METHOD FOR DECOMPOSING ALUMINUM NITRIDE IN ALUMINUM DROSS BY ADDING AQUEOUS SODIUM HYDROXIDE SOLUTION IN ALUMINUM DROSS

摘要

PROBLEM TO BE SOLVED: To inexpensively remove nitrogen included in aluminum dross generated during the production and regeneration of aluminum. SOLUTION: Calcium hydroxide or calcium oxide is mixed with an aluminum dross. Aluminum nitride in the aluminum dross is hydrolyzed and removed as ammonium gas by adding an aqueous sodium hydroxide solution.