Electrolyte and method for electrolyzing and refining crude lead

Abstract

The invention relates to electrolyte and a method for electrolyzing and refining crude lead, and belongs to the technical field of wet-process metallurgy. The electrolyte electrolyzing and refining crude lead is of a methylsulphonic acid solution system comprising methyl lead sulfonate and free methyl sulfonic acid, wherein the concentration of Pb<2+> is 50-200g / L, and the concentration of the free methyl sulfonic acid is 50-160g / L. The method comprises the following steps: placing a solution system electrolyte comprising the methyl lead sulfonate and free methyl sulfonic acid, a to-be-refined crude lead anode plate and a cathode plate into an electrolytic cell, then, applying direct-current power, adding an additive comprising one or a mixture of animal glue, lignosulfonate, aloin and beta-naphthol into the electrolyte to electrolyze for 2-7 days so as to generate cathode lead and anode mud, obtaining national-standard 1# lead ingot after melting and casting cathode lead, performing washing and filter pressing on the anode mud, and then feeding the anode mud to a noble metal extracting process. According to the method, a brand-new methanesulfonic acid solution system is adopted as an electrolyte for electrolysis, so that the method has the characteristic of being remarkable in environment-friendly advantage.

Description

technical field [0001] The invention relates to an electrolytic solution and an electrolysis method for electrolytically refining crude lead, and belongs to the technical field of hydrometallurgy. Background technique [0002] Crude lead produced by various methods contains a certain amount of impurities. In order to remove harmful impurities and recover valuable elements such as precious metals, it must be refined. The refining methods are divided into two types: fire refining and electrolytic refining. There are many pyro-refining processes, which produce a large amount of lead-containing smoke and waste residue, serious environmental pollution, poor working environment, and low lead yield and comprehensive recovery rate of valuable elements such as precious metals. Therefore, the electrolytic refining of crude lead is widely used in Canada and the United States. , Japan and China are widely used. [0003] At present, the electrolytic refining of crude lead uses a solutio...

AI Technical Summary

Problems solved by technology

There are many pyro-refining processes, which produce a large amount of lead-containing smoke and waste residue, serious environmental pollution, poor working environment, and low lead yield and comprehensive recovery rate of valuable elements such as precious metals. Therefore, the electrolytic refining of crude lead is widely used in Canada and the United States. , Japan and China are widely used

[0003] At present, the electrolytic refining of crude lead uses a solution system composed of fluorosilicic acid and lead fluorosilicic acid as the electrolyte for electrolysis. The main disadvantages of electrolysis in this system are: (1) fluorosilicic acid is volatile and decomposes into toxic HF and SiF 4 Gas, a large amount of acid mist is formed at the work site, which has an unpleasant smell and is very harmful to the human body and the environment; (2) In the widely used 105~200A / m 2 Under the current density, the corresponding cell voltage is as high as 0.36~0.7V, and the DC power consumption per ton of lead is 110~190kw h, which is high energy consumption; (3) The current efficiency is low, only about 90%