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The copper electrowinning new lead-based alloy anode Preparation and properties of

Author: ZhouAiGuo
Tutor: GuoZhongCheng
School: Kunming University of Science and Technology
Course: Non-ferrous metallurgy
Keywords: Electrowinning copper Lead alloy anode Anodic polarization Cyclic voltammetry AC impedance
CLC: TF811
Type: Master's thesis
Year: 2010
Downloads: 60
Quote: 0
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Abstract


→ extraction → extraction → metal prepared hydrometallurgical process leaching at home and abroad has been rapid development in recent years, the electrowinning copper anode metallurgical researchers studied extensively. Factory using the Pb-Ca-Sn anode due to the calcium content of tin is high causes the anodic oxygen evolution potential increases, the corrosion resistance is poor, likely to cause the current efficiency decreases. Preparation of a Pb-Cu-Ca-Sn and Pb-Cu-Ca-Sn-Ce two series of lead alloy anode in order to improve the the lead anode corrosion resistance, electrochemical and mechanical properties, the present experiment. The alloy microstructure analysis and Brinell hardness test results show that: 1% copper or calcium alone serious segregation, tin, copper and calcium lead alloy dispersion can promote. The copper content is ≤ 0.3%, the hardness of the alloy becomes larger with increasing copper content. Cerium can refine the grains to improve the hardness of lead alloy, and can improve the dispersibility of the copper-lead alloy. And the cerium can promote copper lead alloy grain refining effect. The casting rolling Pb-Cu-Ca-Sn alloy hardness was 10.33-12.09HB, 10.55 ~ 12.37 HB, the hardness of the Pb-Cu-Ca-Sn-Ce-based alloy casting and rolling Bad 10.33 ~ 12.09 HB, 10.55 ~ 12.37 HB, casting and rolling a Pb-Ca-Sn alloy were 9.26HB hardness 895 HB. Rolling the hardness of the alloy increases, when the alloy without cerium, rolling promote recrystallization, so that the hardness of the alloy increases; when copper (content ≤ 0.3%) and cerium join, rolling the lead alloy effect play hardening. CuSO4-H2SO4 system, 45 ° C, the current density 1000A/m2 when accelerated corrosion experiments showed that: an increase of only copper or calcium in the middle of the worst alloy corrosion resistance, rolling Pb-0.06? -0.1% Cu-0.6% Sn -Ce anode best corrosion resistance (corrosion rate 3.3745gm-2h-1, than the rolling Pb-0.06? -0.6% Sn alloy corrosion rate 0.6505gm-2H-1). Cast alloy corrosion rate increases linearly with increasing copper content in the alloy. Cerium improves the corrosion resistance of cast alloys. Rolling Pb-0.06?-Cu-0.6% Sn alloys, corrosion resistance improved, while filling the Pb-0.06? -0.6% Sn alloy corrosion rate plus 0.1% Cu and Ce increases. Lead-based alloy anode polarization 0,1,24 h after 45 ℃, 45g/LC2, 180g / L H2804 solution linear sweep cyclic voltammetry, AC impedance test. The test results With the increase of the copper content in the lead alloy, lead alloy anode activity decreases and then increases the anode corrosion resistance significantly decreased with increasing copper content. Therefore, the copper content should not exceed 0.2% added in the alloy. Cerium and copper have a synergistic effect to improve the electrochemical performance of lead alloy. Experiments by electrodeposition of copper: copper reduces the cell voltage (0.01V), no significant effect of changes in the copper content of the cell voltage, current efficiency becomes larger with increasing copper content. Cerium significantly improve the current efficiency.

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > Heavy metals smelting > Copper
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