METHOD AND APPARATUS FOR RECOVERING K AND MG

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for effectively recovering K and Mg from condensed seawater in a high recovering ratio.

SOLUTION: (1) The method for recovering K and Mg has: a step of obtaining a fraction constituted by condensing K+and a fraction constituted by condensing Mg2+by processing condensed seawater by an electric dialysis device with an ion exchanging membrane: and a step of obtaining KCl by crystallizing the fraction constituted by condensing the K+. (2) The method for recovering K and Mg has: a step of carrying out solid/liquid separation of condensed seawater to Mg(OH)2and separated liquid A by subjecting the condensed seawater to reaction crystallization with alkaline solution; a step of separating the separated liquid A to CaCO3and separated liquid B by subjecting the separated liquid A to the reaction crystallization with a carbonate or carbon dioxide, and a step of obtaining KCl by subjecting the separated liquid B to crystallization processing. (3) An apparatus for recovering K and Mg includes an electric dialyzing device with an ion exchanging membrane, for obtaining the fraction in which K+is condensed and the fraction in which Mg2+is condensed from condensed seawater. (4) A recovering apparatus for recovering K and Mg has: a device for carrying out solid/liquid separation of condensed seawater to Mg(OH)2and separated liquid A by subjecting the condensed seawater to reaction crystallization with an alkaline solution; a device for carrying out the solid/liquid separation of the separated liquid A to CaCO3and separated liquid B by subjecting the separated liquid A to a reaction crystallization with the carbonate or the carbon dioxide; and a device for obtaining KCl by subjecting the separated liquid B to crystallization processing.

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