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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: 2010-10-13
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

Examples

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Effect test

Embodiment 1

[0013] Example 1: Using thallium-containing slag as raw material, its main components by weight percentage 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 the temperature at 500-550°C, and heat for 30 minutes, among which the temperature is kept at 550°C for 20 minutes, and the vacuum is 8-20Pa. Obtain the primary evaporation containing Cd and Zn and the primary residue containing Tl, with the purpose of enriching as much Tl as possible in the primary residue while removing Cd and Zn;

[0014] Use the primary residue as raw material to carry out vacuum secondary separation, control the temperature at 900-1000°C, and heat for 35 minutes, among which the temperature is kept at 1000°C for 20 minutes, and the vacuum degree is kept at 8-20Pa. To obtain the secondary evaporation containing Tl and the secondary residue containing Fe, Cu, Ni, Si, the purpose is to achieve the enrichment of as much Tl as possible in t...

Embodiment 2

[0016] Example 2: The main components by weight of thallium-containing 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, controlled temperature 550- 600°C, heating time 30min, among which 20min at 580°C, vacuum 8-40Pa. Obtain the primary evaporation containing Cd and Zn and the primary residue containing Tl, with the purpose of enriching as much Tl as possible in the primary residue while removing Cd and Zn;

[0017] Use the primary residue as raw material to carry out vacuum secondary separation, control the temperature at 1050-1100°C, heat for 35 minutes, keep the temperature at 1100°C for 20 minutes, and keep the vacuum at 8-40Pa. To obtain the secondary evaporation containing Tl and the secondary residue containing Fe, Cu, Ni, Si, the purpose is to achieve the enrichment of as much Tl as possible in the secondary while removing elements such as Fe, Cu, Ni, Si, etc. in the evaporator.

[0018] Then use the secondar...

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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, which belongs to the technical field of vacuum metallurgy. 2. Background technology [0002] Thallium (Tl) is a kind of scattered metal, which is rare and scattered 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, due to mining, metal smelting and other ways, a large amount of Tl has been released into the environment, causing serious regional pollution. Thallium is widely used and penetrates into many fields of the national economy. With the advancement of science and technology, its application range is also expanding. Therefore, it is of great significance to carry out the research and treatment of Tl bioavailability and Tl pollution. [0003] The known extraction methods of metal thallium mainly include: ion exchange m...

Claims

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Application Information

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Patent Type & Authority Patents(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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