To provide a mineral liquid manufacturing method for obtaining, from sea water without heating it, mineral liquid having a sufficiently high concentration of mineral component such as magnesium and calcium and having a satisfactorily reduced sodium concentration.
The high-concentration mineral liquid manufacturing method comprises: a step (I) of separating sea water into concentrate (A1) and membrane permeate (A2) by treating sea water with a reverse osmosis membrane; a step (II) of obtaining concentrate (B1) in which cation concentration and monovalent anion concentration are high and bivalent or more anion concentration is low by treating the concentrate (A1) with an electrodialyzer constituted by disposing a pair of monovalent anion selective permeable anion exchange membrane and cation exchange membrane between anode and cathode; and a step (III) of obtaining concentrate (C1) as high-concentration mineral liquid in which bivalent or more cation concentration is high and monovalent cation concentration is low by treating the concentrate (B1) with an electrodialyzer constituted by disposing a pair of monovalent cation selective permeable cation exchange membrane and anion exchange membrane between anode and cathode.
COPYRIGHT: (C)2006,JPO&NCIPI
Takashi Sumida
Hirohisa Kawakita
Mountain saki Yoshifumi
Atsushi Yoshimura
Ryosuke Aoki
Yoshio Sugaya
Toda Hiroshi
Hiroyuki Yamamura
AGC Engineering Co., Ltd.
TORAY INDUSTRIES,INC.
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