Deoxidation method for molten salt and deoxidated molten salt

A molten salt and molten state technology, applied in the field of molten salt after deoxidation, can solve problems such as potential safety hazards, loss of pipelines and molten salt, and blockage of molten salt

Active Publication Date: 2017-03-22
上海联和日环能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem solved by the present invention is to overcome the problem of using HF-H in the molten salt system in the prior art. 2 In the bubbling method, the process control is strict, there are potential safety hazards, and the violent boiling of the water vapor expansion molten salt easily leads to the phenomenon of molten salt clogging the pipeline and loss of molten salt, which is not conducive to industrial production. A deoxidation method for molten salt is provided and Molten salt after deoxidation

Method used

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  • Deoxidation method for molten salt and deoxidated molten salt
  • Deoxidation method for molten salt and deoxidated molten salt
  • Deoxidation method for molten salt and deoxidated molten salt

Examples

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Effect test

Embodiment 1

[0052] The particle size of the carbon element introduced through the graphite crucible in Example 1 and Example 2 can be atomic level to hundreds of nanometers, generally below 500nm; the amount of carbon element is controlled by the time of the first heat preservation, which is about 0.1-0.3% , the above-mentioned percentages are mass percentages relative to the molten salt.

[0053] Example 1

[0054] Take 520g of LiF and 470g of BeF 2 Mix evenly, place in graphite crucible (the material of graphite crucible is high-purity graphite), under vacuum environment (2.1×10 -3 mmHg), the temperature was raised to 650°C (191°C higher than the melting point of the molten salt) at a rate of 5°C / min for the first time until the material was completely melted, and after the first heat preservation for 1 hour, it was cooled to 15°C at a rate of 15°C / min for the first time ℃, put it in a nickel crucible, and raise the temperature to 650 ℃ for the second time at a rate of 10 ℃ / min in a v...

Embodiment 2

[0058] Take 520g of LiF and 470g of BeF 2 Mix evenly, place in graphite crucible, under vacuum environment (5.6×10 -4 mmHg), heat up to 700°C at a rate of 15°C / min for the first time until the FLiBe is completely melted. After the first heat preservation for 8 hours, cool down to 20°C at a rate of 5°C / min for the first time, and place in a tungsten crucible , in a vacuum environment, the temperature was raised to 700°C at a rate of 15°C / min for the second time, so that the FLiBe was completely melted, and after the second heat preservation was continued for 8 hours, the second time was cooled to 20°C at a rate of 5°C / min.

Embodiment 3

[0060] Take 222g of KCl, 252g of FeCl 2 Mix with 1g of high-purity carbon powder (1200 mesh particle size, purchased from Fangda Carbon New Material Technology Co., Ltd.), place it in a molybdenum crucible, and place it in a vacuum environment (3.9×10 -5 mmHg), the temperature was raised to 500°C at a rate of 15°C / min for the first time until the material was completely melted. ℃ / min to 500 ℃, so that the ClKFe is completely melted, and after the second heat preservation for 4 hours, the second time is cooled to 25 ℃ at a rate of 5 ℃ / min, and the third time is heated to 500 ℃ at a rate of 15 ℃ / min, so that ClKFe is completely melted, and after the third heat preservation for 4 hours, the third time is cooled to 25°C at a rate of 15°C / min.

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Abstract

The invention discloses a deoxidation method for a molten salt and a deoxidated molten salt. The method comprises the following steps: introducing carbon into the molten salt, carrying out first-time heating under vacuum conditions until the molten salt is molten, carrying out first-time heat preservation, carrying out first-time cooling, then, carrying out second-time heating until the molten salt is molten, carrying out second-time heat preservation, and carrying out second-time cooling, thereby obtaining the deoxidated molten salt, wherein the molten salt is a fluoride molten salt and/or chloride molten salt. The deoxidation method disclosed by the invention is high in deoxidation efficiency and simple and easy in operation and is safe, reliable and controllable, the carbon-reduction product is removed in the form of gas and does not deposit, and nitrate radicals, sulfate radicals, free oxygen and oxygen-derived free radicals are removed from the molten salt, so that industrial production is facilitated; and in case of later-stage molten-salt treatment by HF-H2, phenomena that pipelines are blocked up by the molten salt and the molten salt is lost due to acute boiling of the molten salt caused by water vapor expansion are absent.

Description

technical field [0001] The invention specifically relates to a method for deoxidizing chloride molten salt and / or fluoride molten salt and the deoxidized molten salt. Background technique [0002] Molten salt refers to the molten body formed after the salt is melted or the solid after the molten body is cooled. Generally, molten salt is called a melt in a high temperature state, and a solid solution in a solidified state at a low temperature. [0003] During the preparation of uranium-containing fluoride molten salts, several impurities are inherent in the raw materials, such as sulfur (mostly in the form of SO 4 2- form), nitrate, oxygen free radicals, etc., and because some fluoride molten salts are hygroscopic, they can contain up to 0.4% of water. ZrO is also contained in uranium and zirconium fluorine molten salts 2 or ZrOF 2 , UF 4 It contains a small amount of water, about 1% of hexavalent U (its possible molecular form is UO 2 f 2 ) and trace UO 2 , the main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B9/02C01B9/08
Inventor 谢雷东朱国平张国欣金婵李明广葛敏谢梦雅
Owner 上海联和日环能源科技有限公司
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