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Method for extracting iodine from iodine-containing solution

An iodine solution and a technology for extracting iodine, which is applied in the field of iodine extraction, can solve the problems of short stable operation time of the extraction tower, and the sieve plate is easily blocked by impurities, and achieve the effects of simple equipment, high recovery rate of iodine, and low energy consumption

Active Publication Date: 2015-10-07
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 [The comparisons described in the present invention all refer to the volume ratio of the organic phase and the water phase, and will not be specified one by one]

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

Embodiment 2

[0029] A method for extracting iodine from an iodine-containing solution, wherein the iodine-containing solution is a kelp blanching solution, the iodine content in the solution is 704 mg / L, and the pH is adjusted to 1.0 with 30wt% industrial hydrochloric acid, and 1 L of the solution is taken, Add 0.48g sodium nitrite to it, oxidize for 3 hours; then add 1L mineral oil to the reaction solution at a ratio of 1:1, heat to 40 ° C, stirring speed is 500 rev / min, extraction time 30min, after detection of the first grade The extraction rate was 86.1%; 18wt% sodium hydroxide solution was added to the obtained iodine-containing extract with a ratio of 200:1, and then the back-extraction operation was carried out at 40°C and the stirring speed was 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 from back-extraction; the organic phase after back-e...

Embodiment 3

[0031] A method for extracting iodine from an iodine-containing solution, wherein the iodine-containing solution is a kelp blanching solution, the iodine content in the solution is 704 mg / L, the pH is adjusted to 1.5 with 40wt% industrial hydrochloric acid, and 1 L of the solution is taken, Add 0.48g sodium nitrite to it, oxidize for 4 hours; then add 333mL mineral oil to the reaction solution at a ratio of 1:3, heat to 45°C, stir at 300 rpm, extraction time 40min, six-stage countercurrent extraction The extraction rate was 98.4%; 18wt% sodium hydroxide solution was added to the obtained iodine-containing extract at a ratio of 22.2:1, and then the back-extraction operation was carried out at 45°C and a stirring speed of 500 rpm. Extraction was carried out for 15 minutes, and the back-extraction method was cross-flow back-extraction. The number of back-extractions was 5 times, and the purple-red color of the organic phase disappeared after back-extraction. After the organic pha...

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PUM

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Abstract

The invention discloses a method for extracting iodine from an iodine-containing solution. The method comprises the following steps: adjusting the pH of the iodine-containing solution; adding an oxidant into the iodine-containing solution to be oxidized for certain time and adding an extracting agent into the oxidized solution; heating and stirring for certain time; adding a reverse extraction agent into a loaded organic phase to be subjected to reverse extraction; after the reverse extraction, carrying out water washing treatment on the organic phase; and acidifying a water phase after the reverse extraction to separate crude iodine. According to the method disclosed by the invention, an oxidization-extraction method is adopted so that the method has the advantages of high extraction rate, simple equipment, low energy consumption and the like. The extraction rate of the iodine is more than 93 percent and the extraction agent can be repeatedly used.

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 and is widely used in national defense, industry and agriculture, medical and health care and other fields. With the rapid development of the economy, the demand for iodine in my country has greatly increased. Due to the limitation of iodine resources and recovery technology, the total output of iodine in my country is relatively low, and the production cost is relatively high. Every year, a large amount of iodine needs to be imported from abroad. 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 are large, as high as 70 billion tons. The main sources of industrial iodine extrac...

Claims

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Application Information

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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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