Electrolytic cell for acidic etching liquid in-situ regeneration technology

Abstract

The invention discloses an electrolytic cell for acidic etching liquid in-situ regeneration technology. The structure of the electrolytic cell comprises a current collector, an expanded graphite current collector, an anode chamber, an anode chamber insulated grid plate, an anion exchange membrane, a cathode chamber insulated grid plate and a cathode chamber; the anode chamber is internally provided with a baffle plate and a porous electrode; the anion exchange membrane adopts AMI-7001 type anion membrane; and the cathode chamber is provided with a baffle plate and a plugged copper plate electrode. Compared with the existing electrolytic cell, the electrolytic cell disclosed by the invention has the characteristics of being simple in structure and convenient to install and expand; and no chlorine gas is generated without polluting the environment since the anode potential is low in the electrolytic process. In the application process, the cell voltage is only 2-2.5V, the current efficiency is high, the energy-saving effect is obvious, and the energy consumption of copper recycle is reduced.

Description

technical field [0001] The invention relates to an electrolytic cell used in the in-situ regeneration process of acidic etching liquid, which belongs to the electrolytic technology for treating waste acidic etching liquid. Background technique [0002] The regeneration and recovery of acidic etching solution has always been an important issue in the PCB production industry. At present, most enterprises still use chemical methods to regenerate and recycle acidic etching waste. The main technical route of chemical regeneration and recovery is to add an oxidant to a part of the etching waste liquid to decompose the Cu in it. + Oxidized to Cu 2+ At the same time, add some other chemical reagents to prepare an etching solution that meets the production requirements; another part of the etching waste solution is sent to a specific factory as a production waste solution, and is chemically converted to CuSO 4 or CuO to recover the copper therein. Although this method is easy ...

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Problems solved by technology

However, the operating voltage is relatively high (6V-8V), and hydrogen and chlorine are easily precipitated

The electrochemical regeneration method reported by Zeng Zhenou in 2010 can avoid the precipitation of chlorine gas when operating at low current density, but the anode uses Ir-Ta electrode, which is costly

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