硫酸亜鉛存在下でのヘキサシアノ鉄(III)酸イオンの迅速還元によるヘキサシアノ鉄(II)酸亜鉛沈殿の生成

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タイトル別名
  • Formation of Zinc Hexacyanoferrate(II) Precipitate by Rapid Reduction of Hexacyanoferrate(III) ion in the Presence of Zinc Sulfate
  • 鉄シアノ錯体含有廃水の処理　Ｉ　　硫酸亜鉛存在下でのヘキサシアノ鉄（ＩＩＩ）酸イオンの迅速還元によるヘキサシアノ鉄（ＩＩ）酸亜鉛沈殿の生成

説明

In order to remove [Fe (CN)6]3- and [Fe (CN)6]4- from waste water as insoluble zinc hexacyanoferrate (II) the reduction of [Fe (CN)6]3- (0.641 × 10-3mol/l) at room temperature in the presence of zinc sulfate (2.5 times the molar quantity of [Fe (CN)6]3-) was compared with that in the absence of it at pH 6.4∼6.6 with seven kinds of reducing agents.<BR>It was found that zinc ion greatly accelerated the reduction of [Fe (CN)6]3- with relatively small amounts of reducing agents (1∼2 times the molar quantity of [Fe (CN)6]3-) when sodium sulfite, sodium disulfite, hydroxylammonium chloride, hydrazinium sulfate, sodium dithionite, or sodium thiosulfate was used. Thus, the formation of zinc hexacyanoferrate (II) was almost complete within 30 min (sodium thiosulfate) or several minutes (the other reducing agents), and the residual cyanide concentration in the filtrate was < 0.1ppm. t Studies on the Treatment of Waste Water Containing Iron Cyanid e Complexes. I.

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