A kind of lead electrolysis method containing high bismuth

Abstract

The present invention belongs to the field of lead production, and specifically relates to a high-bismuth-containing lead electrolysis method. The electrolysis conditions are as follows: (1) Anode chemical quality: Bi≤25%, Pb≤80%, Sb≤6%; electrolyte composition: h 2 SiF 6 : 40~80g / L; Pb 2+ : 20~80g / L; Bi 2+ : <0.006g / L; (2) Electrolyte circulation: 25L / min~30L / min; (3) Electrolysis temperature: 20~30℃; (4) Current density: 60~80A / m 2 ; (5) Electrolysis cycle: 5~8d. The cathode is divided into two pieces, one is lead, and the other is an intermediate piece, the lead piece is connected to the negative pole of the power supply, and the middle piece is grounded; the middle piece is composed of bismuth and / or copper. By setting an intermediate sheet between the anode and the cathode, and the intermediate sheet is grounded, the bismuth in the anode can be precipitated on the intermediate sheet after electrolysis; while lead is deposited on the cathode (lead sheet); through the above method, the cathode can be effectively solved. The problem of bismuth precipitation on the lead sheet.

Description

technical field [0001] The invention belongs to the field of lead production, and in particular relates to a high-bismuth-containing lead electrolysis method. Background technique [0002] Lead electrolytic refining is to use the lead that has undergone preliminary fire refining but still has a small amount of impurities as the anode, and use the electrolysis to separate the lead as the cathode, hang it in the electrolytic cell filled with the electrolyte, and conduct a chemical reaction through direct current to obtain pure lead and The process of anode slime containing valence metals. The advantage of the current general process is that it can process crude lead containing bismuth <1% and obtain high-purity lead at the same time; but it is not suitable for processing crude lead containing more than 10% bismuth. With the intensification of market competition, mines in various places have been exploited one after another, and the ore sources have changed greatly. The imp...

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Problems solved by technology

The advantage of the current general process is that it can process crude lead containing bismuth <1% and obtain high-purity lead at the same time; but it is not suitable for processing crude lead containing more than 10% bismuth

With the intensification of market competition, mines in various places have been exploited one after another, and the ore sources have changed greatly. The impurity composition of crude lead produced by small and medium-sized smelters in various places fluctuates widely, and some contain more than 10% bismuth. This lead is commonly known as lead-bismuth alloy. Treating with the traditional process will make it difficult to control the technical conditions of electrolytic production, the production status will deteriorate, and it will not be possible to produce high-grade lead

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