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Method for preparing iodized salt from iodine-contained absorption solution

A technology of absorbing liquid and iodized salt, applied in the preparation of iodide, alkali metal iodide, calcium/strontium/barium halide, etc., to achieve the effect of saving energy, shortening the process flow and good quality

Active Publication Date: 2013-08-07
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this method is simple, and the choice of reducing agent is the key to the reaction. However, iodate may also exist in the reaction product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 820mL of iodine absorption solution and put it into a 1000mL beaker, add 2.1215g of anhydrous sodium sulfite under stirring, at this time the color of the solution becomes colorless, take 20mL of colorless liquid, titrate with 0.1mol / L silver nitrate solution, and measure the concentration of the absorption solution. The iodide ion content is 20.0212g / L; add 11.2390g of barium carbonate in batches to the absorption liquid, stir, and filter after the reaction. Add 6.1011g of lithium carbonate to the filtrate, after the reaction, transfer to a 1000mL three-neck flask, concentrate under reduced pressure, cool and crystallize to obtain 10.0080g of lithium iodide trihydrate, the product yield is 32.78%.

Embodiment 2

[0019] Take 810mL of iodine absorption solution and put it into a 1000mL beaker, add 3.5623g of anhydrous sodium sulfite under stirring, at this time the color of the solution becomes colorless. Take 10mL of colorless liquid, titrate with 0.1mol / L silver nitrate solution, and measure the iodide ion content in the absorption liquid to be 35.8963g / L. Add 13.5394 g of barium carbonate in batches to the absorption liquid, stir, and filter after the reaction. Add 11.3148g of calcium carbonate to the filtrate. After the reaction, transfer it into a 1000mL three-necked flask, concentrate under reduced pressure, cool and crystallize to obtain 10.2347g of calcium iodide hydrate, and the product yield is 35.64%.

Embodiment 3

[0021] Take 810mL of iodine absorption solution and put it into a 1000mL beaker, add 4.8634g of anhydrous sodium sulfite under stirring, at this time the color of the solution becomes colorless. Take 10mL of colorless liquid, titrate with 0.1mol / L silver nitrate solution, and measure the iodide ion content in the absorption liquid to be 42.3697g / L. Add 15.5764 g of barium carbonate in batches to the absorption liquid, stir, and filter after the reaction. Add 14.9580g of potassium hydroxide to the filtrate. After the reaction, transfer it into a 1000mL three-necked flask, concentrate under reduced pressure, cool and crystallize to obtain 17.2683g of potassium iodide, and the product yield is 38.97%.

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Abstract

The invention discloses a method for preparing iodized salt from iodine-contained absorption solution, which comprises the following operation steps of: reducing a free iodine elementary substance in the iodine-contained absorption solution into an iodide ion with a reducing agent, adding an appropriate amount of barium carbonate to convert a sulfate ion in a solution system into barium sulfate and adding alkali or salt being capable of reacting with hydroiodic acid into a filtrate after filtration to obtain required iodized salt solution; and obtaining the corresponding iodized salt in concentration and crystallization manners. The method has the beneficial effects that the complicated process of preparing the iodized salt by utilizing iodine is avoided, the process flow is shortened, and meanwhile, a large quantity of energy sources can be saved; intermediate body hydroiodic acid is taken as a raw material to prepare the iodized salt by utilizing an iodine recovery process, the raw material is easily obtained, and obtained mother liquid after concentration and crystallization can be directly returned to an iodine recovery device, so that the sources are reasonably recycled; and the preparation process of the iodized salt is simple, and products after concentration and crystallization have good quality and high product yield.

Description

technical field [0001] The present invention relates to the preparation of iodized salt in the chemical industry, namely relates to the method for preparing iodized salt from iodine-containing absorption liquid; Proceed to prepare iodized salt. Background technique [0002] Phosphate rocks of marine sedimentary rock type generally contain a certain amount of iodine. The United States, Morocco, the former Soviet Union and other countries began to study it in the 1950s, but because of the long process and high production costs, Industrial production has never been realized. my country began to study the extraction of iodine from phosphate rocks in the 1970s. In 1973, Sichuan successfully separated iodine from phosphate rocks. However, due to the complicated process and high cost, industrial production has not been realized. [0003] Wengfu Group Co., Ltd. and Guizhou University have successfully developed the technology of extracting iodine from phosphate rock associated iod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B9/06C01D15/04C01F11/20C01D3/12
Inventor 何浩明解田贾双珠史春英
Owner WENGFU (GRP) CO LTD
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