Fluorine-resistant lead-based composite anode for zinc electrowinning and preparation method thereof
A composite anode and zinc electrowinning technology, applied in electrodes, electrolytic components, electrolytic processes, etc., can solve problems such as unsatisfactory corrosion resistance, and achieve the effects of improving protection, improving stability, and slowing down corrosion
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Embodiment 1
[0020] The pure Pb plate was used as the electrode, and the electrolyte composition was 5 g / L CaO, 1.0 mol / L Pb 2+ , 10 g / L MnO 2 , pH = 8, stirring speed 1500 r / min, electrolyte temperature 35 ℃, constant potential (2.0 V vs. Hg / Hg 2 SO 4 ) deposition for 50min to obtain Pb / CaO-MnO 2 -PbO 2 Composite anode, the CaO particle size in the composite anode film layer is 50 nm, the CaO particle content is 2 wt.%; MnO 2 Particle size 100 μm, MnO 2 Particle content 5 wt.%, MnO 2 The particles are diffusely distributed in the film layer, and the anode is in H containing 100 mg / L fluorine 2 SO 4 Constant current polarization in (160 g / L) solution (500 A m -2 ) After 72h, the substrate corrosion morphology compared with Pb / PbO 2 The anode corrosion hole is reduced by 50%, and the average corrosion hole diameter is reduced by 70%.
Embodiment 2
[0022] The Pb-Ag plate was used as the electrode, and the electrolyte composition was 10 g / L CaO, 0.5 mol / L Pb 2+ , 5 g / L MnO 2 , pH = 10, stirring speed 800 r / min, electrolyte temperature 55 ℃, current density 50 mA cm -2 Deposited under the conditions for 15 min to obtain Pb / CaO-MnO 2 -PbO 2 Composite anode, the CaO particle size in the composite anode film layer is 100 μm, and the CaO particle content is 8wt.%; MnO 2 Particle size 100 nm, MnO 2 Particle content 20 wt.%, MnO 2The particles are diffusely distributed in the film layer, and the anode is heated in H containing 200 mg / L fluorine 2 SO 4 Constant current polarization in (160 g / L) solution (500 A m -2 ) After 72h, the substrate corrosion morphology compared with Pb / PbO 2 The anode corrosion hole is reduced by 70%, and the average corrosion hole diameter is reduced by 80%.
Embodiment 3
[0024] The Pb-Ag-Ca plate was used as the electrode, and the electrolyte composition was 7 g / L CaO, 2 mol / L Pb 2+ , 18 g / L MnO 2 , pH = 9, stirring speed 2000 r / min, electrolyte temperature 40 ℃, constant potential (2.7 V vs. Hg / Hg 2 SO 4 ) for 40 min to obtain Pb / CaO-MnO 2 -PbO 2 Composite anode, the CaO particle size in the composite anode film layer is 1 μm, and the CaO particle content is 10 wt.%; MnO 2 Particle size 50 nm, MnO 2 Particle content 28 wt.%, MnO 2 The particles are diffusely distributed in the film layer, and the anode is in H containing 120 mg / L fluorine 2 SO 4 Constant current polarization in (160 g / L) solution (500 A m -2 ) After 9 days, the substrate corrosion morphology compared with Pb / PbO 2 The anode corrosion hole is reduced by 55%, the average corrosion hole diameter is reduced by 65%, and the corrosion depth is reduced by 60%.
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