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A kind of preparation method of anhydrous lanthanum bromide

A water lanthanum bromide and ammonium bromide technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problems of restricting the development of lanthanum bromide scintillation crystals, demanding content control, and difficult process control. , to achieve the effect of easy control of the preparation process, low production cost and low cost

Active Publication Date: 2016-11-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the strong hydrolysis of anhydrous lanthanum bromide at high temperature, its preparation process has extremely strict requirements on the control of oxygen and water vapor content in the surrounding environment, resulting in the current production process of high-purity anhydrous lanthanum bromide is complicated, the process control is difficult, and the product cost is very high. High, restricting the development of lanthanum bromide scintillation crystals

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  • A kind of preparation method of anhydrous lanthanum bromide
  • A kind of preparation method of anhydrous lanthanum bromide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 6.52g of lanthanum oxide and 23.5g of ammonium bromide were mixed evenly and added to the corundum crucible. The mixture was first incubated at 400°C for 2.0 hours and then at 550°C for 1.0 hour. Thus, anhydrous lanthanum bromide is obtained. In this embodiment, the mass ratio of ammonium bromide to lanthanum oxide is 3.60:1, the mixture of lanthanum oxide and ammonium bromide is the covering, and the thickness of the covering is 7 mm.

[0063] The anhydrous lanthanum bromide obtained is characterized according to the above-mentioned measurement method, and the results are as follows:

[0064] Carry out XRD phase analysis on the sample composition, the composition is anhydrous LaBr 3 , see attached figure 1 .

[0065] The precipitate after the sample was dissolved in water was titrated, and the purity of anhydrous lanthanum bromide was measured to be 99.58%.

[0066] The moisture content in the sample was measured, and the moisture content in the sample was measur...

Embodiment 2

[0068] 3.26g of lanthanum oxide and 11.75g ​​of ammonium bromide were mixed evenly and added to the corundum crucible. Then, a 10 mm thick layer of aluminum oxide was overlaid on the mixture of lanthanum oxide and ammonium bromide. The mixture was first incubated at 350°C for 2.0 hours and then at 550°C for 1.0 hour. In this way, the upper layer of alumina and the lower layer of anhydrous lanthanum bromide are obtained with obvious layering. In this embodiment, the mass ratio of ammonium bromide to lanthanum oxide is 3.60:1, aluminum oxide is the covering, and the thickness of the covering is 10 mm.

[0069] The anhydrous lanthanum bromide obtained is characterized according to the above-mentioned measurement method, and the results are as follows:

[0070] Carry out XRD phase analysis on the sample composition, the composition is anhydrous LaBr 3 .

[0071] The precipitate after the sample was dissolved in water was titrated, and the purity of anhydrous lanthanum bromide ...

Embodiment 3

[0074] 13.04g of lanthanum oxide and 47.00g of ammonium bromide were mixed evenly and added to the corundum crucible. Then, a 13 mm thick layer of aluminum oxide was overlaid on the mixture of lanthanum oxide and ammonium bromide. The mixture was first incubated at 400°C for 2.5 hours and then at 600°C for 1.0 hour. In this way, the upper layer of alumina and the lower layer of anhydrous lanthanum bromide are obtained with obvious layering. In this embodiment, the mass ratio of ammonium bromide to lanthanum oxide is 3.60:1, aluminum oxide is the covering, and the thickness of the covering is 13 mm.

[0075] The anhydrous lanthanum bromide obtained is characterized according to the above-mentioned measurement method, and the results are as follows:

[0076] Carry out XRD phase analysis on the sample composition, the composition is anhydrous LaBr 3 .

[0077] The precipitate after the sample was dissolved in water was titrated, and the purity of anhydrous lanthanum bromide w...

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Abstract

The invention discloses a method for preparing anhydrous lanthanum bromide. The method comprises: (1) uniformly mixing ammonium bromide and lanthanum oxide; (2) placing the mixture obtained in step (1) in an airtight Heating under ambient conditions gives anhydrous lanthanum bromide. The method of the present invention has easy-to-obtain raw materials and low cost; the preparation process is simple, the process is short, the preparation process is easy to control, the product yield is high, and the production cost is low; the prepared anhydrous lanthanum bromide has high purity, and the purity can reach 99.5 %, can be used in the preparation of lanthanum bromide scintillation crystals, and has good industrial and commercial prospects.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic materials, in particular to a preparation method of anhydrous lanthanum bromide. Background technique [0002] to Ce 3+ Ion-activated lanthanum bromide crystals (LaBr 3 : Ce 3+ ) is a new type of inorganic scintillation crystal developed in recent years. Compared with similar crystals, this crystal has the advantages of higher light yield, better energy resolution, faster decay time, and less nonlinear response; compared with traditional NaI(TI) crystals, Ce 3+ Ion-activated lanthanum bromide crystals have many excellent properties and have feasible prospects for industrialization and commercialization. be widely used. [0003] The preparation of anhydrous lanthanum bromide is one of the key links in the preparation of the above-mentioned lanthanum bromide crystal. The method for preparing anhydrous lanthanum bromide at present has following several kinds: [0004] (1) Chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00
Inventor 卢旭晨张志敏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI