Method for treating nickel-containing electroplating wastewater and recovering nickel 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 problems such as difficult control, complicated process, secondary pollution, etc. The effect of the reaction
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Embodiment 1
[0035] Refer to attached figure 1, a method for electrolytically treating nickel-containing electroplating wastewater and recovering nickel. The electrolytic treatment of nickel-containing electroplating wastewater is carried out through an electrolytic treatment device for nickel-containing electroplating wastewater. The electrolytic treatment device for nickel-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 nickel 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 pro...
Embodiment 2
[0038] Refer to attached figure 1 , The electrolytic treatment device for electrolytic treatment of nickel-containing electroplating wastewater is the same as in Example 1.
[0039] The method for electrolytic treatment of nickel-containing electroplating wastewater is: the electroplating wastewater with a nickel concentration of 100.0 mg / L enters the electrolytic cell 1 through the feed port 7 as the electrolyte 2, and an appropriate amount of Ca(OH) is added to the electrolyte 2 2 The solution adjusts the pH value of the electroplating wastewater to 6.5, and the distance between the anode 3 and the cathode 4 is 20mm; during electrolysis, 10V direct current is passed, and Ca(OH) 2 Add the solution into the pH adjustment tank 9 of the electrolyte stirring device, and slowly add 0.1mol / L Ca(OH) under the anode 3 through the outlet hole 12 on the infusion tube 11 of the electrolyte stirring device 2 The solution makes the pH value of the electroplating wastewater reach 6.9, and...
Embodiment 3
[0041] Refer to attached figure 1 , The electrolytic treatment device for electrolytic treatment of nickel-containing electroplating wastewater is basically the same as Example 1, wherein the cathode 4 uses a graphite electrode. The method for electrolytic treatment of nickel-containing electroplating wastewater is: the electroplating wastewater with a nickel concentration of 100.0 mg / L enters the electrolytic cell 1 through the feed port 7 as the electrolyte 2, and an appropriate amount of NaOH solution is added to the electrolyte 2 to reduce the electroplating wastewater. The pH value is adjusted to 6.9, and the distance between the anode 3 and the cathode 4 is 15mm; during electrolysis, 8V direct current is applied, and the NaOH solution is added to the pH adjustment tank 9 of the electrolyte stirring device, and the infusion tube 11 of the electrolyte stirring device is passed The liquid outlet hole 12, slowly add 1mol / L NaOH solution under the anode 3 to make the pH value...
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