Copper, nickel and chromium-containing ferric chloride etching solution regeneration and reusing device and method

Abstract

The invention discloses a copper, nickel and chromium-containing ferric chloride etching solution regeneration and reusing device and method. The device comprises an etching machine, a waste liquor collection tank, a waste liquor storage tank, an ion film electrolyser and a circulating tank. The ion film electrolyser comprises an anode area and a cathode area. The circulating tank comprises an anode circulating tank and a cathode circulating tank. Anode liquor and cathode liquor which are electrolyzed in the ion film electrolyser flow into the anode circulating tank and the cathode circulating tank correspondingly. The anode liquor in the anode circulating tank is pumped into the etching machine by a first high-pressure pump. The cathode liquor in the cathode circulating tank is subjected to temperature regulation and then is pumped into the cathode area of the ion film electrolyser by a second high-pressure pump to form a cycle. The process is an online regeneration process. The concentrations of copper, nickel and chromium ions of the regenerated ferric chloride etching solution are reduced. The oxidation-reduction potential meets the requirement. The regenerated ferric chloride etching solution can be cyclically used. Recycled copper, nickel and chromium alloy can be sold directly. Economic benefits are remarkable.

Description

technical field [0001] The invention relates to the technology in the field of environmental protection, in particular to a device and method for regenerating and recycling ferric chloride etching solution containing copper, nickel and chromium. Background technique [0002] The ferric chloride wastewater discharged from the cleaning section of the etching machine production line of PCB and electroplating enterprises contains a large amount of copper, nickel, chromium, etc. During sewage discharge, ferric chloride wastewater is generally mixed with wastewater containing metal elements such as gold and tin, and then discharged to the sewage treatment tank together, and a general-purpose precipitation reagent is added to the treatment tank for preliminary chemical reactions to make some metal elements After simple recycling, the sewage is discharged. The above simple sewage treatment method has a very low recycling rate of metal elements. In addition, the mixed solution of va...

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Problems solved by technology

The above simple sewage treatment method has a very low recycling rate of metal elements. In addition, the mixed liquid of various metals is mixed and discharged before sewage treatment, which is not targeted, resulting in high sewage treatment costs.

In addition, the current national sewage discharge has limited discharge standards for copper, nickel, and chromium elements. If the above-mentioned simple sewage treatment discharges, it generally cannot meet the national discharge standards for copper, nickel, and chromium-containing wastewater that are difficult to treat.

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