Preparation method of anti-blocking strontium chloride

A strontium chloride, anti-caking technology, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve problems such as easy agglomeration, achieve difficult agglomeration, inhibit bad crystallization, reduce The effect of supersaturation

Active Publication Date: 2012-10-03
重庆新申世纪新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method fails to solve the problem of agglomeration from the crystal form of strontium chloride. The crystal form of strontium chloride in the natural crystallization process is needle-like crystal form, and because strontium chloride is easy to form larger Therefore, the obtained products are mostly fine needle-like crystals, and such products are still easy to agglomerate during storage and transportation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of anti-caking strontium chloride, comprising the steps of:

[0029] (1) Add industrial strontium carbonate and industrial hydrochloric acid into the reaction kettle for reaction, the molar ratio of industrial strontium carbonate to industrial carbonic acid is 2.1:1;

[0030] (2) The solution obtained in step (1) is oxidized with hydrogen peroxide, added sulfuric acid to remove barium, adjusted pH to remove iron, calcium and heavy metal ions, and after removing impurities, adjust the pH value of the solution to between 2-3, and then concentrate to saturation;

[0031] (3) Put the concentrated solution through step (2) into the crystallization tank, add 4% (weight ratio) of finished product strontium chloride as seed crystals, and add 0.2% (weight ratio) of acetic acid as Crystal form control agent, stir and slowly cool down to crystallize;

[0032] (4) Centrifuge the crystals obtained in step (3), and wash them with pure water at 0-5°C;

[0033] ...

Embodiment 2

[0037] (1) Add industrial strontium carbonate and industrial hydrochloric acid into the reaction kettle for reaction, the molar ratio of industrial strontium carbonate to industrial carbonic acid is 2.1:1;

[0038] (2) The solution obtained in step (1) is oxidized with hydrogen peroxide, added sulfuric acid to remove barium, adjusted pH to remove iron, calcium and heavy metal ions, and after removing impurities, adjust the pH value of the solution to between 2-3, and then concentrate to saturation;

[0039] (3) Put the concentrated solution concentrated in step (2) into a crystallization tank, add 5% (weight ratio) of finished product strontium chloride as seed crystals, and add 0.5% (weight ratio) of acetic acid as Crystal form control agent, stir and slowly cool down to crystallize;

[0040] (4) Centrifuge the crystals obtained in step (3), and wash them with pure water at 0-5°C;

[0041] (5) Drying the centrifuged product in step (4) until the free water content in the st...

Embodiment 3

[0045] (1) Add industrial strontium carbonate and industrial hydrochloric acid into the reaction kettle for reaction, the molar ratio of industrial strontium carbonate to industrial carbonic acid is 2.1:1;

[0046] (2) The solution obtained in step (1) is oxidized with hydrogen peroxide, added sulfuric acid to remove barium, adjusted pH to remove iron, calcium and heavy metal ions, and after removing impurities, adjust the pH value of the solution to between 2-3, and then concentrate to saturation;

[0047] (3) Put the concentrated solution through step (2) into a crystallization tank, add 6% (weight ratio) of finished product strontium chloride as seed crystals, and add 0.6% (weight ratio) of acetic acid as Crystal form control agent, stir and slowly cool down to crystallize;

[0048] (4) Centrifuge the crystals obtained in step (3), and wash them with pure water at 0-5°C;

[0049] (5) Drying the centrifuged product in step (4) until the free water content in the strontium ...

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PUM

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Abstract

The invention discloses a preparation method of anti-blocking strontium chloride, which comprises the following steps: adding industrial strontium carbonate and industrial hydrochloric acid in a reaction kettle for reaction; regulating the PH value of impurity-removed solution to 2 to 3; concentrating; centrifuging; and drying and the like for packing strontium chloride; and obtaining a strontium chloride product. The seed crystal preparation is carried out before strontium chloride is crystallized, excessive strontium chloride and a small amount of acetic acid are added, the added strontium chloride serves as a seed crystal in the solution to ensure that larger-particle crystals are obtained, a small amount of acetic acid can change the crystal type of the strontium chloride crystal, so that the crystallization supersaturation is reduced, the large cubic crystals are beneficial for being obtained, and the formation of poor crystals such as cluster crystals can be inhabited. After drying treatment, the strontium chloride product stacked for a long time without blockage can be obtained.

Description

technical field [0001] The invention relates to a preparation process of strontium chloride, in particular to a preparation method of anti-caking strontium chloride. [0002] Background technique [0003] Strontium chloride is an important inorganic fine chemical product. It can be used as an electrolyte flux to produce fireworks and other strontium salt raw materials, metal strontium and strontium alloy electrolysis raw materials, and used in TFT-LCD liquid crystal, PDP plasma color TV. Strontium chloride is a white needle-like crystal, which is easy to absorb moisture in the air and is easily soluble in water. Since strontium chloride itself contains 6 crystal waters and is easy to absorb moisture, it will dissolve in its own crystal when the temperature is higher than 60°C Due to the characteristics of water, strontium chloride products prepared by conventional preparation methods have the defects of insufficient drying, serious agglomeration and short storage time of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/28
Inventor 申静何从林
Owner 重庆新申世纪新材料科技有限公司
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