Degussa Aktiengesellschaft

Degussa Gmbh

Degussa Atiengesellschaft

Roy Norcross

Andrew Griffiths

M Quamrul Ahsan

Friedrich W Merz

Helmut Knorre

Stephen Gos

Gregg A Vickell

Jaganmay Chattopadhyay

Ernest Haug

Gerhard Scherer

A process for treating effluent containing cyanide by contacting the effluent with a mixture formed from a source of hydrogen peroxide and a source of magnesium ion to oxidize the cyanide. The ratio of hydrogen peroxide to cyanide is up to 10:1 and the amount of magnesium ion is present in the concentration of 0.1 to 1000 ppm per liter of aqueous waste effluent.

Process for the detoxification of effluents containing free or complexed

This invention pertains to a method of treating cyanide contained in wastewater with particularly high levels of solids in the stream. The process involves either simultaneous or step-wise dosage of hydrogen peroxide in the form of an aqueous solution of a concentration between 35% to 90% by weight, preferably at least 50% by weight, and SO.sub.2 either in the form of gaseous SO.sub.2 or solution of sodium and/or potassium sulfite or metabisulfite resulting in the conversion of cyanide ions to non-toxic cyanate ions.

Cost effective process for detoxification of cyanide-containing effluents

A process is disclosed for the detoxification of effluents containing cyanide by treating with a mixture of hydrogen peroxide and phosphoric acid.

Process for the removal of cyanide from wastewaters

Treatment of effluent containing cayanide is disclosed wherein a mixture of H.sub.2 SO.sub.4 and H.sub.2 O.sub.2 with between 0.01 and 0.5 moles of H.sub.2 SO.sub.4 per mole of H.sub.2 O.sub.2 is used.

Process for the treatment of effluents containing cyanide and other

A process for treating effluents contaiing cyanide from mining operations wherein magnetic separation is used prior to treatment with hydrogen peroxide.

Process for the detoxification of effluents from ore processing

A process for the treatment of aqueous effluent containing cyanide and toxic or heavy metals, wherein the effluent is contacted with a sufficient amount of hydrogen peroxide to oxidize at least a substantial portion of the cyanide in the effluent in the presence of sufficient trimercaptotriazine to react with a substantial portion of the metal present in said effluent, and precipitating said metal component.

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Norwalk, CT, United States of America

Roy Norcross