Method for extracting iodine from dehydrate wet method diluted phosphoric acid reaction iodic waste gas

A method of phosphoric acid and iodine extraction technology, applied in the field of phosphoric acid to achieve the effects of improving atmospheric environment, good environmental protection effect and large benefit

Inactive Publication Date: 2013-04-03
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is no technical scheme for recovering iodine from the iodine-containing waste gas from the reaction of dihydrate wet-process phosphoric acid

Method used

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  • Method for extracting iodine from dehydrate wet method diluted phosphoric acid reaction iodic waste gas

Examples

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Effect test

Embodiment 1

[0021] A factory adopts the technology of the present invention to extract iodine from the iodine-containing waste gas of dihydrate wet-process phosphoric acid reaction, and the specific scheme is as follows:

[0022] ① Collect the mass fraction of iodine in the reaction waste gas of dihydrate wet-process phosphoric acid to be 3×10 －6 ~10×10 －6 For the iodine-containing gas, the fluorine in the reaction exhaust gas is first washed with Venturi scrubber and scrubber with water;

[0023] ② The iodine-containing waste gas enters the packed iodine absorption tower after removing fluorine, fills the sealing tank of the iodine absorption tower with 10000 kg of water, and continuously feeds the absorbent SO into the sealing tank of the iodine absorption tower 2 ; The amount of absorbent added is 1kg / h;

[0024] ③ Use a perfluorinated washing circulation pump to pump the liquid in the sealing tank into the iodine absorption tower for spraying and circulating washing;

[0025] ④ The...

Embodiment 2

[0029] A factory adopts the technology of the present invention to extract iodine from the iodine-containing waste gas of dihydrate wet-process phosphoric acid reaction, and the specific scheme is as follows:

[0030] ① Collect the mass fraction of iodine in the reaction waste gas of dihydrate wet-process phosphoric acid to be 3×10 －6 ~10×10 －6 For the iodine-containing gas, the fluorine in the reaction exhaust gas is first washed with Venturi scrubber and scrubber with water;

[0031] ② The iodine-containing waste gas enters the packed iodine absorption tower after removing fluorine, fills the sealing tank of the iodine absorption tower with 10000 kg of water, and continuously feeds the absorbent SO into the sealing tank of the iodine absorption tower 2 ; The amount of absorbent added is 5kg / h;

[0032] ③ Use a perfluorinated washing circulation pump to pump the liquid in the sealing tank into the iodine absorption tower for spraying and circulating washing;

[0033] ④ The...

Embodiment 3

[0037] A factory adopts the technology of the present invention to extract iodine from the iodine-containing waste gas of dihydrate wet-process phosphoric acid reaction, and the specific scheme is as follows:

[0038] ① Collect the mass fraction of iodine in the reaction waste gas of dihydrate wet-process phosphoric acid to be 3×10 －6 ~10×10 －6 For the iodine-containing gas, the fluorine in the reaction exhaust gas is first washed with Venturi scrubber and scrubber with water;

[0039] ② The iodine-containing waste gas enters the packed iodine absorption tower after removing fluorine, fills the sealing tank of the iodine absorption tower with 10,000 kg of water, and continuously adds sulfur into the sealing tank of the iodine absorption tower; the amount of absorbent added is 3kg / h;

[0040] ③ Use a perfluorinated washing circulation pump to pump the liquid in the sealing tank into the iodine absorption tower for spraying and circulating washing;

[0041] ④ The exhaust gas i...

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Abstract

The invention discloses a method for extracting iodine from a dehydrate wet method diluted phosphoric acid reaction iodic waste gas. The method comprises the following steps: (1) collecting an iodic waste gas, and scrubbing in water by using a venturi scrubber and a scrubbing tower; (2) feeding the iodic waste gas subjected to defluorination into an iodine absorbing tower filled with materials, wherein a sealing tank is installed at the lower part of the tower and is filled with water and added with absorbent; (3) pumping the liquid in the sealing tank by using a washing circulation pump into the absorbing tower to be washed in circulation; (4) discharging the washed waste gas into the atmosphere through a fan; (5) after the concentration of the iodine in the liquid in the sealing tank achieves 50g/L, pumping the iodic liquid into an iodine precipitation tank, and adding hydrogen peroxide so as to precipitate the iodine in a crystal mode; and (6) filtering the liquid of iodic crystal, feeding back the liquid into the sealing tank of the absorbing tower, and obtaining 90% of crude iodine in a centrifugal mode. By utilizing the method, the iodine in the dehydrate wet method phosphoric acid reaction waste gas is effectively recycled, so that larger benefits are brought to enterprises, and meanwhile the on-site atmosphere environment is improved with good environmental-protection effect.

Description

technical field [0001] The present invention relates to phosphoric acid, and also relates to iodine, in particular, relates to the recovery and utilization of iodine-containing gas in the production of dilute phosphoric acid. Background technique [0002] In the production process of wet-process phosphoric acid, sulfuric acid decomposes phosphate rock to release a large amount of heat and generate a large amount of reaction waste gas. After analysis, the waste gas contains iodine. This iodine-containing gas is usually emitted as a waste gas. At present, there is no good treatment method for extracting iodine from the iodine-containing waste gas of the dihydrate wet-process phosphoric acid reaction. [0003] The technical solutions for recovering iodine from wet-process phosphoric acid production in the Chinese patent database include No. 200510003058.2 "Method for Extracting Iodine from Dilute Phosphoric Acid Produced in the Production Process of Iodine-Containing Phosphoru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/14B01D53/14
Inventor 吴松
Owner WENGFU (GRP) CO LTD
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