Method for electrolyzing high-content low-grade lead bullion

Abstract

The invention relates to a method for electrolyzing high-content low-grade lead bullion. The method comprises the following steps of melting the high-content low-grade lead bullion containing copper, antimony and bismuth into a pot to be stirred for removing the copper, thoroughly removing the copper-containing floating slag, adding alkali to remove arsenic and tin, pumping the lead liquid into an anode plate casting machine to be cast into an anode plate, reasonably matching the use amount of the combined additives to electrolyze the anode plate and the electrolyte according to the chemical components of the anode plate and the chemical components of the electrolyte, extracting cathode lead, washing the cathode lead with water to remove the electrolyte on the surface of the lead and thus obtaining the precipitated lead, casting the refined precipitated lead to obtain lead pig with the quality reaching the No.1 national standard, gathering the antimony, bismuth, copper, gold and silver onto the anode plate to form anode paste, and further comprehensively recovering the antimony, bismuth, copper, gold and silver in balance. By adopting the method, the lead bullion with high contents of copper, antimony and bismuth can be electrolyzed into the qualified precipitated lead in one step, so that the secondary electrolysis cost can be reduced, and the enriched metal grade in the anode paste can be improved.

Description

technical field [0001] The invention relates to a method for smelting nonferrous metals, in particular to an electrolysis method for high-enrichment and low-grade crude lead. Background technique [0002] The purity of crude lead produced by crude lead smelting is in the range of 96%-99%, and the remaining 1%-4% is precious metals such as gold, silver, selenium, tellurium and other rare metals and impurities such as copper, nickel, selenium, antimony and bismuth. The value of precious metals sometimes exceeds the value of lead and must be extracted, while the impurity components have a harmful effect on the ductility and corrosion resistance of lead and must be removed, so crude lead must be refined. [0003] There are two types of crude lead refining: fire refining and electrolytic refining. Lead smelters in China and Japan generally use electrolytic refining, while other countries in the world use fire refining. The fire refining equipment and process are simple, the const...

AI Technical Summary

Problems solved by technology

[0008] The electrode potentials of bismuth and lead in crude lead are relatively close. When the bismuth content in the anode plate is high, the grade of the precipitated lead Bi obtained by electrolysis exceeds the requirements of the national standard 1# lead ingot, and it is necessary to match a part of the precipitated lead with low-grade Bi content. Melting and casting in a lead melting pot can meet the requirements of the national standard 1# lead ingot. Due to the high content of lead concentrate, the content of the crude lead obtained after fire refining cannot meet the production needs, or the electrolysis effect is not ideal. , resulting in the precipitated lead grade failing to meet the national standard requirements, leading to production stagnation and seriously affecting industrial production

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