A kind of regeneration method of active alumina defluorination agent

A technology of activated alumina and fluorine removal agent, which is applied in the field of smelting flue gas purification and environmental protection, can solve the problems of unable to guarantee the stable recycling of alumina, large loss of alumina, and low regeneration efficiency, so as to maintain good adsorption performance and reduce Alumina loss and effect of improving regeneration efficiency

Active Publication Date: 2021-01-01
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0007] Aiming at the problem that the existing regeneration method is difficult to solve the regeneration of activated alumina and cannot ensure the stable and cyclic use of alumina, the present invention proposes a regeneration method of activated alumina defluoridation agent, which can solve the problem of existing activated alumina regeneration treatment. In the method, the regeneration efficiency is low, the loss of alumina is large, and the operation is complicated, etc., and the alumina regenerated by the method of the present invention can recover a good defluorination effect, which meets the requirements of stable and cyclic use of activated alumina defluorination agent

Method used

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  • A kind of regeneration method of active alumina defluorination agent
  • A kind of regeneration method of active alumina defluorination agent
  • A kind of regeneration method of active alumina defluorination agent

Examples

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Embodiment 1

[0025] A method for regenerating an activated alumina defluorination agent, which uses saturated adsorbed activated alumina as the treatment object, and its specific steps include:

[0026] (1) Place the quartz boat containing the activated alumina in a tube furnace, and continue to -1 The speed is passed into the mixed gas of nitrogen and water vapor, and the volume fraction of water vapor in the said mixed gas is 10%;

[0027] (2) Set the tube furnace at 5°C·min -1 The temperature is raised to 200°C at a rate of 60 minutes, and then 10°C·min -1 Raise the temperature at a rate of 500°C to the regeneration temperature and keep it warm for 1 hour. The tail gas produced is absorbed by the water in the absorption bottle and collected for recycling. After the heating is completed, the ventilation is stopped, and the regenerated alumina is obtained by naturally cooling to room temperature.

[0028] The removal rate of fluorine was calculated by detecting the content of fluorine i...

Embodiment 2

[0030] This example differs from Example 1 only in that the regeneration temperature is 600°C. The removal rate of fluorine was calculated by detecting the content of fluorine in the sample by XRF, and the results are shown in Table 1.

Embodiment 3

[0032] The only difference between this embodiment and embodiment 1 is that the regeneration temperature is 700 degrees. The removal rate of fluorine was calculated by detecting the content of fluorine in the sample by XRF, and the results are shown in Table 1.

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Abstract

The invention discloses a regeneration method of an active alumina fluorine remover; with saturated-adsorption activated alumina as a treatment object, the method comprises the concrete steps: (1) placing a quartz boat containing active alumina in a tubular furnace, and continuously introducing regeneration gas; and (2) heating the tubular furnace to a regeneration temperature, carrying out heat preservation for 1-3 h, absorbing produced exhaust gas by an absorption liquid in an absorption bottle, collecting for cyclic utilization, after the end of heating, stopping introduction of the regeneration gas, naturally cooling to room temperature, and thus obtaining regenerated alumina. Activated alumina is regenerated by the method, the method has the advantages of simple operation, excellent regeneration effect, no loss of alumina and the like, and the regenerated alumina has good adsorption performance and can be recycled for many times.

Description

technical field [0001] The invention relates to the technical field of smelting flue gas purification and environmental protection, in particular to a regeneration method of an activated alumina defluorination agent. Background technique [0002] Fluoride is one of the important air pollutants. With the rapid development of industry, iron and steel plants, non-ferrous smelters, phosphate fertilizer plants, cement plants and coal-fired power plants that use fluorine-containing minerals as main raw materials or auxiliary materials produce more and more fluorides during the smelting process. Part of it is discharged into the atmosphere with smelting flue gas in the form of HF, which not only seriously corrodes industrial equipment, but also causes atmospheric fluorine pollution, soil pollution and water pollution, and destroys the balance of the entire ecological environment, which should be highly valued. [0003] Dry defluorination refers to the use of HF's strong polarity, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/08B01J20/34B01D53/02
CPCB01D53/02B01D2257/2047B01J20/08B01J20/3458
Inventor 郑国渠张惠斌曹华珍
Owner ZHEJIANG UNIV OF TECH
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