Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1980-09-25
1983-07-19
Hearn, Brian E.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423101, 423143, 423364, 423371, 210904, 210912, C01C 308, C02F 158
Patent
active
043943560
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This report concerns a simple process for precipitation, recuperation and re-use of cyanides from rinsing solutions, allowed in the industrial methods for the electrodeposition of metals. It is in the electroplating plant of industry that more economical and practical systems and methods are sought for the purifying treatment of rinsing solutions. The work developed in this sector of electrochemistry is rather complicated and requires specialized personnel trained for the use of the equipment employed; it is expensive due to high costs of energy and specialized labour. The large amount of chemical products lost in the electroplating industry is common knowledge, creating, as a result of treatment for destroying poisons, high, heavy metal content slurries, which will be lost.
The Recuperation of Cyanides from Rinsing Solutions of Cyanidric Processes for Electrodeposition of Metals serves to disperse with chemical products in the treatment of the cyanide bearing rinsing solutions, transforming the soluble cyanide into insoluble cyanide, thus allowing their removal through filtration or deposition. The insoluble cyanide may, therefore, be easily re-used industrially. The process referred to, by inclusion on the technical side of electrochemistry, represents an innovation over the traditional processes for the treatment of residues originating in electroplating processes.
BACKGROUND ART
Everyone in the trade knows that the treatment of cyanide bearing rinsing solutions is attained mainly through the poison elimination process by destruction of the cyanide. Another known process, the recycling, is based upon the evaporation of the solvent in the rinsing solutions, by using energy to concentrate the fluid which will be re-used in the respective dips. other processes are also known which use ion exchangers, involving high capital investment for equipment and the loss of chemical products through their destruction.
DISCLOSURE OF THE INVENTION
The process which is now proposed allows the total precipitation of the cyanides in the insoluble form, together with the cyanide metals and their recuperation for industrial re-use.
According to the amount of cyanide in the rinsing solutions, adequate quantities of metallic salts shall be added; these will correspond to the metal associated with the cyanide in the rinsing solution and in the electroplating dip. As an example, the zinc sulphate and/or chloride for rinsing solutions of the cyanidric zinc dip, or else the copper sulphate and/or chloride for the rinsing solution of the cyanidric copper dip, associated with acid or alkaline salts which control the pH value of the rinsing solution and the valency of the metallic ions, according to the type of metal, thus obtaining a full transformation of all the free cyanide and cyanides associated in complex salts to a simple metallic cyanide, insoluble in water with an adequate pH in the rinsing solutions, without releasing cyanidric gases.
All the cyanide in the water is thus transformed into an insoluble salt, and may be removed from the rinsing solution through deposition or filtration.
By using for each type of metal in the electrodeposition of metals process separate rinsing tanks without danger of intermixing metals, the metallic cyanides precipitated by means of the proposed process, that is the RECUPERATION OF CYANIDES FROM RINSING SOLUTIONS OF CYANIDRIC PROCESSES FOR ELECTRODEPOSITION OF METALS, may be directly re-used in the respective dips after their rinsing (the insoluble precipitate) in the filters or by deposition with water, until the rinsing water attains a density of 1.000 or 0.degree. Be, thus releasing the precipitated cyanide from the other soluble components. The same process presented may also be used for the precipitation and/or recuperation of cyanide from any cyanidric liquid already used in the electroplating of zinc, cadmium, copper, silver, gold and their alloys.
The initial experiments have already demonstrated the simplicity of the RECUPERATION OF CYANIDES FROM RINSING SOLUT
REFERENCES:
patent: 1614523 (1927-01-01), Cooper
patent: 2845330 (1958-07-01), Zabban
patent: 3736239 (1973-05-01), George
Sewage and Industrial Wastes, vol. 22, No. 9 (Sep. 1950) pp. 1192-1199 (Milne).
Bartolo Jose B.
Peuser Michael F.
Hearn Brian E.
Mechlin Wilmer
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