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ポリ塩化アルミニウム水溶液に、３価の鉄塩水溶液を鉄とアルミニウムの原子比（鉄／アルミニウム）が０．３未満となるように添加、混合することを特徴とする鉄とアルミニウムの原子比（鉄／アルミニウム）が０．３未満の鉄含有ポリ塩化アルミニウム水溶液の製造方法。A method for producing an iron-containing aqueous polyaluminum chloride solution having an atomic ratio of iron to aluminum (iron/aluminum) of less than 0.3, comprising adding and mixing an aqueous solution of a trivalent iron salt to an aqueous polyaluminum chloride solution so that the atomic ratio of iron to aluminum (iron/aluminum) is less than 0.3.ポリ塩化アルミニウム水溶液に、該水溶液のｐＨを１．５〜３．５の範囲に維持するようにアルカリ化合物を添加しつつ、３価の鉄塩水溶液を鉄とアルミニウムの原子比（鉄／アルミニウム）が０．３以上となるように添加、混合することを特徴とする鉄とアルミニウムの原子比（鉄／アルミニウム）が０．３以上の鉄含有ポリ塩化アルミニウム水溶液の製造方法。A method for producing an iron-containing aqueous polyaluminum chloride solution having an atomic ratio of iron to aluminum (iron/aluminum) of 0.3 or more, comprising adding an aqueous trivalent iron salt solution to an aqueous polyaluminum chloride solution so that the atomic ratio of iron to aluminum (iron/aluminum) is 0.3 or more, while adding an alkaline compound to the aqueous polyaluminum chloride solution so as to maintain the pH of the aqueous solution in the range of 1.5 to 3.5, and then mixing the solution.上記アルカリ化合物が炭酸アルカリ及び苛性アルカリからなる群から選択される少なくとも１種である請求項２に記載の製造方法。3. The method according to claim 2, wherein the alkaline compound is at least one selected from the group consisting of alkali carbonates and caustic alkalis.上記アルカリ化合物として、上記苛性アルカリと上記炭酸アルカリとをモル比０．５（苛性アルカリ／炭酸アルカリ）以下で併用する請求項３に記載の製造方法。4. The method according to claim 3, wherein the alkaline compounds are a combination of the caustic alkali and the alkali carbonate in a molar ratio (caustic alkali/alkali carbonate) of 0.5 or less.
JP3343597A1997-02-181997-02-18
Method for producing iron-containing aqueous solution of polyaluminum chloride
PendingJPH10230102A
(en)
Process for the manufacture of an industrial aqueous solution of sodium chloride and use of the aqueous sodium chloride solution thus obtained for the electrolytic manufacture of an aqueous sodium hydroxide solution, for the manufacture of sodium carbonate and for the manufacture of sodium chloride crystals.