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| Performance of FeCl3 Etching Solution Renewed by Ion-exchange Membrane Electrolysis |
| BAO Jiqing1, 2, SHEN Xiaofang2, XU Jie1, YU Tian1 |
1. School of Biological and Chemical Engineering, Jiaxing University, Jiaxing 314001, China;
2. School of Environmental and Safety Engineering, Changzhou University, Changzhou 213100, China |
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Abstract In order to recycle the etching solution, the waste FeCl3 etching solution of a plant was renewed by a process of ion-exchange membrane electrolysis. Then the performance of the renewed etching solution was evaluated in terms of the effect of etching time, temperature, concentration of the etching solution and the free acid content in the etching solution on the redox potential and the etching rate for etching solutions such as new etching solution, the online etching solution and renewed etching solution. The results showed that the renewed etching solution met the demands of the etching process. An optimal etching efficiency may be reached when the etchant contains 90% of the renewed etching solution and free acid concentration higher than 0.3 mol/L at etching temperatures within a range 50~60 ℃.
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Received: 14 June 2013
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