ELECTROLYSIS UNIT FOR ALUMINIUM MANUFACTURE Russian patent published in 2012 - IPC C25C3/08 

FIELD: electricity.

SUBSTANCE: electrolysis unit consists of the following: cathode device including pit with carbon bottom, the pit is formed by carbon blocks enclosed in metallic casing with flame proof and heat-insulating materials arranged between metallic casing and carbon blocks; anode device including carbon anodes connected to anode bus, the anodes are arranged in upper part of bath and absorbed in fused electrolyte; and point feeding system (PFS) including punch pin for electrolytic crust and alumina feeder. On carbon bottom under each PFS feeder there are units installed resistant to destruction in cryolite-alumina melt and molten aluminium. Upper base of unit is located at level and above level of molten aluminium not exceeding 2 cm. Units may be made from carbon or from silicon carbide, or from mixture of titanium diboride and aluminium oxide on high-temperature connection. Inserts from heavy material, such as cast iron, may be mounted inside units. Relation of squares of upper and lower bases of units changes from 1:1 to 1:2. Square value of upper basis of unit is chosen considering quantity of alumina loaded by dosemeter - from 30 to 80% - falling on it. Units may be covered by titanium diboride. Upper basis of units may be flat or convex, or inbent.

EFFECT: increasing completeness of alumina solution and reducing its quantity getting under molten metal layer.

10 cl, 1 dwg