Patent ID: 8206560

Claim:
An aluminum electrolytic cell having heterotypic structured cathode carbon blocks, comprising: a cell case, a carbon anode, a bottom carbon internal lining, and refractory and heat insulating materials provided between the bottom carbon internal lining and the cell case, the bottom carbon internal lining being composed of a plurality of cathode carbon blocks, wherein a longitudinal direction of the cathode carbon block is perpendicular to a longitudinal direction of the cell case, wherein each cathode carbon block comprises a connecting part at a bottom end of the cathode carbon block and a protruding part at a top end of the cathode carbon block, the connecting part being formed integrally with the protruding part, wherein the connecting parts of the adjacent cathode carbon blocks are connected by tamping carbon pastes, wherein grooves extending in the longitudinal direction of the cathode carbon block are formed between the adjacent protruding parts of the adjacent cathode carbon blocks, wherein each protruding part of the cathode carbon block comprises 2-8 protruding portions which are arranged at a predetermined interval in the longitudinal direction of the cathode carbon block to form between adjacent protruding portions a slot extending in the longitudinal direction of the cell case, and wherein a height of molten aluminum within the electrolytic cell from the upper surfaces of the protruding portions is about 30-200 mm after the aluminum is generated.