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A method for extracting iodine from iodine-containing solution

An iodine solution and a technology for extracting iodine, applied in the field of extracting iodine, can solve the problems of short stable operation time of an extraction tower, easy blockage of sieve plates by impurities, etc., and achieve the effects of simple equipment, high recovery rate of iodine and low energy consumption

Active Publication Date: 2017-10-20
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sieve plate used in this method is easily blocked by impurities, and the stable operation time of the extraction tower is relatively short.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 [comparisons described in the present invention all refer to the volume ratio of the organic phase and the aqueous phase, and are no longer specified one by one]

[0027] A method for extracting iodine from an iodine-containing solution, the iodine-containing solution is a kelp blanching solution, and the iodine content in the kelp blanching solution is 704 mg / L; its pH is adjusted to 1.0 with 30wt% industrial hydrochloric acid, and 1L of kelp is taken Add 0.45g of sodium nitrite to the blanching solution and oxidize it for 4 hours; then add 2L of mineral oil to the reaction solution at a ratio of 2:1, heat to 30°C, stir at 400 rpm, and extract for 30 minutes. After detection, the primary extraction rate is 89.5%; add 15wt% sodium hydroxide solution to the obtained iodine-containing extract with a ratio of 200:1, and then carry out stripping operation at 30 ° C and a stirring speed of 400 rpm , back extraction for 20min, the back extraction method is cross-flo...

Embodiment 2

[0029] A method for extracting iodine from an iodine-containing solution, the iodine-containing solution is a kelp blanching solution, the iodine content in the solution is 704mg / L, and its pH is adjusted to 1.0 with 30wt% industrial hydrochloric acid, and 1L of the solution is taken, Add 0.48g of sodium nitrite to it and oxidize for 3 hours; then add 1L of mineral oil to the reaction solution at a ratio of 1:1, heat to 40°C, stir at 500 rpm, and extract for 30 minutes. Extraction rate is 86.1%; Add 18wt% sodium hydroxide solution to the obtained iodine-containing extract with a ratio of 200:1, then carry out stripping operation at 40°C and a stirring speed of 300 rpm for 15min , the back-extraction method is counter-current back-extraction, the number of back-extraction stages is 8 times, and the purple-red color of the organic phase disappears after back-extraction; the organic phase after back-extraction is compared with 12:1 at room temperature, and after three-stage water ...

Embodiment 3

[0031] A method for extracting iodine from an iodine-containing solution, the iodine-containing solution is seaweed blanching liquid, the iodine content in the solution is 704mg / L, its pH is adjusted to 1.5 with 40wt% industrial hydrochloric acid, and 1L of the solution is taken, Add 0.48g of sodium nitrite to it and oxidize for 4 hours; then add 333mL of mineral oil to the reaction solution according to the ratio of 1:3, heat to 45°C, stir at 300 rpm, extract for 40min, and perform six-stage countercurrent extraction The extraction rate of 98.4%; Add 18wt% sodium hydroxide solution in the iodine-containing extract solution that obtains with comparing 22.2:1, then carry out stripping operation under the condition of 500 revs / min at 45 ℃, stirring speed, reverse Extraction for 15 minutes, the back extraction method is cross-flow back extraction, the number of back extraction is 5 times, and the purple red color of the organic phase disappears after back extraction; the organic p...

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Abstract

The invention discloses a method for extracting iodine from an iodine-containing solution, which comprises adjusting the pH of the iodine-containing solution, adding an oxidant to the iodine-containing solution for oxidation for a certain period of time, adding an extractant to the oxidized solution, heating and stirring for a certain period of time, adding A stripping agent is added to the loaded organic phase for stripping. After stripping, the organic phase is washed with water. After stripping, the aqueous phase is acidified to precipitate crude iodine. The invention adopts an oxidation-extraction method, which has the advantages of high extraction rate, simple equipment and low energy consumption. The extraction rate of iodine reaches over 93%, and the extractant can be used repeatedly.

Description

technical field [0001] The invention relates to the technical field of environmental protection chemical industry for extracting iodine. More specifically, it relates to a method for extracting iodine from an iodine-containing solution. Background technique [0002] Iodine is an important strategic material, which is widely used in national defense, industry and agriculture, medical and health, etc. With the rapid development of the economy, my country's demand for iodine has greatly increased. Due to the limitation of iodine resources and recovery technology, the total output of iodine in my country is low, and the production cost is high. It is necessary to import a large amount of iodine from abroad every year. Iodine is distributed all over the world, but there are few iodine resources that can be exploited. The total reserves of iodine in the ocean is very large, up to 70 billion tons. The main sources of industrial iodine extraction in my country include kelp blanch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/14C01B7/16
Inventor 魏琦峰任秀莲董慧栓陈泳兴郭敬敬鞠辉李超李耀武
Owner HARBIN INST OF TECH AT WEIHAI
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