RECYCLING METHOD OF WASTE SULFURIC ACID ETCHING SOLUTION WASTE CHLORIC ACID ETCHING SOLUTION AND WASTE NITRIC ACID ETCHING SOLUTION

摘要

PURPOSE: A recycling method of waste sulfuric acid etching solution, waste hydrochloric acid etching solution and waste nitric acid etching solution is provided which is environmental friendly and recycles aluminum sulfate water treatment coagulant, hydrochloric acid and nitric acid to a high purity from the solutions. CONSTITUTION: The recycling method comprises a step (a) of recovering hydrochloric acid by vacuum evaporating a mixed solution of waste sulfuric acid etching solution including aluminum and waste hydrochloric acid etching solution including aluminum; a step (b) of further adding aluminum to the waste sulfuric acid etching solution including aluminum after vacuum evaporation; a step (c) of preparing a mixed solution thereof by adding waste nitric acid etching solution to the waste sulfuric acid etching solution to which aluminum is added; and a step (d) of separating nitric acid and aluminum sulfate water treatment coagulant from the mixed solution by replacing, purifying and vacuum evaporating the mixed solution, wherein aluminum of the step (b) is waste aluminum chip.