Method of reactivating an electrolyzer
AssigneeDe Nora S.p.A.
InventorsCarlo Traini, Tomaso Leone
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Abstract
A reactivation method for an electrolyzer for the production of sodium hydrochlorite and chlorate, equipped with interleaved plates acting as anodes and cathodes, wherein at least the anode plates are provided with foraminous sheets having an electrocatalytic coating and a planar profile, said sheets being applied to the anode plates by means of a multiplicity of connection points.
Claims10
A method of reactivating an electrolyzer comprising elementary units consisting of interleaved anodes and cathodes, each anode and each cathode formed by a metal plate, characterized in that, said anodes are provided with foraminous sheets, made of perforated sheets or flattened expanded metal sheets applied to said metal plates by a multiplicity of connection points, said foraminous sheets having an electrocatalytic coating for chlorine evolution applied thereto characterized in that it comprises the following steps:
- removal from the electrolyzer of the anode metal plates provided with foraminous sheets,
- removal of the foraminous sheets having an exhausted electrocatalytic coating from the anode metal plates,
- removal of residual material from the anodic metal plates,
- washing and drying of the anodic metal plates,
- application of a new foraminous sheet having an active electrocatalytic coating on each anodic metal plate and
- connection of said anode metal plate and foraminous sheet by arc or resistance welding by means of a multiplicity of connection points.
Dependencies are inferred from the claim text.