Method of producing carbonaceous blocks in a tunnel type...

Details Method of producing carbonaceous blocks in a tunnel type... Method of producing carbonaceous blocks in a tunnel type...

C - Chemistry, Metallurgy

04

B

18/1

C04B 35/532 (2006.01) C25C 3/12 (2006.01)

Patent

CA 1201563

ABSTRACT OF THE DISCLOSURE A method of producing carbonaceous blocks, and more particularly a method of manufacturing anodes for the elec- trolytic reduction of aluminium, consists of coating the blocks with an antioxidizer protective powder and calcining them while they are passed through a tunnel type furnace in an oxidizing atmosphere in conformity with thermal conditions established within the area surrounding and directly con- tacting at least part of the external surfaces of the coated bodies such that as the blocks reach a temperature of 200- 600°C at which they release volatile organic substances, the oxidizing atmosphere has a temperature of at least 550°C and an oxygen content of at least 2% by volume of the total volume of the dry gas present. Complete combustion of the volatile substances is accomplished in the furnace to yield gases which are free of the volatile organic substances. The blocks later attain a final baking temperature of up to about 1,200°C.

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