Absorption method of fluorine

A gas and separator technology, applied in the field of fluorine absorption, can solve the problems of high fluorine content in circulating water, impact on device production, low fluorine recovery rate, etc., and achieve the effects of increasing fluorine washing nozzles, convenient maintenance and cleaning, and reducing corrosion

Active Publication Date: 2009-07-08
WENGFU (GRP) CO LTD
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Problems solved by technology

However, the recovery rate of fluorine in this method is low, which on the one hand causes waste of resources; on the...

Method used

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  • Absorption method of fluorine

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Embodiment Construction

[0015] A method for absorbing fluorine, comprising the steps of:

[0016] (1) Phosphoric acid gas enters the fluorine washing vacuum tube A2 with the fluorine washing nozzle A1, and performs the first concurrent washing in the pipeline; the washing and absorption in the pipeline is used to increase the gas-liquid phase contact time and improve the fluorine absorption rate.

[0017] (2) Phosphoric acid gas after co-current washing enters the first-stage separator 3 for gas-liquid separation, and the separated liquid phase (fluorosilicic acid) enters the first-stage scrubber liquid through the lower liquid pipe of the first-stage separator 3 Seal tank 4 and carry out circular washing;

[0018] (3) Phosphoric acid gas after separation enters the fluorine washing vacuum tube B6 that has the fluorine washing nozzle B5 for second washing, and the gas after washing enters the second stage separator 7 for gas-liquid separation, and the liquid phase after separation passes through the ...

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Abstract

The invention discloses a method for absorbing fluorine. Phosphoric acid gas enters into a fluorine washing vacuum tube A(2) with a fluorine washing nozzle A(1) for the first time parallel current and washing in a pipeline, and then enters into a first level separator (3) for gas-liquid separation; the separated liquid phase part enters into a first level scrubber liquid seal trough (4) for circulation cleaning; the separated phosphoric acid gas enters into a fluorine washing vacuum tube B(6) with a fluorine washing nozzle B(5) for the second time washing; the washed gas enters into a secondary level separator (7) for gas-liquid separation; the separated liquid phase enters into a secondary level scrubber liquid seal trough (8) for circulation cleaning; the separated gas phase enters into a fluorine separator (9) for gas-liquid separation; the separated liquid phase part passes through the secondary level scrubber liquid seal trough (8) by a lower liquid pipe; the separated gas enters into a circulating water system. The method has high recovery rate, can effectively lighten corrosion maintenance on devices, thus being convenient for cleaning; in addition, the method has low cost.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for absorbing fluorine. Background technique [0002] As we all know, in the production of wet-process phosphoric acid, by absorbing SiF in the secondary steam from the evaporation chamber during the concentration of phosphoric acid 4 And HF by-product fluosilicic acid. The traditional production method is to wash and absorb SiF with water 4 And HF, that is, in the absorption tower, the phosphoric acid gas is washed countercurrently with water, so that water, silicon tetrafluoride and hydrogen fluoride react to form fluosilicic acid. However, the recovery rate of fluorine in this method is low, which on the one hand causes waste of resources; on the other hand leads to high fluorine content in circulating water, which seriously affects the production of the entire device. Contents of the invention [0003] The purpose of the present invention is to provide a fluorin...

Claims

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Application Information

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IPC IPC(8): B01D53/18B01D53/68C01B25/234C01B7/19C01B33/113
Inventor 黄进张涛冯克敏刘海文慧姚石林吴松付忠德孟文祥李维红
Owner WENGFU (GRP) CO LTD
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