PROCESS FOR PRODUCING A CARBON PASTE FOR THE MANUFACTURE OF HIGH-DENSITY ELECTRODES

摘要

The process according to the invention proposes, for the mixing of a solid and dry granular mixture and of a liquid bituminous binder, in an amount required for the manufacture of the electrodes (6), the solid and dry granular mixture being a mixture of two fractions of constituents, of which one is referred to as a coarse fraction (1a, 2a) that includes aggregates, and the other fraction is a fraction of submillimetric fines (1b, 2b), that the mixing comprise at least two consecutive mixing steps, a first (102a) of which, referred to as a step of preimpregnating the aggregates, consists in mixing the coarse fraction (2a) of the granular mixture with a portion (3a) of the bituminous binder, in an amount that is at least sufficient to coat the aggregates and at least partially fill open porosities of the aggregates, and is followed by a second mixing step (102b), referred to as a packing step, which consists in mixing the coarse fraction (4a) preimpregnated with bituminous binder and derived from the first mixing step (102a), with the remainder (3b) of the bituminous binder, required for the manufacture of the electrodes (6), and with the fraction of fines (2b) of said granular mixture. The process of the invention may be carried out by equipment comprising two mixer stages, in continuous mode or batch mode, with the aid of two mixers, each of which carries out one of the two mixing steps, or with the aid of a single mixer.