Methods for preparing anhydrous lithium iodide and scintillation crystal doped with lithium iodide

A scintillation crystal, lithium iodide technology, applied in chemical instruments and methods, lithium halide, crystal growth and other directions, can solve the problems of high cost, difficult to control conditions, environmental pollution, etc., and achieve high temperature oxidation resistance, no environmental pollution, purity high effect

Active Publication Date: 2009-10-28
上海新漫传感科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the high cost of the existing preparation method of anhydrous lithium iodide, difficult to control the conditi

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  • Methods for preparing anhydrous lithium iodide and scintillation crystal doped with lithium iodide

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Experimental program
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Effect test

Embodiment 1

[0027] The preparation of embodiment 1 anhydrous lithium iodide

[0028] The operation step of preparing anhydrous lithium iodide comprises as follows (referring to appendix figure 1 ):

[0029] (1) get purity and be that lithium carbonate 100g of 99.999% is placed in the beaker of 2000ml, add about 500ml concentration again and be the analytical pure hydroiodic acid solution of 45.5%, stir and make it react fully, adjust to 6.0 to the solution pH value, then Add a small amount of ammonia water to adjust the pH value of the solution to 7.0, filter to remove impurities, then concentrate and recrystallize the filtrate, and then dissolve the obtained crystals in water to obtain a lithium iodide aqueous solution;

[0030] (2) Put the lithium iodide aqueous solution in a titanium bucket, pass argon gas into the lithium iodide aqueous solution, and heat it to 300°C at a heating rate of 5°C / min under stirring, and keep the temperature until the solution becomes Powder; the lithium ...

Embodiment 2

[0032] The preparation of embodiment 2 anhydrous lithium iodide

[0033] The operation step of preparing anhydrous lithium iodide comprises as follows:

[0034] (1) get purity and be that lithium carbonate 100g of 99.999% is placed in the beaker of 2000ml, then add about 500ml concentration and be the analytical pure hydroiodic acid solution of 45.5%, stir and make it react fully, adjust to 7.0 to the solution pH value, then Add a small amount of ammonia water to adjust the pH value of the solution to 9.0, filter to remove impurities, then concentrate the filtrate for recrystallization, and then dissolve the obtained crystals in water to obtain a lithium iodide aqueous solution;

[0035] (2) Put the lithium iodide aqueous solution in a titanium bucket, pass argon gas into the lithium iodide aqueous solution, and heat it to 260°C at a heating rate of 10°C / min under stirring, and keep the temperature until the solution becomes Powder; the lithium iodide powder is lithium iodide...

Embodiment 3

[0037] The preparation of embodiment 3 anhydrous lithium iodide

[0038] The operation step of preparing anhydrous lithium iodide comprises as follows:

[0039] (1) get purity and be that lithium carbonate 100g of 99.999% is placed in the beaker of 2000ml, then add about 500ml concentration and be the analytical pure hydroiodic acid solution of 45.5%, stir and make it react fully, adjust to 6.5 to the solution pH value, then Add a small amount of ammonia water to adjust the pH value of the solution to 8.0, filter to remove impurities, then concentrate the filtrate for recrystallization, and then dissolve the obtained crystals in water to obtain a lithium iodide aqueous solution;

[0040] (2) Put the lithium iodide aqueous solution in a titanium bucket, pass argon gas into the lithium iodide aqueous solution, and heat it to 280°C at a heating rate of 8°C / min under stirring, and keep the temperature until the solution becomes Powder; the lithium iodide powder is lithium iodide ...

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Abstract

The invention discloses a method for preparing an anhydrous lithium iodide, comprising the following operation steps of: dehydrating the lithium iodide water solution to the lithium iodide powders containing 0.5-1 crystal water; and subsequently carrying out heating and dehydration treatment in vacuum to obtain the anhydrous lithium iodide. The invention also discloses a method for preparing a scintillation crystal doped with the lithium iodide, comprising the following operation steps of: dehydrating the lithium iodide water solution to the lithium iodide powders containing 0.5-1 crystal water; mixing the lithium iodide powder with the doped compound; subsequently carrying out heating and dehydration treatment in vacuum; and subsequently carrying out crystal growth under a vacuum state by adopting a Bridgman method, thus obtaining the scintillation crystal doped with the lithium iodide. The method for preparing the anhydrous lithium iodide has simple operation and no environmental pollution and is easy for large-scale industrial production; the method for preparing the scintillation crystal doped with the lithium iodide has simple process, is not easy to be oxidized at high temperature during the preparation process and can produce the high-quality scintillation crystal doped with the lithium iodide in batches.

Description

technical field [0001] The invention relates to a preparation method of anhydrous lithium iodide and a preparation method of doped lithium iodide scintillation crystal. Background technique [0002] In recent years, with the increasing application of neutron detection in the fields of nuclear energy utilization, radioisotope generation and nuclear physics research, research on neutron detection materials has attracted more and more attention from material and physicists around the world. Neutrons themselves are not charged and cannot be ionized or excited, so they cannot be directly detected by ordinary detectors. It can be measured by using the secondary particles produced by the interaction of neutrons and some nuclei (including nuclear reaction, nuclear fission or nuclear recoil) incorporated into the detector. The detector converts the energy of neutrons into electrical pulses, and these signals are then After processing, it can be turned into data, charts or images tha...

Claims

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Application Information

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IPC IPC(8): C01D15/04C30B11/00C30B29/12
Inventor 吴凤雷叶崇志张洁丁祖兵
Owner 上海新漫传感科技有限公司
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