Hard and abrasion resistant surfaces protecting cathode...

C - Chemistry – Metallurgy – 25 – C

Patent

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Details

C25C 3/08 (2006.01) C04B 41/50 (2006.01) C04B 41/52 (2006.01) C04B 41/87 (2006.01) C04B 41/89 (2006.01)

Patent

CA 2230862

A cathode block of a cell for the electrowinning of aluminium comprises a carbon body having a hard and abrasion-resistant surface obtained by heating an applied layer of particulate refractory hard metal boride with a bonding material which when heated reacts with the refractory hard metal boride and with carbon. In particular a slurry of particulate refractory boride in colloidal alumina is dried and heated under an inert or a reducing atmosphere, formed by a bed of carbon powder, and reacted to form at least one stable compound between aluminium derived from colloidal alumina; boron and titanium derived from the titanium diboride; and carbon from the reducing atmosphere.

Cette invention se rapporte à un bloc cathodique d'une cellule d'extraction électrolytique d'aluminium qui comporte un corps en carbone ayant une surface dure et résistante à l'abrasion que l'on obtient en chauffant une couche d'un borure de métal dur réfractaire particulaire appliquée avec un liant qui, lorsqu'il est chauffé, réagit avec le borure de métal dur réfractaire et avec le carbone. En particulier, on sèche et on chauffe un coulis de borure réfractaire particulaire dans de l'alumine colloïdale sous atmosphère inerte ou réductrice, constituée d'un lit de poudre de carbone, et on le fait réagir pour former au moins un composé stable entre de l'aluminium provenant de l'alumine colloïdale, du bore et du titane provenant du diborure de titane et du carbone provenant de l'atmosphère réductrice.

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