Cement for cathode blocks

Details Cement for cathode blocks Cement for cathode blocks

C - Chemistry, Metallurgy

25

B

31/158

C25B 11/12 (2006.01) C04B 35/52 (2006.01) C04B 37/00 (2006.01)

Patent

CA 1271324

Abstract The invention relates to a cement for the cathode blocks of electrolytic cells, e.g. Hall-Heroult cells used for the production of aluminum. The cement comprises a carbonaceous aggregate of particle size smaller than 48 Tyler mesh, a curable water-soluble liquid polymeric resin (preferably a phenol-formaldehyde resin), water and normally a curing agent for the resin. The water is used in such an amount that the proportion of the resin can be reduced without adversely affecting the viscosity of the cement at ambient temperature. The cement carbonizes when the cell is used and has a linear shrinkage of less than 5%, which reduces the tendency of the carbonized cement to crack during operation of the cell.

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