METHOD OF PRODUCING CARBONACEOUS BLOCKS IN A TUNNEL TYPE FURNACE

摘要

A method of producing carbonaceous blocks, and more particularly a method of manufacturing anodes for the electrolytic 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 contacting at least part of the external surfaces of the coated bodies such that as the blocks reach a temperature of 200600.degree.C at which they release volatile organic substances, the oxidizing atmosphere has a temperature of at least 550.degree.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.degree.C.