Fully closed system for regenerating alkaline etching liquid and recovering copper in PCB
A recovery system and alkali etching technology, applied in the field of regeneration system, can solve the problems of reducing the etching line speed and quality, the etching solution must be completely replaced, and the impact of etching solution regeneration and reuse, so as to save costs, speed and operating costs saving effect
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[0022] In one case, the amount of etching waste liquid from the alkaline etching production line was 3M 3 / Day, which is 90M 3 / Month, Cu 2+ The concentration is 140-150g / L, stored in a waste liquid tank, the waste liquid is pumped into the extraction tank through a pump, the pumping volume is 125L / h, the pumping volume of the extractant is 125L / h, the extraction tank is effective The volume is 125L. It adopts mechanical stirring and continuous operation, and the extraction time is 1h. The overflowing mixture is separated in a gravity tank. The volume of the gravity separation tank is 250L. It is made of plexiglass, and a microporous aeration head is installed in the separation tank. The extractant with a smaller specific gravity enters the back extraction mixing tank from above. The larger etching solution enters the fiber degreaser, and the copper ion concentration in the separated etching solution is 70 g / L.
[0023] The separated etching solution is introduced into the origin...
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