A REUSING METHOD OF WASTE SULFURIC ACID BY ETCHING PROCESS AS ETCHING SOLUTION AND ALUMINUM SULFATE COAGULANT

摘要

PURPOSE: A method for reusing a waste etching solution containing sulfuric acid by using an etching solution and an aluminum sulfate water treatment coagulant is provided to reduce a cost required to the water treatment of waste acid, and to reuse waste material. CONSTITUTION: The method for reusing a waste etching solution containing sulfuric acid comprises the steps of: dissolving an aluminum component in the waste etching solution containing the sulfuric acid and aluminum such that the density of aluminum in sulfuric acid is 30 to 50g/l; diffusing the waste etching solution generated from an etching process of an aluminum foil by controlling the flow rate of the waste solution at 600 to 1200ml/m¬2hr; and adjusting a density of the sulfuric acid into 300 to 450g/l, and a density of aluminum sulfate into 35 to 45g/l.