(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083；2. 河南豫光鋅業(yè)有限公司，濟(jì)源 464530)
摘 要: 采用復(fù)合電鍍技術(shù)制備Pb/Pb-MnO2復(fù)合電催化陽極，研究MnO2微粒晶型與粒徑、電極構(gòu)置、施鍍時間和添加劑等對鍍層中微粒含量的影響，利用正交實(shí)驗(yàn)確定陽極制備的最優(yōu)條件，運(yùn)用循環(huán)伏安和恒流極化等手段對復(fù)合陽極的析氧電催化性能進(jìn)行評價。結(jié)果表明：通過工藝優(yōu)化，可在氟硼酸鹽鍍鉛體系中實(shí)現(xiàn)Pb基體上Pb-MnO2復(fù)合鍍，獲得MnO2微粒含量為1%~10%(質(zhì)量分?jǐn)?shù))的復(fù)合鍍層；模擬工業(yè)鋅電積過程中，電解初始階段復(fù)合陽極電位相比鉛陽極降低約300 mV，經(jīng)過24 h電解后，其穩(wěn)定電位仍比鉛陽極低100 mV，與工業(yè)Pb-Ag(0.6%，質(zhì)量分?jǐn)?shù))陽極的穩(wěn)定電位相當(dāng)。
關(guān)鍵字: 鋅電積；復(fù)合電鍍；Pb/Pb-MnO2陽極；氟硼酸鹽體系；析氧電催化
zinc electrowinning
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. Henan Yuguang Zinc Industry Co., Ltd., Jiyuan 464530, China）
Abstract:A new type of Pb/Pb-MnO2 composite anode was prepared by composite electrodeposition, the effects of particle size and crystal of MnO2, electrodes configuration and electrodeposition time on the particles content in co-deposit were studied, and the optimum conditions of anode preparation were ascertained by orthogonal experiments. The electrocatalytic activity for oxygen evolution reaction (OER) of the composite anode was evaluated by cyclic voltammetry (CV) and galvanostatic polarization method. The results indicate that Pb/Pb-MnO2 composite deposit containing 1%~10% (mass fraction, %) MnO2 particles can be obtained in the fluoborate solution of lead plating. In the stimulant evaluation of industrial electrowinning, the composite anode prepared under the optimal conditions is about 300 mV, more active than the pure lead anode at the initial stage of electrolysis, and the stable potential after 24 h is 100 mV lower than that of pure lead anode, which is equal to that of Pb-Ag (0.6%) anode.
Key words: zinc electrowinning; composite electrodeposition; Pb/Pb-MnO2 anode; fluoborate system; oxygen evolution electrocatalysis
