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A kind of preparation technology of high-purity anhydrous sodium iodide powder

A preparation process and technology of sodium iodide, applied in the purification of alkali metal iodide and alkali metal halide, etc., can solve the problem of affecting optical properties, low bulk density of anhydrous sodium iodide powder, and anhydrous sodium iodide powder. The problem of uneven particle size distribution, etc., achieves the effect of simple process, low production cost and unique process route.

Active Publication Date: 2020-11-13
涞水县燕南精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purity of sodium iodide prepared by the traditional sodium iodide process is revealed, and the content of impurity potassium element is high, which is difficult to remove, which seriously affects its optical properties. At the same time, the particle size distribution of the anhydrous sodium iodide powder prepared by the traditional process is not Uniformity, so that the bulk density of anhydrous sodium iodide powder is low, which increases the production cost and optical performance of sodium iodide powder processed into optical devices

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of preparation technology of high-purity anhydrous sodium iodide powder, comprises the following steps:

[0028] (1) Take by weighing 200 kilograms of iodine, 250 kilograms of sodium bicarbonate, place it in 200 kilograms of water after mixing, fully stir to obtain mixed solution 1;

[0029] (2) Add 24 kilograms of hydrazine hydrate in mixed solution one, obtain mixed solution two after mixing;

[0030] (3) React the mixed solution 2 at a temperature of 50° C. for 1 hour to obtain a mixed solution 3 with a pH of 6.5;

[0031] (4) Add sodium hydroxide solution to the mixed solution 3, adjust the pH value of the mixed solution to 9, and keep the temperature at 100° C. for 8 hours to obtain the mixed solution 4;

[0032] (5) Add HI solution to the mixed solution 4, adjust the pH of the mixed solution to 3, and incubate at 75° C. for 4 hours;

[0033] (6) Add sodium hydroxide solution to the solution after step (5) insulation finishes, adjust the pH of mixed soluti...

Embodiment 2

[0039] A kind of preparation technology of high-purity anhydrous sodium iodide powder, comprises the following steps:

[0040] (1) Take by weighing 180 kilograms of iodine, 230 kilograms of sodium bicarbonate, place it in 180 kilograms of water after mixing, fully stir to obtain mixed solution 1;

[0041] (2) Add 20 kilograms of hydrazine hydrate in mixed solution one, obtain mixed solution two after mixing evenly;

[0042] (3) reacting the mixed solution 2 at a temperature of 40° C. for 2 hours to obtain a mixed solution 3 with a pH of 7;

[0043] (4) Add sodium hydroxide solution to the mixed solution 3, adjust the pH value of the mixed solution to 10, and keep the mixture at 100° C. for 8 hours to obtain the mixed solution 4;

[0044] (5) Add HI solution to the mixed solution 4, adjust the pH of the mixed solution to 4, and incubate at 70° C. for 4 hours;

[0045] (6) add sodium hydroxide solution in the solution after step (5) insulation finishes, adjust the pH of mixed ...

Embodiment 3

[0051] A kind of preparation technology of high-purity anhydrous sodium iodide powder, comprises the following steps:

[0052] (1) Take by weighing 220 kilograms of iodine, 270 kilograms of sodium bicarbonate, place it in 210 kilograms of water after mixing, fully stir to obtain mixed solution 1;

[0053] (2) Add 30 kilograms of hydrazine hydrate in mixed solution one, obtain mixed solution two after mixing;

[0054] (3) React the mixed solution 2 at a temperature of 50° C. for 0.5 h to obtain a mixed solution 3 with a pH of 6.5;

[0055] (4) Add sodium hydroxide solution to the mixed solution 3, adjust the pH value of the mixed solution to 10, and keep the mixture at 100° C. for 8 hours to obtain the mixed solution 4;

[0056] (5) Add HI solution to the mixed solution 4, adjust the pH of the mixed solution to 4, and incubate at 70° C. for 4 hours;

[0057] (6) add sodium hydroxide solution in the solution after step (5) insulation finishes, adjust the pH of mixed solution t...

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PUM

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Abstract

The invention provides a preparation process of high purity anhydrous sodium iodide powder. The process includes: putting iodine and sodium bicarbonate in water to prepare a mixed solution, then adding hydrazine hydrate, a sodium hydroxide solution, an HI solution and a sodium hydroxide solution into the mixed solution in order for treatment, and then removing impurities and performing concentration, and carrying out centrifugal separation to obtain sodium iodide powder, and finally subjecting hydrogen iodide powder to recrystallization treatment with anhydrous ethanol to obtain the high purity anhydrous sodium iodide powder, which has an impurity K content of less than 2ppm and an apparent density of 2.4-2.6g / mL. The process provided by the invention has the characteristics of unique technology, low cost, high product purity and apparent density, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to a preparation process of sodium iodide, in particular to a preparation process of utilizing iodine and sodium bicarbonate to prepare high-purity sodium iodide. Background technique [0002] Anhydrous sodium iodide is a white powder with a chemical formula of NaI. It has a wide range of uses. Using the excellent optical properties of sodium iodide, it can be well matched with the photocathode of the photomultiplier tube to prepare optical devices with high luminous efficiency. The optical device has no obvious self-absorption in the luminescent wavelength band, has good resolution ability for X-rays and γ-rays, and has little temperature effect. With the performance and low price of sodium iodide, it is widely used in oil exploration, security inspection, environmental monitoring and other fields. [0003] The purity of sodium iodide prepared by the traditional sodium iodide process is revealed, and the content of impurity pota...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/12C01D3/14
CPCC01D3/12C01D3/14C01P2006/80C01P2006/90
Inventor 郭家锐张宏阳
Owner 涞水县燕南精细化工有限公司