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Method for extracting iodine from iodine-containing fluosilicic acid

A technology for extracting iodine and fluosilicic acid, which is applied in the field of iodine extraction, and can solve problems such as high production and operation costs, high requirements for iodine content in raw materials, and iodine loss

Active Publication Date: 2008-12-17
WENGFU (GRP) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two major problems in this method: the one is that the production operation cost is high, and the 2nd, the production process requires high iodine content to raw materials (brine containing iodide, brine, or kelp soaking liquid)
[0004] Fluosilicic acid is a by-product obtained from the concentration process of dilute phosphoric acid in the production process of phosphoric acid. After the existing fluosilicic acid solution is further processed, iodine is directly lost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1 of the present invention: extract iodine from iodine-containing fluosilicic acid solution, wherein the content of iodine in the fluosilicic acid solution is: 50~110mg / L, the total acidity of fluosilicic acid is 15~25%, at every 100 Add 0.05 kg of composite oxidant to the fluorosilicic acid solution, the proportion of composite oxidant is 27-35% hydrogen peroxide, 0.1-0.2% vanadium pentoxide, and the rest is water, that is, add 0.1-0.2% hydrogen peroxide % vanadium pentoxide. Mix for 5 minutes to carry out the oxidation reaction, then blow out the molecular iodine with hot air at 40 degrees Celsius, the volume ratio of the hot air blown to the liquid is 130:1, and then use 2 When the iodine content in the obtained liquid reaches 100g / L, add 5 kilograms of 27.5% hydrogen peroxide in every 100 L of obtained liquid to precipitate iodine, filter and centrifuge, and obtain finished iodine through refining.

Embodiment 2

[0013] Embodiment 2 of the present invention: extract iodine from iodine-containing fluorosilicic acid, wherein the content of iodine in the fluorosilicic acid solution is: 80mg / L, and the total acidity of the fluorosilicic acid is 18%. Add 0.1 kg of composite oxidant to the solution, the proportion of composite oxidant is 30% hydrogen peroxide, 0.2% vanadium pentoxide, and the rest is water, mix for 30 minutes for oxidation reaction, and then blow out the molecules with hot air at 40 degrees Celsius Iodine, the volume ratio of the hot air blown and the liquid is 150: 1, then absorb with SO2 acidic solution circulation, when the content of iodine in the obtained liquid reaches 150g / L, add 27.5% hydrogen peroxide 8.2 in the liquid obtained in every 100L kg to precipitate iodine, filter and centrifuge, and refine to obtain finished iodine.

Embodiment 3

[0014] Embodiment 3 of the present invention: extract iodine from iodine-containing fluorosilicate solution, wherein the content of iodine in the fluorosilicate solution is: 100mg / L, the total acidity of fluorosilicate is 20%, in every 100 kilograms of this fluorosilicate Add 0.1 kg of composite oxidant to the acid solution, the proportion of which is 0.1 kg of 35% hydrogen peroxide, add 2 grams of vanadium pentoxide, mix for 10 minutes to carry out oxidation reaction, the time of oxidation reaction is controlled at 10-20 Minutes can not only ensure sufficient oxidation reaction, but also control production time and reduce production cost. Then use 40 degrees Celsius hot air to blow out the molecular iodine, the volume ratio of the hot air to the liquid is 150:1, and then use SO 2 When the iodine content in the obtained liquid reaches 150g / L, add 7 kg of hydrogen peroxide per 100L of the obtained liquid to precipitate iodine, filter and centrifuge, and refine to obtain finishe...

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PUM

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Abstract

The invention discloses a method for extracting iodine from fluosilicic acid containing the iodine; the method comprises the following steps of: extracting the iodine from the fluosilicic acid solution produced in the production process of the phosphoric acid, wherein, the fluosilicic acid contains 50 to 110 mg / L of the iodine and the total acidity of the fluosilicic acid is 15 percent to 25 percent; adding a compound oxidizing agent into the fluosilicic acid and oxidizing the ion iodine in the solution into molecular iodine; using air to blow out the molecular iodine; absorbing the moleculariodine by using the acid solution containing SO2 with the PH value of the absorbing liquid ranging from 1 to 6; adding hydrogen peroxide and leading the iodine to be precipitated; carrying out filtering and separation and obtaining the finished iodine. The raw material for extracting the iodine by the invention is fluosilicic acid, in which the content of the iodine is usually below 100mg / L. The method and the compound oxidizing agent obtained by the applicant by experiments can carry out extraction to the iodine with low content. The invention expands the selecting range of extracting the material of the iodine.

Description

Technical field: [0001] The invention relates to a method for extracting iodine from iodine-containing fluorosilicate, belonging to the technical fields of iodine extraction, environmental protection and chemical industry. Background technique: [0002] At present, most of the 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 adopted processes 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 eluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/14
Inventor 刘辉陈肖虎田言樊囿宇姜庆泉陈庆杨丽萍查少华杨善志雷学联杨毅
Owner WENGFU (GRP) CO LTD
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