| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a calcium chloride aqueous solution, by which a high-concentration calcium chloride aqueous solution can be produced while preventing the handling from becoming poor owing to viscosity increase at a lime milk production step, reducing the production cost, enhancing the production efficiency and dispensing with great capital investment. SOLUTION: The calcium chloride aqueous solution having 25 wt.% or higher concentration is manufactured by concentrating the milk of lime which is obtained by reacting unslaked lime with slaking water in a slaker or the like, by using a filter press, a decanter or the like so that the solid concentration is 25 wt.% or higher and then reacting the concentrated milk of lime with the ammonium chloride cake separated from a sodium bicarbonate-separated mother liquor at an ammonia soda process.
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