Method for preparing novel anode material for non-ferrous metal electrodeposition

Abstract

The invention discloses a method for preparing an anode material for non-ferrous metal electrodeposition. The invention is characterized in that: the anode material is prepared from the following materials in percentage by weight: 0.1 to 0.2 percent of silver, 0.05 to 0.1 percent of cobalt, 0.1 to 0.5 percent of tin, 0.05 to 0.09 percent of calcium, 0.1 to 1 percent of stibium and the balance of lead. The method comprises the following steps of: melting the lead, and adding a silver-cobalt intermediate alloy containing 0.1 to 0.2 percent of silver and a tin-cobalt intermediate alloy; melting, adding a lead-calcium intermediate alloy, an antimony block and the residual lead, stirring for at least 10 minutes, standing for 5 minutes, descumming, casting into an alloy plate blank; and cooling, rolling, performing surface treatment on a lead alloy plate, leveling, and shearing the plate into alloy anodes with required size. The prepared anode has good mechanical properties and corrosion resistance, and can greatly reduce cell voltage and energy consumption in the electrolysis process in the electrometallurgy process of wet electrodeposition of zinc, copper, nickel and the like.

Description

technical field [0001] The invention relates to a preparation method of an anode material for electrowinning of nonferrous metals. Background technique [0002] In the whole industrial production, the metallurgical industry is still a big energy consumer, with high production energy consumption, and its main unit energy consumption is 40% higher than the foreign advanced level on average. In the smelting process of non-ferrous metals, more than 80% of zinc is extracted by hydrometallurgical technology. In the hydrometallurgy process, the electrowinning process consumes 2 / 3 of the energy consumption of the entire zinc extraction process, and the production energy consumption of hydrometallurgy zinc is 3800-4200kwh / t.Zn, with an annual output of 5 million tons nationwide in 2007 According to zinc meter, the power consumption is 20.3 billion kwh, accounting for 0.64-0.75% of the total industrial power consumption in the country. Especially in the current global economic depre...

AI Technical Summary

Problems solved by technology

However, in these electrodes, metal platinum and its alloys are expensive, and consume significantly when used at high current densities; lead oxide electrodes are difficult to manufacture, and the coating is prone to pitting corrosion, which makes the corrosion resistance poor; titanium-based surface coating Noble metal or its oxide, this kind of anode has the following disadvantages: (1) the cost of the electrode is high, (2) the life is short, the reason is due to the dissolution of the noble metal coating and the disintegration of the matrix titanium in the electrolytic production. It can be prevented by covering the intermediate coating, but it cannot fundamentally solve the problem. (3) In the electrowinning solution, impurity ions (Mn 2+ ) deposition on the anode in the oxide state after oxidation reduces the effect of coating precious metals

However, the melting point of cobalt in the lead melt is very small. According to the determination of H.Schenck, the cobalt content in the lead-rich liquid phase at 1550°C is only 0.33%, which greatly limits its application.