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High-efficiency method for preparing cadmium tungstate powder

A technology of cadmium tungstate and powder, which is applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve problems such as unfavorable suction filtration impurity removal process, expansion, etc., to improve suction filtration efficiency, reduce volume, and reduce reaction temperature low effect

Inactive Publication Date: 2017-10-10
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] For using pure water as a solvent in the traditional solvent solution method, the sol volume of the reaction gained ("sol volume" in the present invention refers to the volume of the two solutions that are deposited on the bottom of the beaker after standing for more than 10h after the reaction) Part of the sol volume) is enlarged, which is unfavorable for the shortcoming of the subsequent suction filtration and impurity removal process. The purpose of this invention is to provide a kind of method for efficiently preparing cadmium tungstate powder, to improve the traditional method of preparing cadmium tungstate powder by solution method

Method used

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  • High-efficiency method for preparing cadmium tungstate powder
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  • High-efficiency method for preparing cadmium tungstate powder

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preparation example Construction

[0026] About the preparation of the precursor solution. Precursor solution of the present invention, including Na 2 WO 4 Aqueous solution and soluble cadmium salt alcohol solution. Na 2 WO 4 The aqueous solution can be made of Na 2 WO 4 2H 2 O is dissolved in pure water and prepared. Na 2 WO 4 The concentration of the aqueous solution may be 0.5-1.0 mol / L. Na 2 WO 4 If the concentration of the aqueous solution is too high, the solute is difficult to dissolve completely; Na 2 WO 4 If the concentration of the aqueous solution is too low, the preparation efficiency will be affected.

[0027] In the present invention, soluble cadmium salt is used as cadmium source, and the soluble cadmium salt alcohol solution can be obtained by dissolving soluble cadmium salt in water-soluble alcohol. Preferably, the soluble cadmium salt can be cadmium nitrate or cadmium chloride. More preferably, cadmium nitrate can be used as the soluble cadmium salt.

[0028] Preferably, the w...

Embodiment 1

[0045] 1.1 Add a certain amount of Na 2 WO 4 2H 2 O is dissolved in pure water and configured as Na with a concentration of 0.5mol / L 2 WO 4 aqueous solution;

[0046] 1.2 A certain amount of Cd(NO 3 ) 2 Dissolved in sufficient glycerol, configured as Cd(NO 3 ) 2 glycerol solution;

[0047] 1.3 Take 10mL of Na 2 WO 4 aqueous solution and 5 mL of Cd(NO 3 ) 2 Glycerol solution, mixed with each other evenly, using a magnetic constant temperature stirrer, after stirring for 1 hour at a temperature of 70 ° C, the volume of this sol is only about 1 / 2 of the cadmium tungstate sol of Comparative Example 1;

[0048] 1.4. Use the suction filtration equipment composed of Buchner funnel and circulating water vacuum pump to perform suction filtration and impurity removal operation on the sol with reduced volume. After fully drying at a temperature of 40°C, a granular solid sample was obtained;

[0049] 1.5. Put the obtained granular solid sample in a muffle furnace and calcina...

Embodiment 2

[0051] 2.1 Add a certain amount of Na 2 WO 4 2H 2 O is dissolved in pure water and configured as Na with a concentration of 0.5mol / L 2 WO 4 aqueous solution;

[0052] 2.2 A certain amount of Cd(NO 3 ) 2 Dissolved in sufficient glycerol, configured as Cd(NO 3 ) 2 glycerol solution;

[0053] 2.3 Take 10mL of Na 2 WO 4 aqueous solution and 10 mL of Cd(NO 3 ) 2 Glycerin solution, mixed with each other evenly, using a magnetic constant temperature stirrer, after stirring at a temperature of 70 ° C for 1 hour, the volume of this sol is only about 1 / 3 of the traditional method. Cadmium tungstate sol;

[0054] 2.4. Carry out suction filtration and impurity removal operation on the reduced-volume sol, and perform suction filtration for about 20 minutes each time. Place it in a constant temperature oven and fully dry it at a temperature of 40°C to obtain a granular solid. sample;

[0055] 2.5. Put the obtained granular solid sample in a muffle furnace and calcinate it at a...

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Abstract

The invention relates to a high-efficiency method for preparing cadmium tungstate powder. The method comprises the following steps: a precursor solution containing Na2WO4.2H2O and a soluble cadmium salt and using a mixture of water and a water-soluble alcohol as a reaction solvent is stirred at a temperature of 60-80 DEG C, so that a cadmium tungstate sol is obtained, wherein the volume ratio of the water-soluble alcohol to the water is (1-10):2; and the cadmium tungstate sol is subjected to vacuum filtration and drying to obtain a granular solid, and the granular solid is calcinated at a temperature of 800-1000 DEG C, so that the cadmium tungstate powder is obtained. The method uses the mixture of the water-soluble alcohol and the pure water as the reaction solvent relative to a conventional solution method of choosing water as a reaction solvent, so that the volume of the cadmium tungstate sol can be greatly reduced, vacuum filtration time is shortened, and vacuum filtration efficiency is effectively improved, and therefore the efficiency of preparing the cadmium tungstate powder is improved.

Description

technical field [0001] The invention belongs to the technical field of powder preparation, and specifically relates to a method for preparing cadmium tungstate powder by using a mixture of water-soluble alcohol and water as a solvent in the process of preparing cadmium tungstate powder by a solution method to improve the efficiency of suction filtration. Background technique [0002] Cadmium tungstate (CdWO 4 , referred to as CWO) as a scintillation crystal material, has the characteristics of no deliquescence in the air, high density (7.9g / cm 3 ), high effective atomic number, high light output value, short afterglow (Afterglow) and high energy resolution and many other advantages, it has a very broad application prospect in the fields of industrial CT, medical CT and petroleum logging. [0003] The preparation of cadmium tungstate powder not only has its unique application value, but also can provide raw materials for the later growth of cadmium tungstate single crystals,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
CPCC01G41/00C01P2002/72C01P2002/82
Inventor 陈锐袁晖周尧熊巍陈良
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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