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Method for measuring iodine content in iodine absorption circulating liquid

A technology of absorption cycle and iodine content, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem of lack of iodine circulation absorption liquid analysis and determination method of iodine content. , to achieve the effect of improving precision and accuracy, good repeatability and reproducibility, and stable analysis results

Inactive Publication Date: 2013-10-23
GUIZHOU KAILIN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method for measuring the iodine content in the iodine absorption circulating liquid, which solves the problem of lack of iodine circulating absorption liquid iodine content analysis and determination method in the prior art

Method used

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  • Method for measuring iodine content in iodine absorption circulating liquid
  • Method for measuring iodine content in iodine absorption circulating liquid
  • Method for measuring iodine content in iodine absorption circulating liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] (1) Accurate sampling and dilution:

[0078] Sampling the circulating liquid produced by the process of extracting iodine with wet phosphoric acid from the absorption circulation tank to be determined, accurately weighed 0.4g of the fully mixed circulating liquid sample, accurate to 0.0001g, and added 80mL of it to a 250mL iodine measuring bottle Dilute with water, add 2mL of hydrochloric acid with a concentration of 1mol / L, shake well;

[0079] (2) Add saturated bromine water:

[0080] Add 14-16mL saturated bromine water and let stand for 5min;

[0081] (3) Add sodium formate solution and mix well:

[0082] Add 5 mL of sodium formate solution with a mass concentration of 10% to the solution obtained in step (2), mix well, and let it stand until the yellow color fades;

[0083] (4) Heat to boiling, add sodium fluoride solution after cooling:

[0084] Place the solution obtained in step (3) on an electric furnace and heat it to boiling for 2 minutes, then cool to roo...

Embodiment 2

[0094] (1) Accurate sampling and dilution:

[0095] Sampling the circulating liquid produced by the process of extracting iodine with wet-process phosphoric acid from the absorption circulation tank to be determined, accurately weighed 0.45g of the fully mixed circulating liquid sample, accurate to 0.0001g, and added 80mL of it to a 250mL iodine measuring bottle Dilute with water, add 2 mL of hydrochloric acid with a concentration of 1 mol / L, and shake well;

[0096] (2) Add saturated bromine water:

[0097] Add 14.5mL saturated bromine water and let stand for 5min;

[0098] (3) Add sodium formate solution and mix well:

[0099] Add 5 mL of sodium formate solution with a mass concentration of 10% to the solution obtained in step (2), mix well, and let it stand until the yellow color fades;

[0100] (4) Heat to boiling, add sodium fluoride solution after cooling:

[0101] Place the solution obtained in step (3) on an electric furnace and heat it to boiling for 2.5 minutes, ...

Embodiment 3

[0111] (1) Accurate sampling and dilution:

[0112] Sampling the circulating liquid produced by the process of extracting iodine with wet-process phosphoric acid from the absorption circulation tank to be determined, accurately weighed 0.5g of the fully mixed circulating liquid sample, accurate to 0.0001g, and added 80mL of it to a 250mL iodine measuring bottle Dilute with water, add 3mL hydrochloric acid with a concentration of 1mol / L, shake well;

[0113] (2) Add saturated bromine water:

[0114] Add 15mL saturated bromine water and let stand for 5min;

[0115] (3) Add sodium formate solution and mix well:

[0116] Add 5 mL of sodium formate solution with a mass concentration of 10% to the solution obtained in step (2), mix well, and let it stand until the yellow color fades;

[0117] (4) Heat to boiling, add sodium fluoride solution after cooling:

[0118] Place the solution obtained in step (3) on an electric furnace and heat it to boiling for 2.5 minutes, then cool to...

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Abstract

The invention discloses a method for measuring iodine content in iodine absorption circulating liquid. The method comprises the following steps: (1) accurately sampling and diluting the sample; (2) adding saturated bromine water; (3) adding a sodium formate solution and uniformly mixing; (4) boiling the mixed solution, and adding a sodium fluoride solution after the mixed solution is cooled; (5) adding a potassium iodide solution, titrating the solution to baby blue through a standard sodium thiosulfate solution, adding a starch solution, and continuing titrating the solution through the standard sodium thiosulfate solution until the blue just fades; and (6) calculating the iodine content in the iodine absorption circulating liquid through a formula. The method provided by the invention is suitable for measuring the iodine content in the iodine absorption circulating liquid when recycling iodine through a wet phosphoric acid method, and the method is good in repeatability and reproducibility and stable in analysis result, and the error of parallel measurement results is not larger than 0.10%, thereby having a great significance for production guide of chemical industry.

Description

technical field [0001] The invention relates to a method for measuring iodine content in iodine absorption circulating fluid. Background technique [0002] With the development of industrial production and the improvement of requirements for cleaner production and resource reuse, the recovery technology for extracting iodine from phosphate rock has been continuously improved and has been put into production and application. For example, Chinese patent ZL200810302681.1 discloses a method for recovering iodine from dilute phosphoric acid produced by wet-process phosphoric acid, and Chinese patent ZL201120114927.X discloses a vacuum washing device for recovering iodine from dilute phosphoric acid. A method for extracting iodine when using phosphate rock as raw material to produce phosphoric acid. However, when recovering iodine from phosphoric acid produced by wet-process phosphoric acid, it is necessary to measure the iodine content in the iodine circulation absorption liquid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 赵先明宋斌汪洪罗焕勇
Owner GUIZHOU KAILIN GRP CO LTD
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