Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1990-09-26
1992-04-21
Hruskoci, Peter
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
204DIG13, 210720, 210721, 210725, 210727, 210756, 210904, 210912, 210913, 210919, C02F 156
Patent
active
051065088
ABSTRACT:
An integrated process for heavy metal and cyanide removal in aqueous waste stream from plating processes wherein cyanide is oxidized by hypochlorite at approximately pH of 11.5 and hexavalent chromium is reduced to trivalent chromium at ambient temperature with ferrous sulfate at pH of 9.5; excess hypochlorite from cyanide destruction reacts with ferrous sulfate and additional ferrous sulfate is added to reduce hexavalent chromium to trivalent chromium to allow hydroxide co-precipitation with hydroxides of the ferric iron and hydroxides of copper, chromium, zinc, cadmium, manganese, etc., which are then separated by settling and filtration.
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Hruskoci Peter
Long Joseph F.
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