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Device and method for increasing absorption rate of iodine-containing tail gas

A technology of absorption rate and exhaust gas is applied in the field of devices for improving the absorption rate of iodine-containing exhaust gas, which can solve the problems of polluted environment, excessive iodine content, waste of resources, etc., and achieve the effects of good absorption effect, large contact area and remarkable absorption effect.

Inactive Publication Date: 2014-12-10
GANSU WENGFU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a device and method for improving the absorption rate of iodine-containing tail gas in order to solve the problems that the iodine content in the exhausted tail gas exceeds the standard when extracting iodine from phosphate rock, resulting in resource waste and environmental pollution.

Method used

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  • Device and method for increasing absorption rate of iodine-containing tail gas

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Embodiment 1

[0026] Iodine is extracted from the dilute phosphoric acid produced in the production process of iodine-containing phosphorus ore, iodine is separated, and the iodine is separated by means of filtration, and finally solid-liquid separation and filtration are achieved to obtain crude iodine and iodine-containing filtrate; The filtrate of L is added in the washing liquid tank 8 through the pipeline 14, and the SO of 40% of the mass percent of the filtrate is passed into 2 As a washing liquid; the mass percentage concentration is 20% sodium sulfite solution is packed in the absorption liquid tank 2 as the absorption liquid, and then sent to the absorption tower 1 by the pump 3, and simultaneously passes into the absorption tower through the pipeline 16 containing The extraction gas of iodine 40mg / L is returned in the absorption liquid tank 2 through the circulation line 5 after being absorbed by the absorption liquid in the absorption tower 1, and then is sent to the absorption t...

Embodiment 2

[0028] Iodine is extracted from dilute phosphoric acid produced in the production process of iodine-containing phosphorus ore, iodine is separated, and the iodine is separated by means of filtration, and finally solid-liquid separation and filtration are achieved to obtain crude iodine and iodine-containing filtrate; The filtrate of L is added in the washing liquid tank 8 by pipeline 14, and the SO of 45% of filtrate mass percentage is passed into 2 As a washing liquid; the mass percentage concentration is 20% sodium sulfite solution is packed in the absorption liquid tank 2 as the absorption liquid, and then sent to the absorption tower 1 by the pump 3, and simultaneously passes into the absorption tower through the pipeline 16 containing The extraction gas of iodine 35mg / L is returned to the absorption liquid tank 2 through the circulation pipeline 5 after being absorbed by the absorption liquid in the absorption tower 1, and then is sent to the absorption tower 1 by the pump...

Embodiment 3

[0030] Iodine is extracted from the dilute phosphoric acid produced in the production process of iodine-containing phosphorus ore, iodine is separated, and the iodine is separated by means of filtration, and finally solid-liquid separation and filtration are achieved to obtain crude iodine and iodine-containing filtrate; The filtrate of L is added in the washing liquid tank 8 through the pipeline 14, and the SO of 35% of the mass percent of the filtrate is passed into 2 As a washing liquid; the mass percentage concentration is 20% sodium sulfite solution is packed in the absorption liquid tank 2 as the absorption liquid, and then sent to the absorption tower 1 by the pump 3, and simultaneously passes into the absorption tower through the pipeline 16 containing The extraction gas of iodine 20mg / L is returned in the absorption liquid tank 2 through the circulation line 5 after being absorbed by the absorption liquid in the absorption tower 1, and then is sent to the absorption t...

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Abstract

The invention discloses a device and a method for increasing the absorption rate of iodine-containing tail gas. The device comprises an absorbing liquid tank, a washing tower and a washing tank, wherein absorbing liquid in the absorbing liquid tank is pumped into an absorbing tower, flows through the absorbing tower and then returns into the absorbing liquid tank by another pipeline; the top end of the absorbing tower is provided with a gas escaping hole which is connected with the washing tower by a pipeline; the bottom part of the washing tower is communicated with the washing tank by a pipe section; the side part of the washing tower is communicated with the washing tank by a pumping pipeline; a branch pipeline is arranged on the pumping pipeline and leads into the absorbing liquid tank. The device and the method disclosed by the invention have the advantages that by adoption of a two-stage circulating system, iodine absorption is facilitated, and iodine steam discharged to the outside is reduced to be 4mg / L, so that the environment-protecting requirement is met, and the effect is obvious; the iodine absorption rate is increased to be 80% and economic benefit is improved.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a device and a method for improving the absorption rate of iodine-containing tail gas. Background technique [0002] Extracting iodine from phosphate rock is mainly carried out by using phosphoric acid produced from iodine-containing phosphate rock as a raw material. During the production of dilute phosphoric acid, the iodine is distributed in flue gas, phosphoric acid and phosphogypsum. Iodine is extracted from dilute phosphoric acid produced in the production process of iodine-containing phosphorus ore, and iodine is usually separated by means of filtration after iodine precipitation, and finally solid-liquid separation and filtration are achieved to obtain crude iodine and iodine-containing filtrate; the main components of the filtrate It is water, but it contains a large amount of residual oxidant and iodine, which is acidic and has strong oxidizing properties; th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/18
Inventor 张军
Owner GANSU WENGFU CHEM
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