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Purifying waste waters contg. cyanide ions - by consecutively adding ferrous salt, alkali and then ferric salt to ppte. prussian blue
Purifying waste waters contg. cyanide ions - by consecutively adding ferrous salt, alkali and then ferric salt to ppte. prussian blue
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机译:净化废水(续)。氰离子-依次添加亚铁盐,碱金属盐和铁盐至ppte。普鲁士蓝
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摘要
Cyanide-contg. waste waters are treated by (1) adding an Fe (II) salt e.g. FeCl2 or FeSO4 to the waste water and precipitating CN- as Fe (II) ferrocyanide and insoluble Turnbull's blue, (2) adding an alkaline material to convert Fe (II)-ions to Fe(OH)2 and (3) adding an Fe (III) salt e.g. FeCl3 or Fe2(SO4)3 to form Fe (CN)6 4- as insoluble Prussian Blue on addn. of an alkaline agent to waste water. Process allows CN- removal from biologically oxidised waste waters having a low CN- concn.
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