C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
117/36
C23C 24/04 (2006.01)
Patent
CA 1079004
ABSTRACT OF THE DISCLOSURE This invention relates to an improved system for preventing water pollution in surface treatment of metals, e.g., in coating base metal parts within adherent coating of zinc, cadmium or similar protective metal by means of wet impact plating or electroplating, or in chromating or phosphating metal surfaces. A preferred embodiment relates to a wet impact plating process wherein the several solutions used in cleaning or otherwise preparing the work, in plating it and in rinsing it are individually segregated after use and re-used in consecutive plating cycles in a special manner that release of ecologically objectionable effluent is eliminated and chemical and metal components fed into the process are conserved instead of being discarded after each plating cycle. Consequently, the need for removing pollutants from process effluents can be avoided, the large volume of fresh water heretofore required to operate such a process is greatly reduced and the discard of ecologically objectionable process effluent into sewers is avoided. Liquid effluent which is not suitable for direct recycling and re-use within the process can be rectified for further use. A consider- able proportion of the water used in the process is normally lost through evaporation as the exothermic process progresses, such that the plating liquid withdrawn from the plating barrel after completion of each plating step is a relatively concentrated slurry. When this slurry can no longer be converted to chemicals useful for recycling, after precipitation and decanting of the clear liquid, water in the now very dense slurry can be evaporated from it simply by leaving the slurry containers uncovered or by using waste process heat to accelerate evaporation and the residual solids disposed of by burial or other appropriate means.
273769
Na
Waldes Kohinoor
LandOfFree
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