Method for electrochemically removing metal impurities

C - Chemistry – Metallurgy – 01 – D

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C01D 1/40 (2006.01) C25C 7/02 (2006.01)

Patent

CA 2205073

A method for electrochemically purifying solutions with a pH higher than 14 to reduce metal impurities to the level of traces. The method comprises processing the solution in an electrolytic cell in which the cathode has a fibrous web produced from a mixture of fibres including at least one fraction consisting of electrically conductive fibres and a binder selected from fluoropolymers, said fibrous web being deposited on an electrically conductive porous support. Said cathode may also be combined with a diaphragm or a membrane. A cathode having a fibrous web produced from a mixture of carbon fibres, cellulose compounds, and a cationic polymer such as cationic starch is also disclosed.

la présente invention a pour objet un procédé de purification de solutions dont le pH est supérieur à 14 par voie électrochimique, dans le but de réduire les impuretés métalliques à l'état de traces. Le procédé selon l'invention consiste à traiter la solution dans une cellule d'électrolyse dont la cathode comprend une nappe fibreuse obtenue à partir d'un mélange de fibres dont au moins une fraction est constituée par des fibres conductrices de l'électricité et d'un liant choisi parmi les polymères fluorés, ladite nappe fibreuse étant déposée sur un support poreux conduisant l'électricité. Par ailleurs, ladite cathode peut être associée à un diaphragme ou à une membrane. Enfin, l'invention a pour objet une cathode comprenant une nappe fibreuse obtenue à partir d'un mélange de fibres de carbone, de composés à base de cellulose, d'un polymère cationique, tel que l'amidon cationique.

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