Abstract: Aluminum smelting dust is leached with mineral acids such as sulfuric acid, hydrochloric acid and nitric acid. Oxidizing agents such as potassium permanganate, manganese dioxide, hydrogen peroxide, ozone, potassium chromate, potassium dichromate, ammonium persulfate, sodium hypochlorite, sodium chlorite and sodium chlorate are added to the leach solution. The addition of an oxidizing agent remarkably improves the gallium extraction.

Abstract: 5 to 50 wt. % of an alkaline flux such as sodium carbonate, sodium hydroxide, potassium carbonate and potassium hydroxide is added and mixed to aluminum smelting dust. The mixture is roasted, the roasted mixture is acid-leached with mineral acids such as sulfuric acid, hydrochloric acid and nitric acid, and then gallium is preferentially extracted at a high yield compared to other components of the dust.

Abstract: The present invention provides for the recovery of gallium from aluminum smelting dust. Aluminum smelting dust is leached with mineral acid, such as sulfuric acid, hydrochloric acid, or nitric acid. Gallium is extracted from the obtained leach liquor with an organic solution containing a liquid cation exchange agent. The resulting loaded organic solution is treated with mineral acid in aqueous solution, either after or before scrubbing with a higher concentration of acid in aqueous solution, to strip gallium. Gallium is extracted from this solution with another organic solution containing an ion-pair extracting type extracting agent. Finally, purified gallium is recovered by stripping the latter loaded organic solution with water or dilute acid in aqueous solution.

Abstract: Refinement of impure aluminum is accomplished by a method which comprises placing the impure aluminum in a molten form as an anode on one side of a porous article impregnated with a fused-salt electrolytic bath, disposing a cathode on the other side of the porous article, and passing direct current between the cathode and the anode.

Abstract: Disclosed herein is a process for producing aluminum by the steps of electrolyzing an electrolytic bath composed preponderantly of aluminum chloride while using a tungsten plate or a silicon carbide plate as the anode for thereby educing aluminum on the cathode, splitting the cathodic product of electrolysis from the cathode to produce in the electrolytic cell a muddy substance composed preponderantly of aluminum, collecting the muddy substance, then melting it to produce molten aluminum and cooling the molten aluminum.