Oxidative removal of aqueous cyanide by manganese(IV)-containing

Details Oxidative removal of aqueous cyanide by manganese(IV)-containing Oxidative removal of aqueous cyanide by manganese(IV)-containing

1996-08-23

1998-01-06

Hruskoci, Peter A.

Liquid purification or separation

Processes

Chemical treatment

210760, 210762, 210763, 210904, 502208, C02F 172

Patent

active

057050783

ABSTRACT:
Manganese(IV)-containing oxides are effective catalysts for oxidation of water-soluble cyanide over a wide pH range (0.5-12) and temperature (15.degree.-250.degree. C.). Oxygen is the preferred oxidizing agent at partial pressures between about 0.2 and 5 atmospheres (2.9-75 psi, 20-517 kPa). Electrolytically deposited MnO.sub.2 is one preferred form of the catalyst. Another preferred manganese(IV)-containing oxide is the group of cation-stabilized manganese(IV)-containing oxides illustrated by cryptomelane. Yet another preferred form of manganese(IV)-containing oxide is a group of crystalline manganese phosphate compositions having an extended network and an empirical composition on an anhydrous basis expressed by an empirical formula of:

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