Technology for separating and purifying bismuth from lead-bismuth alloy

Abstract

The invention discloses a technology for separating and purifying bismuth from lead-bismuth alloy. The technology comprises the following steps: continuously carrying out vacuum distillation by adopting a vacuum distillation furnace system to separate and purify bismuth, wherein the vacuum distillation furnace consists of a melting furnace, a siphon tank and a vacuum distillation furnace; firstly continuously conveying the lead-bismuth alloy into a melting furnace body, melting, then conveying into the vacuum distillation furnace, carrying out vacuum distillation so as to separate and purify the bismuth. The purity of bismuth obtained by separation can achieve more than 99.9%, the produced lead alloy has no bismuth residues, and the continuous separation of bismuth in the lead-bismuth alloy can be realized; the technology is low in cost, low in energy consumption and environment-friendly, thus meeting the industrial production requirements.

Description

technical field [0001] The invention relates to a process for separating and purifying bismuth from a lead-bismuth alloy, and belongs to the technical field of bismuth smelting separation and purification. Background technique [0002] Bismuth (bismuth), atomic number 83, silvery white or reddish, with metallic luster. Mainly used in the manufacture of fusible alloys, used in solder, fuses, fire-fighting devices, automatic sprinklers, boiler safety plugs, etc. At the same time, bismuth alloy has the property of not shrinking when solidified, and is used for casting printed lead characters and high-precision casting molds. Additionally, bismuth oxycarbonate and bismuth oxynitrate are used in the treatment of skin lesions and gastrointestinal disorders. [0003] Lead-bismuth alloys often appear as by-products in non-ferrous smelting or iron smelting plants, and their economic value and use value are not large. It needs to be separated and purified to become refined lead and ...

AI Technical Summary

Problems solved by technology

Disadvantages: (1) The cost of this method is relatively high, and large-scale production is required to generate economic value

(2) When the content of bismuth in the alloy is less than or equal to 12%, the cost of this method will be very high, and the industrial production application

(3) Strict operating requirements, easy to pollute the environment, and highly toxic to the environment

(4) After chlorination, both bismuth and lead need to be smelted again, causing the total cost to rise and continue to cause environmental pollution

Disadvantages: (1) The choice of mother liquor is more critical, otherwise it will easily lead to an increase in the content of lead impurities and low electrolysis efficiency, which will cause the separation process to fail to meet the requirements

(2) Due to electrolysis, its energy consumption is relatively high

(3) After bismuth is formed into anode slime, further processing is required, causing subsequent environmental pollution

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