Zero-emission apparatus and process for environmentally recovering acidic copper etching waste fluid

Abstract

The invention discloses a zero-emission apparatus for environmentally recovering an acidic copper etching waste fluid, comprising an etching machine used for online etching, a precipitation tank, a pneumatic filter press and a blending tank. The precipitation tank is separately connected with the etching machine and the pneumatic filter press, the pneumatic filter press is connected with the blending tank, and the blending tank is connected with the etching machine. A copper etching waste fluid pump is arranged between the etching machine and the precipitation tank, a pneumatic pump is arranged between the precipitation tank and the pneumatic filter press. A clear liquid pump is arranged between the pneumatic filter press and the blending tank, and a new etching liquid pump is arranged between the blending tank and the etching machine. The invention further discloses a process for environmentally recovering the acidic copper etching waste fluid. Copper ions in the acidic waste liquid are precipitated by adopting a chemical precipitation method, and a chloride ion concentration and a pH value in the solution is adjusted to remake the solution to an ammonium chloride etching liquid raw material. New wastewater or waste is not generated in the whole process, wastewater is treated from a source. The apparatus and the process is environmental and clean, short in the operation process, low in the equipment cost, small in the occupied area, and remarkable in the economic benefit.

Description

technical field [0001] The invention relates to the technical field of recycling copper-etching waste liquid, in particular to a zero-emission environmentally friendly recovery device and process for acidic copper-etching waste liquid. Background technique [0002] The acidic etching solution is composed of ammonium chloride and hydrochloric acid. When the etching machine is finished, the waste liquid is discharged. The composition of the waste liquid mainly contains 8% copper ions, 10% ammonia nitrogen ions, and 24% chloride ions. Such ingredients are generally collected uniformly by the environmental protection department and handled professionally. If it goes directly into rivers and lakes without treatment, it will damage the environment, destroy the ecological balance, and endanger human survival. Some manufacturers use the waste liquid to produce copper sulfate, but after the production of copper sulfate, the wastewater will increase sulfuric acid in addition to ammon...

AI Technical Summary

Problems solved by technology

Therefore, the existing treatment methods have their limitations, and have not met the environmental protection requirements of completely zero waste wastewater discharge.

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