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A kind of preparation method of twin spherical calcium tungstate crystallite

A calcium tungstate, spherical technology, applied in the field of micro-nano material preparation, can solve the problems of harsh high-temperature reaction conditions, complex preparation process, difficult size control, etc., and achieve the effects of environmental protection and easy availability of raw materials, good dispersibility, and uniform size.

Inactive Publication Date: 2015-08-19
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many preparation methods for calcium tungstate micro-nano materials, such as solid-state reaction method, hydrothermal method, ultrasonic irradiation method, microwave radiation method, precipitation method, gel method, etc., but these methods still have shortcomings to a certain extent. For example, the shape of the product is single or the size is difficult to control; the yield is not high; the high temperature reaction conditions are harsh or the preparation process is relatively complicated; the cost is relatively high; the environmental pollution is large, etc.
Therefore, it is still a challenge to explore simple and environmentally friendly methods to prepare calcium tungstate micro-nano materials with novel morphology, high yield and good dispersion.

Method used

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  • A kind of preparation method of twin spherical calcium tungstate crystallite
  • A kind of preparation method of twin spherical calcium tungstate crystallite
  • A kind of preparation method of twin spherical calcium tungstate crystallite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The SEM image of the calcium tungstate twin spheres prepared in this example is as follows figure 1 shown ， The preparation method comprises the following steps:

[0026] 1) Weigh 0.076g cyclodextrin and dissolve it in 10ml deionized water, stir well, add 0.3299g sodium tungstate to make solution A; weigh 0.2361g calcium nitrate and dissolve it in 10ml deionized water to make solution B;

[0027] 2) Under stirring, add 10ml of solution B into 10ml of solution A, and stir for 1 hour at room temperature to prepare calcium tungstate twin balls;

[0028] 3) After the reaction, the reaction solution was centrifuged, and then the precipitate was washed several times with deionized water and absolute ethanol;

[0029] 4) Dry the precipitate in a vacuum drying oven at 50°C to finally obtain white calcium tungstate powder.

Embodiment 2

[0031] The SEM image of the calcium tungstate twin spheres prepared in this example is as follows figure 2 shown ， The preparation method comprises the following steps:

[0032] 1) Weigh 0.076g cyclodextrin and dissolve it in 10ml deionized water, stir well, add 0.3299g sodium tungstate to make solution A; weigh 0.2361g calcium nitrate and dissolve it in 10ml deionized water to make solution B;

[0033] 2) Under stirring, add 10ml of solution B into 10ml of solution A, stir and react for 3 hours at room temperature to obtain calcium tungstate twin balls;

[0034] 3) After the reaction, the reaction solution was centrifuged, and then the precipitate was washed several times with deionized water and absolute ethanol;

[0035] 4) Dry the precipitate in a vacuum drying oven at 50°C to finally obtain white calcium tungstate powder.

Embodiment 3

[0037] The SEM image of the calcium tungstate twin spheres prepared in this example is as follows image 3 shown ， The preparation method comprises the following steps:

[0038] 1) Weigh 0.076g cyclodextrin and dissolve it in 10ml deionized water, stir well, add 0.3299g sodium tungstate to make solution A; weigh 0.2361g calcium nitrate and dissolve it in 10ml deionized water to make solution B;

[0039] 2) Under stirring, add 10ml of solution B into 10ml of solution A, stir and react for 6 hours at room temperature, and obtain calcium tungstate twin balls;

[0040] 3) After the reaction, the reaction solution was centrifuged, and then the precipitate was washed several times with deionized water and absolute ethanol;

[0041] 4) Dry the precipitate in a vacuum drying oven at 50°C to finally obtain white calcium tungstate powder.

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Abstract

The invention provides a preparation method of twinborn spheroidal calcium tungstate microcrystallines, which is characterized in that raw materials comprise 0.05-0.2 mol / L sodium tungstate, 0.05-0.2 mol / L calcium nitrate and 3.8-7.6 g / L beta cyclodextrins. The method disclosed by the invention has the characteristics of environmental protection, energy conservation, high efficiency and rapidness, and the like, and prepared twinborn spheroidal calcium tungstate is regular in appearance, good in dispersibility, high in yield and good in stability, and formed spheres are 4 mu m in size, and uniform in size; and required raw materials are environment-friendly and easily obtained, and the preparation process is simple and easy to implement, therefore, the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of micro-nano materials, and mainly relates to a preparation method of calcium tungstate micron twin spheres. technical background [0002] Calcium tungstate (CaWO 4 ) is a typical self-activated luminescent material with stable physical and chemical properties. Due to its superior luminous performance, it can be used as a blue phosphor in an oscilloscope, and a scintillator for detecting X-rays and gamma rays in medicine. At the same time, calcium tungstate can be used as a laser matrix material. If rare earth ions such as Eu 3+ , Pr 3+ etc. are mixed into calcium tungstate materials as activators, which can make it produce red long afterglow luminescence, thus gaining important applications. Due to its special advantages in size, micro-nano calcium tungstate will play a vital role in future light-emitting devices. [0003] At present, there are many preparation methods for calcium tungs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00
Inventor 张进彭丽丽唐英李庆
Owner CHONGQING UNIV OF ARTS & SCI
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