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5N selenium production process

A production process and product technology, applied in the field of 5N selenium production process, can solve the problems of inability to meet the demand for high-purity selenium, production technology and process lag, low product recovery rate, etc., to ensure full utilization, short process cycle, and process flow simple effect

Inactive Publication Date: 2019-02-12
CNBM CHENGDU OPTOELECTRONICS MATERIAL
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Problems solved by technology

[0005] Generally, the existing high-purity selenium purification process has disadvantages such as long process, complex production process, low product recovery rate, and small production capacity.
With the increasing demand for high-purity selenium in the international market, the current production technology and process of high-purity selenium are relatively lagging behind, which is far from meeting the market's demand for high-purity selenium

Method used

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  • 5N selenium production process

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Embodiment 1

[0051] ① Before rectification and feeding, the rectification tower and the utensils used are cleaned with 20% NaOH solution, soaked in 30% aqua regia, fully washed with deionized water, and dried.

[0052] ② Power on and preheat, quartz rectification raw material kettle, product kettle and condensation section to 200°C.

[0053]③ Break the 4N Se block into small pieces, put it into the chemical material crucible, remove the oxidized slag on the surface after melting, and then add the melted selenium raw material into the distillation raw material kettle. Seal the rectification system, cover the vacuum plug, open the vacuum system to vacuum the quartz rectification system to 1-8×10 -3 Pa, start heating up to 300-420°C, start counting the time, and control the temperature of the product kettle to 190-300°C.

[0054] ④ After the rectification is over, firstly keep the temperature of the rectification kettle at 350--400°C, which is convenient for discharging, and then stop the va...

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Abstract

The invention relates to a 5N selenium production process, which comprises the following main steps of using 4N selenium as raw materials; the raw materials are treated by two steps including meltingfor oxidizing slag removal and vacuum blocking element gas phase rectification. Through the early stage treatment on the raw material such as oxidizing slag removal in the production process, the rawmaterial purity is improved; then, the goal of element gas phase vacuum rectification is performed to achieve the refining goal; the high-purity 5N selenium is produced.

Description

technical field [0001] The invention relates to a 5N selenium production process, which belongs to the field of metallurgical purification. Background technique [0002] Metal selenium and certain compounds of selenium are well-known semiconductors, have excellent physical and chemical properties, and have extensive and special uses. Selenium is in the VIA group (oxygen group) of the periodic table of elements, and the abundance of selenium in the earth's crust 9×10 -6 %, mostly exists in the form of compounds in nature, and is widely distributed in sulfide minerals, such as selenium copper ore, selenium copper silver ore, etc. High-purity selenium refers to two specifications of selenium content in selenium products: 99.999% 5N and 99.9999% 6N, that is, the total amount of other impurity elements in new products is less than 10ppm and 1ppm. [0003] In recent years, with the continuous development of photoconductive material technology, semiconductor laser technology, sem...

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Application Information

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IPC IPC(8): C01B19/02
CPCC01B19/02C01P2006/80
Inventor 彭寿马立云潘锦功殷新建陈直钟光平
Owner CNBM CHENGDU OPTOELECTRONICS MATERIAL