Lead electrolyte and purification method of impurity metal ions in anode slime washing water

Abstract

A purifying method for removing impurities metal ions in lead electrolyte and anode slime washing water comprises the following steps: for removing impurities metal ions in the lead electrolyte, installing an anode plate and a cathode plate in an electrolytic cell, controlling the electrolyte circulation speed in the electrolytic cell at 8-10 L / min, sampling and detecting once every 6-12 h until the impurities metal ions in the electrolyte reach the standard, and then conducting electricity to perform normal production; and for removing impurities metal ions in anode slime washing water, conveying anode slime washing water to a washing water purifying tank, installing a lead plate in the tank, controlling the ratio of the lead plate superficial area to the anode slime washing water volume, reacting and clarifying for 24-48 h, after the impurities metal ions in the anode slime washing water reach the standard, mixing with an electrolyte. The purification method helps to solve the technical problem that unqualified precipitated lead is produced in a high-impurity crude lead electrolytic refining process or a lead electrolysis recovery production preliminary stage because impurities metal ions in electrolytes exceed standard; the precipitated lead produced by employing the purification method has qualified quality; and the purification method has the advantages of simple operation, high production efficiency and high valuable metal recovery rate, and the economic benefit is substantial.

Description

technical field [0001] The invention relates to the field of lead electrolytic refining, in particular to a method for purifying impurity metal ions in lead electrolyte and anode slime washing water. Background technique [0002] In recent years, my country's lead smelting capacity and output have increased significantly, the structural contradictions in the lead industry have further intensified, and industry competition has become increasingly fierce. With the increasing depletion of mineral resources and the increasing production cost of lead smelting, many lead smelting enterprises have changed their concept. Low (about 90%), high-impurity crude lead with high content of arsenic, antimony, bismuth, copper and gold and silver is then electrolytically refined to comprehensively recover valuable metals and improve the comprehensive recovery efficiency of enterprises. [0003] High-impurity crude lead is used for electrolytic refining. In order to reduce the entry of impuri...

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Problems solved by technology

[0003] High-impurity crude lead is used for electrolytic refining. In order to reduce the entry of impurity metal ions into the electrolyte, low current density (≤140A / m) is generally used at home and abroad. 2 ), the production efficiency is low, and the medium and high current density (≥170A / m 2 ), it will inevitably cause the impurity metal ions in the anode slime washing water and the electrolyte to exceed the standard by a large margin. The common practice at home and abroad is to use 1 to 3 cycles to increase the current density to precipitate impurity metal ions, and the precipitated lead of impurity metal ions exceeding the standard is returned to the anode mold as the anode plate, resulting in repeated metal smelting and increased production costs.