Composite anode material, preparation method of composite anode material, anode plate and preparation method of anode plate

Abstract

The invention provides a composite anode material. The composite anode material comprises a metal bar core, a metal layer, a conductive ceramic layer and an activate ceramic layer, wherein the metal bar core is coated with the metal layer, and the metal layer adopts lead or a lead alloy; the metal layer is coated with the conductive ceramic layer, and the conductive ceramic layer comprises beta-PbO2-Al2O3 composite oxide; and the conductive ceramic layer is coated with the activate ceramic layer, and the activate ceramic layer comprises gamma-MnO2-Ti4O7 composite oxide. Compared with the priorart, according to the composite anode material, the outermost layer of the anode composite material comprises the gamma-MnO2-Ti4O7 composite oxide, wherein the gamma-MnO2 has the low oxygen evolutionpotential, the catalytic activity and corrosion resistance of an electrode can be further improved due to doped titanium, and meanwhile the intermediate conductive ceramic layer beta-PbO2-Al2O3 composite oxide has the good corrosion resistance and conductivity, so that the service life of the anode composite is longer, and the lower cell voltage is provided.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a composite anode material and a preparation method thereof, an anode plate and a preparation method thereof. Background technique [0002] In the process of extracting zinc, copper, nickel, cobalt, manganese, chromium and other metals by hydrometallurgy, lead and lead alloys are still used as anode materials. The disadvantages are: high cell voltage (3.4-3.8V) and low current efficiency (75 ~ 88%), high energy consumption in the electrowinning process (3400 ~ 4200 degrees / ton of zinc), short service life of the anode (0.5 ~ 1 year), the anode lead is easily dissolved and enters the cathode product, resulting in a decline in the quality of the cathode product. In order to reduce the energy consumption of zinc, copper, nickel, cobalt, manganese, chromium and other electrolytic deposition and prevent the pollution of cathode products by anode lead. In-depth ...

AI Technical Summary

Problems solved by technology

[0002] In the process of extracting zinc, copper, nickel, cobalt, manganese, chromium and other metals by hydrometallurgy, lead and lead alloys are still used as anode materials. The disadvantages are: high cell voltage (3.4-3.8V) and low current efficiency (75 ~88%), high energy consumption in the electrowinning process (3400-4200 degrees / ton of zinc), short service life of the anode (0.5-1 year), easy dissolution of anode lead into the cathode product, resulting in a decline in the quality of the cathode product

But the PbO produced by electroplating in this way 2 As an insoluble anode, the electrode will have the following problems in use: a, PbO 2 The deposition layer is not tightly combined with the electrode surface or the deposition layer is uneven; b, PbO 2 The deposited layer is porous and rough, with large internal stress; c, PbO 2 The deposited layer is easy to peel off or corrode, and the lifespan is not long, but it is doped with fluorine-containing resin and (or) inactive particles of PbO 2 The electrode is used in hydrometallurgy with high cell voltage

[0006] (4) An anode obtained by mutual melting with light metal aluminum as the inner core and the outer lead alloy through molten salt electroless plating transition layer casting or electroplating: it also has some difficult problems to solve, one is that the lead alloy cannot be solved The fluidity of the liquid and the holes that may appear locally on the large-size anode plate; the second is that there will be some grain boundary gaps in the coating, and the oxygen generated during electrolysis passes through the grain boundary gaps of the coating to form an aluminum oxide matrix with poor conductivity. layer, deteriorating anode performance

Using cheap aluminum base as the substrate, the material cost is significantly reduced, but there are still problems such as high cell voltage, easy crystallization of the surface of the conductive beam and short circuit phenomenon, insulation sheath affecting the distribution of power lines, reducing the output of cathode products and short life.

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