METHOD FOR TREATING COPPER CHLORIDE-CONTAINING WASTE ETCHING SOLUTION, TREATING AGENT AND METHOD FOR RECOVERING COPPER

摘要

PROBLEM TO BE SOLVED: To provide a method for efficiently treating a copper chloride- containing waste etching solution with a reduced amount of sludge generated. SOLUTION: In the method for treating a copper chloride-containing waste etching solution, the pH of the solution to be treated is adjusted to the range of 5-14 in the presence of (i) phosphate ions, (ii) calcium ions, (iii) iron ions and (iv) a carboxyl-containing hydrophilic high polymer and/or its hydrolyzate and dissolved copper ions are precipitated as a slightly soluble material.