Alkaline etching solution recycling regeneration system and method thereof

Abstract

The invention discloses an alkaline etching solution recycling regeneration method. The alkaline etching solution recycling regeneration method comprises the following steps that (1) an etching wastesolution is produced; (2) extraction is carried out, specifically, the etching waste solution is mixed with an extraction agent, copper ions are separated from the etching waste solution to form a loaded copper oil phase, and a regenerated solution is stored in a regenerated solution bucket; (3) component adjustment is carried out, specifically, Cu2+, NH4+, Cl- and PH value are assayed for the regenerated solution, the amount of ammonia and ammonium chloride to be added is determined by the assayed results, and then the regenerated solution flows back to an etching production line; (4) primarywashing is carried out, specifically, primary washing is carried out on the loaded copper oil phase, and an aqueous phase is separated from the loaded copper oil phase; (5) back extraction is carriedout, specifically, the loaded copper oil phase is transferred into a back extraction solution, and a loaded extractant in the loaded copper oil phase has a contact reaction with a H2SO4 solution, thecopper ions are separated from the extractant, and a CuSO4 solution is formed and enters the aqueous phase; (6) an electrodeposition is carried out, specifically, the CuSO4 solution is added to an electrolyte, the CuSO4 solution is electrolyzed by the electrolyte, the coarse copper is deposited at a cathode, oxygen is generated at an anode, and after the CuSO4 solution is electrodeposited, the solution flows back into a back extraction cylinder.

Description

technical field [0001] The invention relates to the technical field of etching, in particular to an alkaline etching solution circulation regeneration system and a method thereof. Background technique [0002] In the past 20 years, China's PCB industry has maintained an annual growth rate of 10-00%. At present, there are more than 3,500 PCB companies of various sizes, with a monthly output of 120 million square meters. Etching is a process that consumes a large amount of chemicals and water in PCB production, and it is also the process that produces the largest amount of waste liquid and wastewater. Generally speaking, about 2-3 liters of etching solution is consumed for each square meter of double-sided panels with a normal thickness (18 μm), and Generate 2-3 liters of waste etching solution. my country's PCB industry consumes more than 60,000 tons of refined copper per month, and the total amount of copper in the copper etching waste liquid produced is more than 50,000 to...

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Problems solved by technology

[0006] Therefore, related technologies for the recycling and utilization of waste etching liquid have appeared on the market. However, the current technology still has the phenomenon of waste liquid discharge in each process, and it cannot achieve the effect of complete recycling and zero discharge of the entire system.

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