Light composite electro-catalysis energy-saving anode for non-ferrous metal electro-deposition and preparation method thereof

Abstract

The invention relates to a light composite electro-catalysis energy-saving anode for non-ferrous metal electro-deposition, which is composed of a metal substrate, an interlayer and a composite electro-catalysis superficial layer in sequence from inside to outside, wherein the metal substrate is Al or Al base alloy (Al-M1), the interlayer is a composite layer Al2O3-(Pb-M2) composed of Al2O3 or Pb base alloy, and the composite electro-catalysis superficial layer is a composite deposite (Pb-M2)-M3Ox composed of Pb or Pb base alloy and oxide catalyst or a composite deposite PbO2-M3Ox composed of PbO2 and oxide catalyst. The preparation method of the anode comprises the following steps: preparation of the metal substrate: carrying out anodic oxidation on the metal substrate surface and prefabricating a multihole Al2O3 layer; then performing an electro-deposition Pb or Pb base alloy layer on the multihole Al2O3 layer; and plating a (Pb-M2)-M3Ox or PbO2-M3Ox composite superficial layer on the surface of the Pb or Pb base alloy layer. The anode prepared by the invention can effectively reduce production energy consumption, improve cathode product quality, lower labor intensity, is suitable for industrialized production and can replace the Pb base alloy anode applied in the existing industry.

Description

technical field [0001] The invention discloses a light-weight composite electrocatalytic energy-saving anode for nonferrous metal electrodeposition and a preparation method thereof, and relates to the technical fields of nonferrous metal smelting, composite materials, molten salt chemistry, electrochemistry, chemical industry and metal surface treatment. Background technique [0002] In 2008, the total output of ten kinds of nonferrous metals in my country exceeded 25.2 million tons, and the total consumption was 25.17 million tons. Although the total output in 2009 declined slightly, it still maintained the momentum of ranking first in the world for many years. Compared with pyro-smelting, the hydro-smelting process has the advantages of large production capacity, high efficiency, good operating conditions, low environmental pollution, and high comprehensive recovery rate of valuable metals. It is one of the main development directions of the non-ferrous smelting industry to...

AI Technical Summary

Problems solved by technology

In addition, the Pb-based alloy anode also has the following problems: ①Ag needs to be added to the anode, which makes the anode preparation cost high; ②Pb-based alloy anode has high density, low strength, and is easy to bend and creep, which causes short circuit, reduces current efficiency, and increases energy efficiency. consumption; ③PbO of Pb-based alloy anode 2 The passivation film is loose and porous, and the corrosion of the Pb matrix and the shedding of the anode slime during the electrolysis process not only make the anode corrode quickly and the unit consumption is high, but also cause the cathode product Zn to be polluted by Pb

Studies have shown that this type of anode can greatly reduce the oxygen evolution potential, reduce the corrosion rate, and increase the current efficiency in the initial stage of electrolysis. However, in the long-term electrolysis experiment, it is found that each anode will show different degrees of failure. The life of the anode is short, especially the electrodeposited composite coating on the surface of the Al substrate, because it is usually achieved after coating the Al surface with a conductive coating or galvanizing, so that the active electrocatalytic coating of the anode is mechanically isolated from the substrate, and both The combination is poor, which seriously affects the service life, which has also become a major bottleneck restricting its development

Images