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Method for extracting iodine from iodine containing underground bittern

A technology for extracting iodine from underground brine, applied in the field of extracting iodine, can solve problems such as environmental pollution, waste discharge, etc., and achieve the effects of expanding the selection range, saving consumption and low production cost

Active Publication Date: 2008-12-10
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method mainly carries out effective iodine separation to low-iodine underground brine (I: 20~30mg / L) that cannot be processed by other methods, and uses composite oxidant and sulfur dioxide as production raw material additives, so it is more convenient and safe; The problem of waste discharge and environmental pollution is provided, and a new raw material for iodine production is provided, so that waste can be turned into treasure, and at the same time, it can overcome the technical problems existing in the existing technology

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0013] Embodiment 1 of the present invention: extract iodine from iodine-containing underground brine, wherein the iodine content in the underground brine is: 20mg / L, pH: 5.5 adjust the pH of the underground brine to 3, add 0.01 kg of compound in 100 kg of this underground brine The proportion of oxidant and composite oxidant is 27-35% of hydrogen peroxide, 0.1-0.2% of vanadium pentoxide, and the rest is water. Mix for 5 minutes to carry out oxidation reaction, and then blow out the molecular iodine with hot air at 60 degrees Celsius. The volume ratio of hot air and liquid is 130:1, and then use SO 2 When the iodine content in the obtained liquid reaches 100g / L, add 0.5 kg of hydrogen peroxide per 100 kg of the obtained liquid to precipitate the iodine, filter and centrifuge, and refine to obtain the finished iodine.

Embodiment 2

[0014] Embodiment 2 of the present invention: extract iodine from iodine-containing underground brine, wherein the iodine content in the underground brine is: 30mg / L, pH: 5.5 adjust the pH of the underground brine to 4, add 1 kg of iodine in 1000 kg of this underground brine Composite oxidant, the proportion of composite oxidant is 1 kg of 30% hydrogen peroxide, add 20 grams of vanadium pentoxide, mix for 10 minutes to carry out oxidation reaction, then blow out the molecular iodine with hot air at 70 degrees Celsius, blowing hot air and liquid volume ratio is 150:1, then use SO 2 When the iodine content in the obtained liquid reaches 100g / L after the acidic solution is circulated and absorbed, add 0.5 kg of hydrogen peroxide to every 100 kg of the obtained liquid to precipitate iodine, filter and centrifuge, and refine to obtain the finished iodine.

Embodiment 3

[0015] Embodiment 3 of the present invention: Extract iodine from iodine-containing underground brine, wherein the iodine content in the underground brine is: 30mg / L, pH: 4.5. Add 0.1 kg of composite oxidant in 100 kilograms of this underground brine, the proportioning of composite oxidant is 35% hydrogen peroxide, 0.2% vanadium pentoxide, and the remainder is water, mix for 5 minutes and carry out oxidation reaction, then use 65 degrees Celsius heat Air blows out the molecular iodine therein, and the volume ratio of the hot air blown to the liquid is 250:1, and then the SO 2 When the iodine content in the obtained liquid reaches 100g / L after the acidic solution is circulated and absorbed, add 0.5 kg of hydrogen peroxide to every 100 kg of the obtained liquid to precipitate iodine, filter and centrifuge, and refine to obtain the finished iodine.

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PUM

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Abstract

The invention discloses a method for extracting iodine from iodine-containing subsurface brine; the content of iodine in the subsurface brine is 20-30mg / L, compound oxidant is added in the subsurface brine as oxidant for oxidation reaction, air is used for blowing molecular iodine out, then SO2 acidic solution is used for absorbing, the pH value of absorption liquid is between 1-6, then hydrogen peroxide is added to separate iodine out and filtration and separation are carried out to obtain finished iodine. The subsurface brine with iodine content of 20-30 mg / L is usually selected as raw material for extracting iodine; the compound oxidant of the invention can improve the efficiency of oxidant; proved by tests, after the hydrogen peroxide is added with vanadic oxide, the dosage of oxidant can be reduced by 30%. Therefore, the method and the compound oxidant proposed by the applicant after tests can extract the iodine with low content and can expand the select range of the raw materials for extracting iodine.

Description

Technical field: [0001] The invention relates to a method for extracting iodine from underground brine containing iodine, and belongs to the technical fields of iodine extraction, environmental protection and chemical industry. Background technique: [0002] At present, most industrial iodine manufacturers in my country use high-grade iodide-containing brine, brine, or kelp soaking solution (iodine content: 200-300mg / L) as raw materials to produce industrial iodine. Most of the processes used are ion exchange resin methods. That is to say, the high-grade iodide-containing bittern, brine, or kelp soaking liquid is acidified with acid, and chlorine gas is introduced to make iodine free and precipitate, and then adsorbed by polystyrene ion exchange resin. There are two methods of desorption: one is elution with sulfite solution, and then potassium chlorate is used to precipitate iodine, centrifuged, and crude iodine is melted and refined by sulfuric acid; the other is elution wi...

Claims

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Application Information

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IPC IPC(8): C01B7/14
Inventor 陈肖虎柳玉松樊囿宇王景峰陈庆刘辉黄光柱查少华杨善志
Owner WENGFU (GRP) CO LTD
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