ALUMINIUM DROSS PROCESSING METHOD Russian patent published in 2015 - IPC C22B7/04 

FIELD: metallurgy.

SUBSTANCE: invention relates to secondary metallurgy, and namely to an aluminium dross processing method. The method involves crushing of aluminium dross, separation of metallic aluminium, mixing of the residue after separation of metallic aluminium with a component containing iron oxides, sintering, separation of oxide and salt constituents of a sinter for separation of the salt constituent of aluminium oxide, which is performed using the ascending current with a variable hydrodynamic mode in a pulse column operating in a closed cycle with a conical sedimentation tank; with that, the clarified solution of the sedimentation tank is returned to a column for creation of the ascending current, and a solid phase of lower unloading of the pulse column is subject to magnetic separation. As a component containing iron oxides there used are wastes of alumina production in the form of red mud; with that, ratio of aluminium dross to red mud is sustained within 1:1-5, and sintering is performed at the temperature of 800-900°C.

EFFECT: reduction of energy consumption and simultaneous utilisation of aluminium dross and red mud.

2 cl, 1 dwg, 3 tbl