Method for recovering copper from acid waste etching solution

Abstract

The invention relates to a method for recovering copper from an acid waste etching solution. The method is characterized by comprising the following steps of: (1) preparing an organic phase by adopting an Lix series extraction agent with the volume ratio of 5-20% and 80-90% of kerosene or No. 200 solvent oil; (2) performing copper extraction by using the organic phase and the acid waste etching solution according to the volume ratio of (1-30): 1; (3) washing the loaded organic phase obtained in the step (2) and pure water according to the volume ratio of (0.1-10): 1; (4) performing back extraction by using the loaded organic phase after washing in the step (3) and a copper sulfate solution according to the volume ratio of (1-10): 1, and returning the organic phase after back extraction to the step (2) for reuse, wherein a water phase is the copper sulfate solution; and (5) performing copper electrodeposition on the copper sulfate solution obtained in the step (4), and returning the copper sulfate solution after copper electrodeposition to the step (4) for reuse. According to the method for recovering the copper from the acid waste etching solution, disclosed by the invention, the copper can be selectively separated from the acid waste etching solution, the process is simple and the separation effect is good.

Description

technical field [0001] The invention relates to a method for recovering copper from acidic waste etching solution. Background technique [0002] The production process of printed circuit board (PCB) is long, and the etching process is the largest part of the PCB production process. In the etching process, when the etchant has too many dissolved substances and the etching index, including speed, side erosion coefficient, surface cleanliness, etc., is lower than the process requirements, it becomes a waste etchant. Etching liquids include acidic etching liquids, alkaline etching liquids and micro etching liquids. Acid etching is mainly used in the production of inner layer circuit patterns of multilayer circuit boards. Generally speaking, every 1m produced 2 The circuit board needs to consume 2~2.5L of etching solution, and correspondingly produce 2~2.5L of waste etching solution. The concentration of copper ions is very high, reaching 120g / L or higher. The main components o...

AI Technical Summary

Problems solved by technology

The grade of sponge copper obtained by the replacement method is not high, and the copper content in the tail liquid after copper recovery is high. Although the copper powder produced by the electrolysis method has high purity and is better than the copper powder produced by other methods, the efficiency of the copper powder produced by the electrolysis method is higher than that of copper powder produced by other methods. Relatively low, high power consumption, and the concentration of heavy metal ions in the waste liquid cannot be reduced very low, strict treatment must be carried out before discharge, and the electrolysis method is easy to produce chlorine gas; neutralization precipitation method to treat copper-containing waste liquid, the process Simple, low investment, but the copper content of the mother liquor after copper sulfate crystallization is high, which needs further treatment, and the inorganic and organic substances such as ammonium salt in the wastewater cannot be recycled, causing serious environmental pollution