METHOD FOR ACTIVATING DETERIORATED WASTE ALKALINE DEGREASING SOLUTION OR ALKALINE ELECTROLYTIC DEGREASING SOLUTION

摘要

PURPOSE:To separate oil in the deteriorated waste degreasing soln. and to restore the degreasing capacity by charging the deteriorated waste alkaline degreasing soln. or alkaline electrolytic degreasing soln. used in the metal surface treatment such as plating into a separatory funnel and allowing the soln. to stand. CONSTITUTION:When the surface of a metal is treated by plating, etc., the surface is degreased and cleaned by an alkaline degreasing soln. contg. NaOH, Na2CO3, Na2SiO3, etc., or an alkaline electrolytic degreasing soln. The deteriorated waste alkaline degreasing soln. used in degreasing, contg. oil and with the degreasing capacity deteriorated is charged into a transparent cylindrical funnel 1 and allowed to stand for 24-48hr, for example, at room temp. or a low temp. below room temp. The contained oil is floated up on the liq. surface in the funnel 1 when the soln. is used in cathodic degreasing or dip degreasing or settled at the bottom of the funnel 1 when used in anodic degreasing, the oil is separated and removed by opening a valve 2, and a regenerated alkaline degreasing soln. or alkaline electrostatic degreasing soln. is recovered.