This invention is a method of recovering chlorhydric acid and copper sulfate from acid etching solution. The procedures are that (1) recovering chlorhydric acid. The acid etching waste solution is filled in acid resistant distillation plant, then concentrated sulfuric acid is added, then they are heated to boiling state and the chlorhydric acid is recovered through distillation, the concentration of the concentrated sulfuric acid is 98% or more than 98%. The adding on is more than 5-15% than that based on the theoretical value of copper ion fully reacted with sulfuric acid in the distillation. (2) Recovering copper sulfate. First, the residue in chlorhydric acid recovery is watering dissolved to thoroughly decompose the copper sulfate in the residue; the adding quantity of the water is 30-70% volume of acid etching waste solution. Secondly, copper sulfate is seed out through the changing of high temperature to low temperature; the temperature change is controlled between 40 to 60 degrees centigrade. Thirdly, copper sulfate is got after the copper sulfate crystalline is filtrated and washed. The simplest method is used to recover the useful resource in etching waste liquor in this invention. The technique equipment is simple, operation is convenient, and there is no environment pollution, so it has wide using value. |