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A kind of preparation method of zinc tungstate crystal with nanometer size

A technology of nanometer size and zinc tungstate, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of large product particle size, high energy consumption of synthetic powder, complicated preparation process, etc., and achieve low cost, Reduce the synthesis temperature and facilitate the preparation

Inactive Publication Date: 2015-11-18
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the powder prepared by the above method has some disadvantages, such as large particle size of the product, complicated preparation process, long reaction cycle and high energy consumption of high-temperature synthetic powder, etc.

Method used

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  • A kind of preparation method of zinc tungstate crystal with nanometer size
  • A kind of preparation method of zinc tungstate crystal with nanometer size
  • A kind of preparation method of zinc tungstate crystal with nanometer size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1. Put the main raw material and the molten salt raw material in a ball mill at a mass ratio of 1:12, use absolute ethanol as the ball milling medium, use zirconium balls as the milling balls, and mix them for 4 hours, then dry them at 50°C to obtain a mixed Powder; the main raw material is sodium tungstate and zinc oxalate, the molar ratio of sodium tungstate and zinc oxalate is 1.5:1; the molten salt raw material is a mixture of lithium nitrate and potassium chloride, lithium nitrate and potassium chloride The mol ratio is 3:2; The quality of described dehydrated alcohol is equal to the mass summation of main raw material and molten salt raw material;

[0025] Step 2: Heat the mixed powder described in step 1 in an oil bath to 300°C under stirring conditions, and then heat and stir for 4 hours to obtain zinc tungstate powder;

[0026] Step 3. Repeatedly washing the zinc tungstate powder described in step 2 with deionized water until the washing solution does not ...

Embodiment 2

[0028] Step 1. Put the main raw material and the molten salt raw material in a ball mill at a mass ratio of 1:14, use absolute ethanol as the ball milling medium, and use zirconium balls as the milling balls, mix for 4 hours, and then dry at 55°C to obtain a mixed Powder; the main raw material is sodium tungstate and zinc oxalate, the molar ratio of sodium tungstate and zinc oxalate is 1.5:1; the molten salt raw material is a mixture of lithium nitrate and potassium chloride, lithium nitrate and potassium chloride The mol ratio is 3:2; The quality of described dehydrated alcohol is equal to the mass summation of main raw material and molten salt raw material;

[0029] Step 2: Heat the mixed powder described in step 1 in an oil bath to 350°C under stirring conditions, and then heat and stir for 3 hours to obtain zinc tungstate powder;

[0030] Step 3. Repeatedly washing the zinc tungstate powder described in step 2 with deionized water until the washing liquid does not contain ...

Embodiment 3

[0032] Step 1. Put the main raw material and the molten salt raw material in a ball mill at a mass ratio of 1:15, use absolute ethanol as the ball milling medium, and use zirconium balls as the milling balls, mix for 4 hours, and then dry at 60°C to obtain a mixed Powder; the main raw material is sodium tungstate and zinc oxalate, the molar ratio of sodium tungstate and zinc oxalate is 2:1; the molten salt raw material is a mixture of lithium nitrate and potassium chloride, lithium nitrate and potassium chloride The mol ratio is 3:3; The quality of described dehydrated alcohol is equal to the mass summation of main raw material and molten salt raw material;

[0033] Step 2: Heat the mixed powder mentioned in step 1 in an oil bath to 400°C under stirring conditions, and then heat and stir for 2 hours to obtain zinc tungstate powder;

[0034] Step 3. Repeatedly washing the zinc tungstate powder described in step 2 with deionized water until the washing liquid does not contain ch...

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Abstract

The invention discloses a preparation method for ZnWO4 crystals with nanometer size. The method comprises the following steps: 1, placing main raw materials and molten salt raw materials into a ball mill to be subjected to ball-milling and uniformly mixed, and then drying, so as to obtain mixed powder materials; 2, heating the mixed powder materials through oil bath under the stirring condition, and then keeping the temperature and stirring, so as to obtain ZnWO4 powder; 3, repeatedly washing the ZnWO4 powder with deionized water until the washing liquid contains no chloride ions, and drying, so as to obtain the ZnWO4 crystals with the nanometer size. The preparation method has the characteristics that the raw materials are easy to obtain, the cost is low, the technology is simple, the preparation is convenient, the environmental suitability is excellent, and the industrialized production can be easily implemented; the grain size of the ZnWO4 crystals prepared through the adoption of the method is 20 nm-200nm, the powder dispersity is good, and the development of crystals is good.

Description

technical field [0001] The invention belongs to the technical field of preparation of micro-nano crystal powder, and in particular relates to a preparation method of zinc tungstate crystals with nanometer size. Background technique [0002] Zinc tungstate (ZnWO 4 ) is an important functional material, because of its excellent chemical stability, high refractive index, high X-ray absorption coefficient, high quantum yield, and good photoelectric activity, it is widely used in ray scintillators, photoluminescence, and microwave systems. Solid-state lasers, gas and humidity sensors, photocatalysis, acousto-optic fibers, and magnetic materials have a wide range of applications. In order for zinc tungstate to exert the greatest effect in the above applications, it is generally required to have a nanometer size and complete crystal development. Therefore, exploring the preparation process of nanometer-sized zinc tungstate crystals has become a research hotspot. There are many me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00B82Y30/00B82Y40/00
Inventor 刘向春左琛光李继苗周凯旋杨洋
Owner XIAN UNIV OF SCI & TECH
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