Alkaline etching solution circulation regeneration system and method thereof

Abstract

The invention discloses an alkaline etching solution circulation regeneration method. The method comprises the following steps that (1) etching waste liquid is produced; (2) extracting is conducted, the etching waste liquid is mixed with an extraction agent, copper ions are separated from the etching waste liquid, a copper-loaded oil phase is formed, and regeneration liquid is stored in a regeneration liquid barrel; (3) components are adjust, and tests of Cu<2+>, NH4<+>, Cl<-> and PH value are conducted on the regeneration liquid, amount of ammonia and ammonium chloride needed to be added is determined according to the test results so as to make the regeneration liquid flow back to an etching production line; (4) first water washing is carried out, and the copper-loaded oil phase is subjected to the first water washing to separate a aqueous phase from the copper-loaded oil phase; (5) back extracting is conducted, the copper-loaded oil phase is transferred into back-extraction liquid, the loaded extraction agent in the copper-loaded oil phase contact with and reacts with H2SO4 solution, so that the copper ions are separated from the extraction agent, and a CuSO4 solution is generated to enter the aqueous phase; and (6) electrodeposition is conducted, the CuSO4 solution is added into an electrolyte, the CuSO4 solution is subjected to electrolysis by the electrolyte, crude copperis deposited by a cathode, the anode generates oxygen, and the CuSO4 solution after electrodeposition is returned to 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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