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Preparation method of high-purity strontium hydroxide

A strontium hydroxide, high-purity technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, can solve the problem of low purity of strontium hydroxide products, and achieve the effects of reducing carbonization, improving calcination efficiency and improving purity

Inactive Publication Date: 2019-01-04
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that the purity of the strontium hydroxide product existing in the above-mentioned prior art is not high, the present invention provides a kind of preparation method of high-purity strontium hydroxide

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  • Preparation method of high-purity strontium hydroxide

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[0030] The preparation method of high-purity strontium hydroxide of the present invention comprises the following steps:

[0031] In step S1, industrial strontium carbonate is calcined by a microwave calcining method to obtain a calcined product.

[0032] Preferably, in this step, the calcination temperature is 1250°C-1350°C, and the calcination time is 10min-30min. Microwave heating can achieve the effect of rapid calcination, and the time required is a fraction or even a tenth of the heating time of muffle furnaces, electric furnaces, tunnel kilns, lifting kilns, rotary kilns and other equipment.

[0033] In step S2, the calcined product is soaked in water and subjected to hot filtration to obtain a first hot solution of strontium hydroxide.

[0034] Preferably, in this step, the calcined product is soaked in water according to a solid-to-liquid ratio of 1:5 to 1:10; that is, for every 1 mass part of the calcined product, 5 to 10 mass parts of water are used for water immer...

Embodiment 1

[0049] The first step is calcining strontium carbonate.

[0050] Specifically, 200 g of industrial strontium carbonate was weighed, placed in a microwave calciner, heated to 1250° C. for 15 min, and kept at a temperature of 30 min to obtain 140.5 g of a calcined product.

[0051] In the second step, crude strontium hydroxide is prepared.

[0052]Specifically, the calcined product is immersed in 702.5g of water, heated to boiling and kept for 10 minutes to obtain the first slurry; the first slurry is filtered while it is hot to obtain the first hot solution of strontium hydroxide, and the solution is cooled to 5°C, solid-liquid separation to obtain aqueous crude strontium hydroxide octahydrate crystals; place the crystals in a blast drying oven, and dry at 50°C for 30 minutes to obtain 325 g of crude strontium hydroxide.

[0053] In the obtained crude strontium hydroxide, the content of strontium hydroxide octahydrate is 98.93%.

[0054] The third step is to prepare high-puri...

Embodiment 2

[0058] The first step is calcining strontium carbonate.

[0059] Specifically, 200 g of industrial strontium carbonate was weighed, placed in a microwave calciner, heated to 1280° C. for 15 minutes, and kept for 25 minutes to obtain 141.5 g of calcined products.

[0060] In the second step, crude strontium hydroxide is prepared.

[0061] Specifically, the calcined product is immersed in 849g of water, heated to boiling and kept for 15 minutes to obtain the first slurry; the first slurry is filtered while it is hot to obtain the first hot solution of strontium hydroxide, and the solution is cooled to 10 °C; solid-liquid separation to obtain aqueous crude strontium hydroxide octahydrate crystals; place the crystals in a blast drying oven and dry at 50 °C for 30 minutes to obtain 306 g of crude strontium hydroxide.

[0062] In the obtained crude strontium hydroxide, the content of strontium hydroxide octahydrate is 99.01%.

[0063] The third step is to prepare high-purity stron...

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Abstract

The invention discloses a preparation method of high-purity strontium hydroxide. The method comprises the following steps: S1, calcining industrial strontium carbonate through a microwave calcinationmethod, so as to obtain a calcined product; S2, performing water leaching on the calcined product, and performing hot filtration, so as to obtain a first strontium hydroxide hot solution; S3, coolingthe first strontium hydroxide hot solution till the first strontium hydroxide hot solution is crystallized, performing solid-liquid separation, and drying obtained solid phase, so as to obtain a strontium hydroxide crude product; S4, recrystallizing the strontium hydroxide crude product in protective atmosphere, so as to obtain the high-purity strontium hydroxide, and ensuring that the content ofthe strontium hydroxide octahydrate in the high-purity strontium hydroxide is not smaller than 99.5 percent. The method performs recrystallization through the microwave calcination method and the protective atmosphere, on the one hand, realizes rapid calcinations of industrial strontium carbonate, greatly improves the calcination efficiency, and on the other hand, maximumlly reduces carbonizationof subsequently produced strontium hydroxide, finally reduces the content of strontium carbonate impurity of a strontium hydroxide product, ensures that the content of strontium carbonate is smaller than 0.3 percent, and effectively improves the purity of the strontium hydroxide product.

Description

technical field [0001] The invention belongs to the technical field of strontium hydroxide preparation, and specifically relates to a preparation method of high-purity strontium hydroxide. Background technique [0002] Strontium hydroxide is an important strontium compound product, which was first widely used in the refining process of beet sugar. In addition, it is also used as a stabilizer for polyethylene plastics, for strontium lubricating wax, and for improving drying oil and Dryness of paint, etc.; strontium hydroxide is also an intermediate compound or raw material for the preparation of other strontium products. [0003] The preparation method of strontium hydroxide includes two categories of using celestite as raw material and strontium carbonate as raw material, among which strontium carbonate can be used as the raw material to use strontium carbonate acidification method. [0004] Strontium carbonate acidification method is to dissolve industrial strontium carbon...

Claims

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Application Information

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IPC IPC(8): C01F11/16C01F11/06
CPCC01F11/06C01F11/16C01P2002/72C01P2006/80
Inventor 邹兴武曹晓会段东平王树轩李波史永明祁米香杨占寿
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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