METHOD FOR OBTAINING MATERIAL BASED ON THERMAL EXPANDED GRAPHITE (VERSIONS) Russian patent published in 2008 - IPC C01B31/04 

FIELD: chemistry.

SUBSTANCE: group of inventions can be used when making anode paste for aluminium electrolysis units. Oxidised graphite is saturated with solution, containing modifying additive in form of colloid solution of aluminium metahydroxide. An alternative is to saturate graphite with a water solution of an aluminium salt, chosen from a group, consisting of aluminium nitrate, chloride and sulphate. The aluminium metahydroxide is then precipitated at 70-90°C by adding an aqua ammonia solution in quantity, sufficient for attaining pH of 8-9. The mass ratio of the oxidised graphite to the solution of the modifying additive is 1:(1-2). The mass ratio of thermal expanded graphite to the solution of the modifying additive is 1:(50-100). The solid medium is separated from the particulate, dried and undergoes thermal processing at 300-850°C. The obtained material based on thermal expanded graphite contains 1-30 wt % γ - Al₂O₃ and particles of thermal expanded graphite constitute the remaining wt %. The obtained material has better adsorption and catalytic activity.

EFFECT: obtaining material with improved adsorption and catalytic activity.

16 cl, 1 tbl, 9 ex