Quenching anode effect by anode rocking

Details Quenching anode effect by anode rocking Quenching anode effect by anode rocking

C - Chemistry, Metallurgy

25

C

204/48

C25C 3/06 (2006.01) C25C 7/06 (2006.01)

Patent

CA 1148892

ABSTRACT A method of quenching anode effect when producing aluminium by electrolytic reduction, characterized in that the anode, when anode effect has started, is placed in an inclined position, so that the wearing surface forms an angle of up to 20 with the horizontal. This method is called anode rocking and has obvious advantages: 1) The surface of the bath remains at the same level. The bath will merely flow from the one end to the other. This can be advantageous for mixing of low and high alumina concentration in the bath. 2) The wearing face of the anode will be inclined, so that the gas and the gas film can more readily escape, 3) It is not necessary to make the cathode shells higher in order to contain the bath. 4) The energy consumption is kept down because the thermal insulation efficiency of the crust is not impaired by its being mixed with molten bath and alumina. 5) The loss of energy through molten bath flooding over the crust is avoided. 6) There is no spilling of bath onto the floor.

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