C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/12, 362/54
C02F 1/00 (2006.01) C01C 3/12 (2006.01) C02F 9/00 (2006.01)
Patent
CA 1089573
ABSTRACT OF THE DISCLOSURE A method for treating a waste water containing cyanide ions, which comprises (1) adding a ferrous salt to the waste water to convert the cyanide ions in it to a precipitate of ferrous ferrocyanide and insoluble Turnbull's blue, (2) adding an alkali agent to the waste water to convert the remaining ferrous ion to Fe(OH)2, and (3) adding a ferric salt to this waste water to precipitate [Fe(CN)6]4- formed by addition of the alkali agent as insoluble Berlin blue. The method permits a very efficient removal of the cyanide ions from the cyanide ion-containing waste water. It is particularly suitable for the treatment of gas liquor which has been discharged from the step of quenching coke oven gas and treated with activated carbon and activated sludge.
291629
Harada Hiroshi
Hashimoto Teruo
Iguchi Youko
Iwase Toshio
Shibuya Yukihiko
George H. Riches And Associates
Niigata Engineering Co. Ltd.
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