing monovalent ions to obtain precipitates; inserting the precipitates into a solution saturated with sodium chloride and potassium chloride; inserting a surfactant into the solution saturated with sodium chloride and potassium chloride and containing the precipitates for changing the surface of the potassium chloride to have hydrophobicity; and collecting the potassium chloride with the hydrophobic surface using bubbles. [Reference numerals] (AA) Precipitates of salt water; (BB) Floating materials after flotation