Method for treating zinc-containing electroplating wastewater and recovering zinc by electrolysis
A technology for electrolytic treatment and electroplating wastewater, applied in metallurgical wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of low removal rate, difficult control, complex process, etc., and achieve the goal of reducing the side reaction of electrolysis hydrogen Effect
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Embodiment 1
[0028] Refer to attached figure 1 , a method for electrolytically treating zinc-containing electroplating wastewater and recovering zinc. The electrolytic treatment of zinc-containing electroplating wastewater is carried out through an electrolytic treatment of zinc-containing electroplating wastewater. The electrolytic treatment of zinc-containing electroplating wastewater includes an electrolytic cell 1 and an electrolyte stirring device. The electrolytic cell 1 adopts a glass electrolytic cell, the anode 3 adopts a titanium-based platinum electrode, and the cathode 4 adopts a zinc electrode. The anode 3 and the cathode 4 are arranged alternately in a unipolar parallel manner, and the top of the electrolytic cell 1 is provided with an exhaust port 5 and a feed port 7. A valve is provided on the feed port 7, a pH meter 6 is provided in the electrolytic cell 1, a discharge port 8 is provided at the bottom of the electrolytic cell 1, and a valve is provided on the discharge port...
Embodiment 2
[0031] Refer to attached figure 1 , The electrolytic treatment of zinc-containing electroplating wastewater device for electrolytic purification of zinc-containing ion electroplating wastewater is the same as in Example 1. The method for electrolytic treatment of zinc-containing electroplating wastewater is: the electroplating wastewater with a zinc concentration of 150.0 mg / L enters the electrolytic cell 1 through the feed port 7 as the electrolyte 2, and an appropriate amount of Na is added to the electrolyte 2 2 C O 3 solution to adjust the pH value of the electroplating wastewater to 6.0, and the distance between the anode 3 and the cathode 4 is 20 mm. During electrolysis, through 15V DC, Na 2 CO 3 Add the solution into the pH adjustment tank 9 of the electrolyte stirring device, and slowly add 5 mol / L Na 2 CO 3 The solution makes the pH value of the electroplating wastewater reach 6.8, and the electrolysis time is 4 hours; in the electrolysis process, the interval ti...
Embodiment 3
[0033] Refer to attached figure 1 , The electrolytic treatment device for electrolytic treatment of zinc-containing electroplating wastewater is basically the same as that of Example 1, wherein the cathode 4 uses a graphite electrode. The method for electrolytic treatment of zinc-containing electroplating wastewater is: the electroplating wastewater with a zinc concentration of 150.0 mg / L enters the electrolytic cell 1 through the feed port 7 as the electrolyte 2, and an appropriate amount of Na is added to the electrolyte 2 2 CO 3 The solution adjusts the pH value of the electroplating wastewater to 6.1, and the distance between the anode 3 and the cathode 4 is 22mm; during electrolysis, 10V direct current is passed, and Na 2 CO 3 Add the solution into the pH adjustment tank 9 of the electrolyte stirring device, and slowly add 5 mol / L Na 2 CO 3 The solution makes the pH value of the electroplating wastewater reach 7.0, and the electrolysis time is 2 hours; in the electrol...
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