| 摘要 |
<p>An electrolytic cell for the electrowinning of aluminium from alumina dissolved in a halide-containing molten electrolyte, has a cathode cell bottom made of a series of carbon cathode blocks (10) connected side-by-side transversally of the cell by glue or ramming paste, each one provided with steel or other conductive bars (11) across the cell for the delivery of current. A series of anodes (15) faces a pool or layer of molten aluminium on the cathode cell bottom which is preferably coated with an aluminium-wettable refractory coating (35). Movement of the aluminium pool (40) or layer is decreased by providing the top surfaces of the carbon blocks (10) with a series of parallel channels (25) or grooves along the direction of the conductive bars, transverse to the cell. In use, these channels (25) or grooves are covered by, and restrain, the pool or the layer of molten aluminium, in particular against movement in a direction transverse to the channels or grooves, so as to greatly decrease movement of the aluminium pool or so as to facilitate the collection/evacuation of aluminium, which substantially improves cell operation and extends cell life.</p> |
