Process for the removal of cyanides from effluent

Details Process for the removal of cyanides from effluent Process for the removal of cyanides from effluent

1980-01-21

1981-02-10

Castel, Benoit

Liquid purification or separation

Processes

Ion exchange or selective sorption

210904, 210716, 210722, B01D 1500

Patent

active

042500303

ABSTRACT:
A method is disclosed for removal of free and complex cyanides from water-containing industrial effluents and wastes by treatment with insoluble solid iron sulfides at a pH in the range of about 7.0 to 8.5. The insoluble solid iron sulfides can be chemically prepared prior to treatment or prepared in situ, usually of a particle size smaller than about 5.mu., or supplied in the form of naturally occurring iron sulfides such as pyrrhotite or pyrite having a particle size smaller than about 300.mu., preferably smaller than about 150.mu.. The weight ratio of iron sulfide to total cyanide in the effluent is greater than 2:1, preferably greater than about 5:1 for prepared iron sulfides and greater than about 100:1 for mineral sulfides. The presence of a reducing agent such as ferrous ions or sodium sulfite to maintain a non-oxidizing environment during treatment enhances removal of cyanide.

REFERENCES:
patent: 2194438 (1940-03-01), Wernlund et al.
patent: 2845330 (1958-07-01), Zabban
patent: 3736239 (1973-05-01), George et al.

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