PROTECTIVE COMPOSITION, COMPOSITION MATERIAL ON ITS BASIS FOR SECONDARY COVERING OF CELL AND METHOD OF MATERIAL'S MANUFACTURING Russian patent published in 2009 - IPC C25C3/08 C25C3/22 

FIELD: metallurgy.

SUBSTANCE: invention relates to secondary covering of cells Soderberg cells for aluminium manufacturing. Protective composition for secondary covering of cell allows following composition, wt %: fluorine-apatite concentrate 80-95, Al(PO₃)₃ - the rest. Composition material for secondary covering of cell contains basis layer, implemented from perforated steel_; and at least one layer of mentioned protective composition. Manufacturing method of composite material for secondary covering of cell includes receiving of suspension, containing following components, wt %: Al(H₂PO₄)₃ - 5-30, fluorine-apatite concentrate - 50-65 and water - the rest, its application on the basis layer, implemented of perforate steel, and heat processing implementation at 100-150°C with receiving of composite material, herewith suspension is applied on layer of basis in the form of layer with thickness, equal or exceeding height of perforation teeth, on surface of composite material after suspension it is additionally applied layer of material, not prohibiting water evaporation, for instance, paper layer. It is provided life cycle increasing of secondary covering of cell by means of chemical stability increasing against effect of aggressive gaseous mediums in the temperature range from -20 up to +750°C.

EFFECT: life cycle increasing of cell secondary covering.

8 cl, 1 tbl, 1 ex