Activation of cathode

C - Chemistry – Metallurgy – 25 – B

Patent

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C25B 1/26 (2006.01)

Patent

CA 2760094

The present invention relates to a process for production of alkali metal chlorate, and to a method of activating a cathode comprising electrolyzing an electrolyte comprising alkali metal chloride in an electrolytic cell in which at least one anode and at least one cathode are arranged wherein a) said electrolyte comprises chromium in any form in an amount ranging from about 0.01 -10-6 to about 500- 10-6 mol/dm3 b) said electrolyte comprises molybdenum, tungsten, vanadium, manganese and/or mixtures thereof in any form in a total amount ranging from about 0.1 -10-6 mol/dm3 to about 0.5-10-3 mol/dm3.

La présente invention concerne un procédé de préparation d'un chlorate de métal alcalin, et un procédé d'activation d'une cathode qui comporte l'électrolyse d'un électrolyte comportant un chlorure de métal alcalin dans une cellule électrolytique dans laquelle au moins une anode et au moins une cathode sont agencées, a) ledit électrolyte comportant du chrome, quelle que soit sa forme, en une quantité allant d'environ 0,01-10-6 à environ 500-10-6 mol/dm3, b), ledit électrolyte comportant du molybdène, du tungstène, du vanadium, du manganèse et/ou des mélanges de ceux-ci, quelle que soit leur forme, en une quantité totale allant d'environ 0,1-10-6 mol/dm3 à environ 0,5-10-3 mol/dm3.

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