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Method for extracting iodine from kelp

A technology for extracting iodine and kelp, applied in the field of extracting iodine, can solve problems such as difficulty in removing small molecular organic impurities, and achieve the effects of improving the yield of iodine, improving the adsorption effect, and improving the yield of iodine.

Active Publication Date: 2013-05-01
QINGDAO BRIGHT MOON SEAWEED GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the methods for extracting iodine from kelp in the prior art, the present invention provides a method for extracting iodine from kelp, which can effectively purify the kelp soaking liquid and solve the problem of small molecule organic matter in the kelp soaking liquid. Difficult to remove impurities

Method used

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Embodiment 1

[0024] The method for extracting iodine from kelp of the present invention comprises the following steps:

[0025] 1. Select the dried kelp that is aired, weigh 100Kg and soak it in the way of secondary soaking, put the above-mentioned dried kelp into the secondary soaking solution and spread it evenly, soak for 90 minutes, and the obtained kelp soaking solution is used for step 2 treatment. Add 1200 Kg of tap water to the sea-tangle after the above-mentioned first soaking and soak for the second time. The soaking time is 30 minutes. The liquid after soaking is the second soaking liquid for the next dry sea-tangle soaking.

[0026] 2. The kelp soaking liquid obtained is purified through the following steps:

[0027] (1) Add calcium oxide to adjust the pH value to 8.0, centrifuge and inflate at the same time, let it stand for 1 hour, separate impurities such as scum in the upper layer and sediment settled at the bottom, and take the first clear liquid;

[0028] (2) Add sodium ...

Embodiment 2

[0036] The method for extracting iodine from kelp of the present invention comprises the following steps:

[0037] 1. Choose fresh kelp, weigh 500 Kg, put the above fresh kelp into the secondary soaking solution and spread it evenly, soak for 60 minutes, the obtained kelp soaking solution is used for step 2, add 3000 Kg of tap water to the kelp after soaking once Soak for the second time, the soaking time is 30 minutes, and the liquid after soaking is used for the fresh kelp soaking next time.

[0038] 2. The obtained kelp soaking liquid is purified through the following steps:

[0039] (1) Add calcium hydroxide to adjust the pH value to 8.0, and carry out continuous air flotation at the same time to separate impurities such as scum in the upper layer and sediment settled at the bottom, and take the first clear liquid;

[0040] (2) Add sodium hydroxide to the obtained first supernatant to adjust the pH value to 11.5, carry out continuous air flotation and separation at the sa...

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Abstract

The invention provides a method for extracting iodine from kelp. The method comprises the following steps of kelp immersion, kelp immersion liquid purification, acidification oxidation conversion into dissociative iodine, adsorption by a resin, reduction desorption and iodine oxidation precipitation. Concretely, the method comprises the following steps of preparing an immersion liquid of kelp as a raw material, carrying out multistage reaction purification separation, adding calcium oxide or calcium hydrate into the immersion liquid subjected to purification separation for air floatation to remove water-soluble alginate and proteins which can react with calcium ions, adding an alkali into the immersion liquid treated by the previous step to remove alkaline insoluble substances such as fucoidin and water-insoluble impurities by air floatation separation under strong alkaline conditions, and adding an acid into the immersion liquid treated by the previous step to further remove acid-insoluble proteins by air floatation under acidic conditions. Through removal of the organic impurities, competitive adsorption of elemental iodine in resin adsorption is avoided and resin adsorption effects and an iodine yield are improved. Compared with the method for treating an immersion liquid only by a caustic soda solution, the method provided by the invention can effectively purify a kelp immersion liquid and improve an iodine yield.

Description

technical field [0001] The invention relates to a method for extracting iodine from kelp. Background technique [0002] Iodine is not only an essential element for the human body, but also one of the important inorganic chemical raw materials, which plays a decisive role in the national economy. At present, iodine is a scarce resource in the world. [0003] At present, countries with higher iodine production in the world include Japan, the United States, and Chile. In Chile, iodine is a by-product of the process of producing sodium nitrate from natural saltpeter. Japan's iodine production accounts for about 70% of the world and is the world's largest iodine-producing country. The raw materials of iodine produced in the United States mainly come from the oil and gas field brine from the exploitation of oil and natural gas, and the interlayer brine of salt lakes. [0004] my country is a country seriously deficient in iodine, and most of the iodine needs to be imported. S...

Claims

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Application Information

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IPC IPC(8): C01B7/16
Inventor 刘洪武安丰欣徐泽斌王磊周志华
Owner QINGDAO BRIGHT MOON SEAWEED GROUP
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