Process and apparatus for treating sodium-nitrate-...

Details Process and apparatus for treating sodium-nitrate-... Process and apparatus for treating sodium-nitrate-...

C - Chemistry, Metallurgy

25

F

204/122, 204/86

C25F 1/06 (2006.01) B23H 3/10 (2006.01) C25F 7/02 (2006.01)

Patent

CA 1230845

ABSTRACT OF THE DISCLOSURE The present invention relates to a process for treat- ing sodium-nitrate-containing electrolytes in the electro- chemical cleaning of surfaces of iron-containing workpieces. By adding an oxidizing agent, particularly ozone, an increased formation of nitrite in the electrolyte and associates therewith a premature passivation of the workpiece surface during the electrochemical cleaning operation are avoided. An apparatus for oxidizing the electrolyte comprises a treatment station which has an ozone producer and a reactor and is present in the electrolyte cycle comprising an electrochemical treatment sta- tion in which the surfaces of the workpieces are electrochemi- cally cleaned, a storage tank for which the electrolyte passes to said electrochemical treatment station, a sludge separator which separates sludge from the electrolyte passing from said electrochemical treatment station and for which the electrolyte passes to the storage tank and at least one pump for conveying the electrolyte in the cycle.

446621

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