A REUSING METHOD OF WASTE CHLORIC ACID BY ETCHING PROCESS AS ETCHING SOLUTION AND ALUMINUM POLYCHLORIDE COAGULANT

摘要

PURPOSE: A method for reusing a waste etching solution containing hydrochloric acid with an etching solution and a polyaluminum chloride water treatment coagulant is provided to reduce a cost required to the treatment of waste acid, to reuse waste material, to solve a problem of sludge reclamation. CONSTITUTION: The method for reusing a waste etching solution containing hydrochloric acid comprises: heating and dissolving aluminum in the waste etching solution such that the density of aluminum is 60 to 80g/l; dissolving the waste etching solution containing the aluminum and the hydrochloric acid generated from an etching process of an aluminum foil by controlling both flow rates of the metallic waste solution and the withdrawn acid in a range of 600 to 1000ml/m¬2hr; and adjusting a density of hydrochloric acid into 50 to 80g/l and a density of aluminum chloride into 60 to 80g/l.