A kind of preparation method of gritty strontium chloride hexahydrate

A technology of strontium chloride hexahydrate and strontium chloride, applied in the field of strontium chloride, can solve the problems of long process time, poor economy, low efficiency and the like, and achieve the effects of simple process, improved anti-caking performance and easy filtration

Active Publication Date: 2016-03-23
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the whole process is time-consuming and economical
Chinese Patent Publication No. CN102701257A also discloses a method for preparing coarse granular strontium chloride crystals, which uses adding seed crystals and a small amount of acetic acid, stirring and slowly cooling down to crystallize to produce granular strontium chloride hexahydrate crystals, but there are also processes Time-consuming and low-efficiency problems
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  • A kind of preparation method of gritty strontium chloride hexahydrate

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Experimental program
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Effect test

Embodiment 1

[0024] Add strontium chloride mother liquor with a mass fraction of 38.60% and cetyltrimethylammonium chloride into the crystallizer, the mass fraction of cetyltrimethylammonium chloride is 0.49%, start stirring, and preheat to 40 ~43°C and stable for 0.5h. Adjust the stirring speed to 500rpm, and control the cooling rate to be constant at 15°C h -1 , start the cooling crystallization process, and stabilize for 0.5h after the temperature drops to 20°C. After the crystallization, filter with suction, wash the filter cake three times with ethanol, and dry it in an oven at 30°C for 12 hours. The obtained strontium chloride hexahydrate crystals had an average length of 792.71 μm, an average diameter of 233.25 μm, and an aspect ratio of 3.40.

Embodiment 2

[0026] Add strontium chloride mother liquor with a mass fraction of 40.90% and cetyltrimethylammonium bromide into the crystallizer, the mass fraction of cetyltrimethylammonium bromide is 0.52%, start stirring, and preheat to 48 ~50°C and stable for 0.5h. Adjust the stirring speed to 500rpm, and control the cooling rate to be constant at 15°C h -1 , start the cooling crystallization process, and stabilize for 0.5h after the temperature drops to 20°C. After the crystallization, filter with suction, wash the filter cake three times with ethanol, and dry it in an oven at 30°C for 12 hours. The obtained strontium chloride hexahydrate crystals had an average length of 881.87 μm, an average diameter of 266.08 μm, and an aspect ratio of 3.31.

Embodiment 3

[0028] Add strontium chloride mother liquor with a mass fraction of 38.60% and cetyltrimethylammonium chloride into the crystallizer, the mass fraction of cetyltrimethylammonium chloride is 0.49%, start stirring, and preheat to 40 ~43°C and stable for 0.5h. Adjust the stirring speed to 700rpm, and control the cooling rate to be constant at 25°C h -1 , start the cooling crystallization process, and stabilize for 0.5h after the temperature drops to 20°C. After the crystallization, filter with suction, wash the filter cake three times with ethanol, and dry it in an oven at 30°C for 12 hours. Gained strontium chloride hexahydrate crystals have an average length of

[0029] 843.48 μm, the average diameter is 226.93 μm, and the aspect ratio is 3.72.

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Abstract

The invention relates to a preparation method of a coarse sand-shaped strontium chloride hexahydrate. The preparation method comprises the following steps: adding a strontium chloride mother solution and a morphological control agent in a crystallizer according to a certain proportion, preheating and stirring to ensure that the strontium chloride mother solution and the morphological control agent are fully mixed; performing cooling crystallization at a constant cooling rate and a stirring rotating speed; performing suction-filtration; washing; and drying to prepare the strontium chloride hexahydrate product. According to the preparation method disclosed by the invention, due to the existence of a small amount of morphological control agent, the growth orientation of crystals in a crystallization process is remarkably changed, and thus the crystals of strontium chloride hexahydrate are changed into coarse sand shapes from needle shapes. After being dried, the strontium chloride hexahydrate product which is large in particle size, good in morphology and uniform in distribution can be obtained; and the strontium chloride hexahydrate product can be easily filtered, resists agglomeration and has good liquidity.

Description

【Technical field】 [0001] The invention relates to the technical field of strontium chloride, in particular to a method for preparing coarse sandy strontium chloride hexahydrate. 【Background technique】 [0002] Strontium chloride is an important inorganic fine chemical product, used in TFT-LCD liquid crystal, PDP plasma color TV; in medicine, it is mainly used as a desensitizer for teeth, and it can also consolidate teeth, prevent dental plaque precipitation, increase blood Circulation, reduce the incidence of periodontal disease; can also be used as raw materials for electrolytic preparation of strontium metal and its alloys, flux for the production of metallic sodium, and raw materials for the production of sponge titanium. Strontium chloride products on the market include anhydrous strontium chloride and strontium chloride hexahydrate. The function of strontium chloride hexahydrate is the same as that of anhydrous strontium chloride. Dry it at 250℃ and keep it warm for 2-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/24
Inventor 路贵民钱媛媛孙玉柱宋兴福于建国
Owner EAST CHINA UNIV OF SCI & TECH
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