Method for extracting thallium from thallium containing slag

A technology for extracting metal and thallium slag, which is applied in the direction of improving process efficiency, can solve the problems of high price and thallium pollution of the electrolytic thallium extraction method, and achieves the effects of flexible extraction purity grade, low energy consumption and simple equipment.

Inactive Publication Date: 2008-12-03
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

However, the electrolytic thallium extraction method is expensive and has the problem of thallium pollution

Method used

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  • Method for extracting thallium from thallium containing slag

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Effect test

Embodiment 1

[0013] Example 1: Using thallium-containing slag as raw material, its main components are Cd 60.8%, Cu 2.10%, Ni 3.02%, Pb 1.64%, Zn 0.0056%, Si 0.50%, Tl 24.68%, and vacuum primary separation , Control temperature 500-550℃, heating time 30min, of which heat preservation at 550℃ for 20min, vacuum 8-20Pa. Obtaining a primary evaporate containing Cd and Zn and a primary residue containing Tl, the purpose is to achieve as much Tl as possible enrichment in the primary residue while removing Cd and Zn;

[0014] Use the primary residue as the raw material to perform vacuum secondary separation, control the temperature at 900-1000°C, and the heating time for 35min, of which the temperature is kept at 1000°C for 20min, and the vacuum degree is kept at 8-20Pa. Obtain the secondary evaporate containing Tl and the secondary residue containing Fe, Cu, Ni, Si, the purpose is to achieve the removal of Fe, Cu, Ni, Si and other elements at the same time, as much as possible enrichment of Tl in th...

Embodiment 2

[0016] Example 2: The weight percentages of the main components of the raw material containing thallium slag are Cd 59.2%, Cu 2.50%, Ni 2.82%, Pb 1.24%, Zn 0.015%, Si 0.60%, Tl 20.68%, vacuum primary separation, control temperature 550- 600°C, heating time 30min, of which heat preservation at 580°C for 20min, vacuum 8-40Pa. Obtaining a primary evaporate containing Cd and Zn and a primary residue containing Tl, the purpose is to achieve as much Tl as possible enrichment in the primary residue while removing Cd and Zn;

[0017] The primary residue is used as the raw material, and the vacuum secondary separation is carried out, the temperature is controlled at 1050-1100°C, the heating time is 35min, and the temperature is kept at 1100°C for 20min, and the vacuum degree is maintained at 8-40Pa. Obtain the secondary evaporate containing Tl and the secondary residue containing Fe, Cu, Ni, Si, the purpose is to achieve the removal of Fe, Cu, Ni, Si and other elements at the same time, as...

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Abstract

The invention relates to a method for extracting metallic thallium from thallium-containing slag, and belongs to the vacuum metallurgy technology field. The thallium-containing slag is adopted to extract the metallic thallium in a vacuum firing furnace based on three-step distillation; the vacuum degree is control between 8 to 40Pa, and the time is 30 to 60 minutes; three-step distillation temperatures respectively range from 450 to 600 DEG C, from 900 to 1100 DEG C, and from 700 to 850 DEG C; the purity quotient of the thallium which is extracted in the vacuum firing furnace can reach more than 99.9 percent; the coefficient of recovery of the thallium can reach more than 90 percent.

Description

1. Technical Field [0001] The invention relates to a method for extracting metal thallium from thallium-containing slag, and belongs to the technical field of vacuum metallurgy. 2. Background technology [0002] Thallium (Tl) is a kind of rare metal, which is less and dispersed in nature. Thallium is often associated with metal ores. Thallium is also a toxic metal element, and its toxicity is higher than that of mercury, cadmium, and lead. In recent years, a large amount of Tl has been released into the environment due to mining, metal smelting and other means, causing serious regional pollution. Thallium has a wide range of applications and penetrates into many areas of the national economy. With the advancement of science and technology, its scope of application is also expanding. Therefore, it is of great significance to carry out the research and treatment of Tl bioavailability and Tl pollution. [0003] The well-known methods for extracting thallium metal mainly include: ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B61/00C22B7/04C22B5/16
CPCY02P10/20
Inventor 杨斌戴永年姚顺忠马文会刘大春徐宝强刘永成周晓奎汪镜福秦博
Owner KUNMING UNIV OF SCI & TECH
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