Selenium absorption tower

Abstract

The invention discloses a selenium absorption tower which comprises a tower body and a tower cover fixedly connected with the upper end of the tower body, wherein a feeding hole and an exhaust hole are formed in the tower cover; an in-tower insert pipe is inserted into the exhaust hole; at least one air hole communicated with an inner chamber of the in-tower insert pipe is formed in the lower end of the in-tower insert pipe; the highest point of the air hole is located on a liquid level line of the absorbing liquid in the absorption tower; a cooling jacket for circulating the cooling liquid is arranged on an outer wall of the tower body; and the liquid level line means the contour line of the liquid level when the absorbing liquid in the absorption tower reaches a specified containing volume. In the selenium absorption tower, the air hole is formed at the lower end of the in-tower insert pipe, and the highest point of the air hole is lower than the liquid level line of the absorbing liquid in the absorption tower; when the absorbing liquid in the absorption tower reaches the specified containing volume, the air hole is completely soaked into the absorbing liquid; and when the selenium absorption tower runs, the raw gas containing selenium dioxide is processed with the absorbing liquid and then is discharged from the absorption tower through the in-tower insert pipe, so that the recovery efficiency of selenium dioxide can be increased.

Description

technical field [0001] The invention relates to the field of selenium element recovery, in particular to a selenium element absorption tower. Background technique [0002] At present, in the recovery process of selenium element, the material containing selenium element is firstly boiled at high temperature to vaporize the selenium element, then the selenium element gas is absorbed with lye, and finally the pasty substance formed by absorbing the selenium element is Separation is carried out to obtain selenium element. [0003] The absorption efficiency of selenium gas in the absorption tower affects the recovery efficiency of alkene. In order to improve the absorption rate of selenium gas, the patent application number 201420757400.2 discloses a device for absorbing selenium dioxide gas. In this device, A partition plate is arranged in the middle of the absorption tank, and a plurality of separation holes are arranged on the partition plate. When the device is in operation,...

AI Technical Summary

Problems solved by technology

But in the selenium dioxide gas process, along with the increase of selenium dioxide content in the absorption liquid, the temperature of the absorption liquid also raises gradually, has reduced the dissolving speed in the absorption liquid of selenium dioxide gas, makes the selenium dioxide gas The absorption efficiency is reduced. At this time, the absorption liquid can only be replaced. Due to the low content of selenium dioxide in the absorption liquid, the subsequent process of refining selenium dioxide is complicated and the cost is increased.

In addition, although the device is provided with a partition plate, the device is also provided with an air extraction device, so that the selenium dioxide gas can be quickly released from the absorption liquid, which affects the absorption effect of the absorption liquid on the selenium dioxide gas, making the pasty substance The content of selenium dioxide in the medium is low, has influenced the recovery effect of selenium dioxide

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