Removal of minim iodine ion from brine liquor which is material of caustic soda produced by ion membrane method

A technology of iodide ion and brine, applied in the direction of alkali metal compounds, alkali metal hydroxides, alkali metal oxides/hydroxides, etc., can solve the problems of high operating cost, large amount of regeneration liquid, difficult to recycle, etc., and achieve operating cost Low, long operating cycle, easy to recycle effect

Inactive Publication Date: 2006-07-26
XINWEN MINING GROUP +1
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Problems solved by technology

[0002] At present, the raw materials used in soda production by ionic membrane method include industrial salt, raw brine plus brine and whole brine. The whole brine soda production is valued by all countries in the world because of its low cost and simple process, but the original brine often contains a relatively high amount of iodine Compounds, these iodides will precipitate in the form of iodate during electrolysis, resulting in reduced current efficiency and shortened ion membrane life. The data show that when I - When the content is greater than 0.4mg/L (or even 0.2mg/L), the life of the ionic membrane will be greatly reduced. There is no good s

Method used

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  • Removal of minim iodine ion from brine liquor which is material of caustic soda produced by ion membrane method

Examples

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Example Embodiment

[0013] (1) Example 1.

[0014] The original brine of Xinwen Mining Group Taishan Salt Chemical Industry is used, and the original brine contains 0.21mg / L of iodine. Add acid to adjust pH=2, add 400ml oxidant, oxidation time is 120min, and the iodine content of brine after treatment is 0.035mg / L.

Example Embodiment

[0015] (2) Example 2

[0016] The original brine of Xinwen Mining Group Taishan Salt Chemical Industry is used, and the original brine contains 0.21mg / L of iodine. Add acid to adjust pH=4, add 400ml oxidant, oxidation time is 120min, and the iodine content of brine after treatment is 0.034mg / L.

Example Embodiment

[0017] (3) Example 3

[0018] The original brine of Xinwen Mining Group Taishan Salt Chemical Industry is used, and the iodine content of the original brine is 0.17mg / L. Add acid to adjust pH=6, add 400ml oxidant, oxidation time is 60min, and the iodine content of brine after treatment is 0.038mg / L.

[0019] (4) Embodiment 4

[0020] The original brine of Xinwen Mining Group Taishan Salt Chemical Industry is used, and the original brine contains 0.21mg / L of iodine. Add acid to adjust pH=6, add 5ml of oxidant, oxidation time is 60min, and the iodine content of brine after treatment is 0.039mg / L.

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Abstract

The removing method for micro iodine ion in brine comprises: in acid condition, using one or more of H2O2, NaClO, FeCl3, and NaClO3 as oxidant to oxygenate the I- into I2; using one or more of active carbon, molecular sieve, carclazyte and diatomite as sorbent for adsorption. This invention reduces the iodine-content from 0. 1-5mg/L to less than 0. 05mg/L and meets the production request (less than 0. 2mg/L) for NaOH with ion film method.

Description

Technical field [0001] The utility model relates to a method for removing trace amounts of iodide ions in brine as a raw material of ion-exchange membrane caustic soda. Background technique [0002] At present, the raw materials used in soda production by ionic membrane method include industrial salt, raw brine plus brine and whole brine. The whole brine soda production is valued by all countries in the world because of its low cost and simple process, but the original brine often contains a relatively high amount of iodine Compounds, these iodides will precipitate in the form of iodate during electrolysis, resulting in reduced current efficiency and shortened ion membrane life. The data show that when I - When the content is greater than 0.4mg / L (or even 0.2mg / L), the life of the ionic membrane will be greatly reduced. There is no good solution to this problem. The article QUALITY: REMOVAL OF BROMIDE, IODIDE AND CHLORATE' introduces a method of using anion resin to remove ...

Claims

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Application Information

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IPC IPC(8): C01D1/04C01D1/28C01D1/36C01D1/32
Inventor 吴刚李保山侯光胜徐洪涛亓宾奎张新良
Owner XINWEN MINING GROUP
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