Analytical pure potassium iodide preparation method using waste liquid containing iodine

A technology of potassium iodide and waste liquid, applied in the direction of alkali metal iodide and the like, can solve the problems of easy sublimation of iodine element, high operation and storage requirements, etc., and achieve the effects of avoiding safety problems, low cost and high recovery rate.

Inactive Publication Date: 2017-03-22
WUXI YISHUIYUAN RESOURCE RECYCLING TECH CO LTD
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome that the existing iodine recovery technology can only process iodine-containing waste liquid in a single form, and the recovered product is simple iodine, which is easy to sublimate, and requires relatively high requirements for operation and storage in the recovery process. High defects, provide a method for the preparation and analysis of pure potassium iodide from iodine-containing waste liquid

Method used

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Embodiment

[0017] A method for preparing analytically pure potassium iodide from iodine-containing waste liquid, comprising the following steps:

[0018] 1), using sulfuric acid with a mass fraction of 20 to 40% to adjust the pH of the iodine-containing waste liquid to <2;

[0019] 2), detect IO in the waste liquid containing iodine 3 - concentration; according to n(IO 3 - ): n(Na 2 SO 3 )=1:3~3.5 in the amount of adding Na in the iodine-containing waste liquid 2 SO 3 , stir evenly;

[0020] 3), detect I in the iodine-containing waste liquid 2 content, and then according to n(I 2 ): n(Na 2 SO 3 )=1:1~1.2, add sodium sulfite and stir evenly;

[0021] 4), heating the iodine-containing waste liquid to 80°C, and stirring at constant temperature for 2 hours;

[0022] 5) According to the molar ratio of hydrogen peroxide and total iodine in the iodine-containing waste liquid is 2 to 3:1, add hydrogen peroxide, and absorb the generated purple iodine vapor with KOH aqueous solution. ...

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Abstract

The invention discloses an analytical pure potassium iodide preparation method using waste liquid containing iodine. The method comprises the steps of at first reducing all inorganic iodine of different forms in waste liquid containing iodine into iodide ions, using hydrogenperoxide as oxidant, under 80 DEG C oxidizing the iodide ions directly into iodine elements, subliming and overflowing, making sure that the iodine elements do not get oxidized further, breaking iodine clock reaction, after KOH absorbing iodine vapor, generating IO3<->, using hydrazine for reduction, making sure that no other impurity ions are introduced into potassium iodide solution, at last acquiring the analytical pure potassium iodide. The method is applicable for the treatment of waste liquid containing iodine of any forms and concentrations. The method has the advantages of being environment-friendly and economical, being simple and convenient to operate, low in cost, high in recyclability, and causing no secondary contamination during the whole process. The method can be used for the direct preparation of analytical pure potassium iodide, thus avoiding the safety problems of iodine storage and iodine vapor.

Description

technical field [0001] The invention relates to a method for recycling iodine-containing waste liquid, in particular to a method for preparing analytically pure potassium iodide from iodine-containing waste liquid. Background technique [0002] At present, the recovery of iodine from iodine-containing waste liquid mainly adopts methods such as oxidation method, reduction method, ion exchange method, air blowing method, flotation method, activated carbon adsorption method, extraction distillation and liquid film method to convert iodine in iodine-containing waste liquid into Crude iodine is recovered. Among them, the oxidation method, reduction method, air blowing method, activated carbon adsorption method, and extractive distillation method are based on converting all iodine in different states in the waste liquid into elemental iodine, and recovering iodine from the iodine-containing waste liquid due to the characteristics of easy sublimation of elemental iodine ; Ion adso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/12
CPCC01D3/12C01P2006/80
Inventor 潘正国张艳秋
Owner WUXI YISHUIYUAN RESOURCE RECYCLING TECH CO LTD
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