Preparation method of sillenite bismuth silicate microcrystal

A technology of bismuth silicate and microcrystals, applied in chemical instruments and methods, bismuth compounds, inorganic chemistry, etc., can solve the problems of unreported research and achieve the effect of simple preparation process, abundant sources, and small size

Inactive Publication Date: 2010-08-04
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the literature reports focus on the preparation and application of bismuth silicate crystals, and the

Method used

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  • Preparation method of sillenite bismuth silicate microcrystal
  • Preparation method of sillenite bismuth silicate microcrystal

Examples

Experimental program
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Embodiment 1

[0021] Embodiment 1, 1) at first, bismuth trioxide and quartz sand are pressed Bi 2 o 3 : SiO 2 The mol ratio of =6: 1 is put into the agate emulsion ball milling jar to obtain the mixture, then in the agate emulsion ball milling jar, add the ethanol ball milling of 40% of the mixture quality after 1 hour and the slurry obtained is incubated at 150° C. for 2 Obtain batch material in hours, said quartz sand is through the quartz sand after pickling, and particle size is 300 meshes, and bismuth trioxide adopts particle size to be the analytically pure bismuth trioxide of 200 meshes;

[0022] 2) Then, add 30% of the weight ratio of the batching material into the high-purity alumina crucible with a cover in the muffle furnace in advance, the first feeding temperature is 900 ° C, and add the remaining batching material after 10 minutes of heat preservation, so as to 20°C / min to raise the temperature to 1050°C, cover the crucible and keep it warm for 1 hour, during the heat preser...

Embodiment 2

[0025] Embodiment 2, 1) at first, bismuth trioxide and quartz sand are pressed Bi 2 o 3 : SiO 2 The mol ratio of =6: 1 is put into the agate emulsion ball milling tank to obtain the mixture, then in the agate emulsion ball milling jar, add the ethanol ball milling of 40% of the mixture quality after 3 hours to obtain the slurry at 150 ℃ for 2 hours Obtain batch material in hours, said quartz sand is through the quartz sand after pickling, and particle size is 300 meshes, and bismuth trioxide adopts particle size to be the analytically pure bismuth trioxide of 200 meshes;

[0026] 2) Then, add 30% of the weight ratio of the batch material into the high-purity alumina crucible with a cover in the muffle furnace in advance, the first feeding temperature is 950 ° C, and add the remaining batch material after 15 minutes of heat preservation, so as to Heat up to 1050°C at 24°C / min, cover the crucible and keep it warm for 2 hours, and stir the molten glass liquid or batch for 1min ...

Embodiment 3

[0029] Embodiment 3, 1) at first, bismuth trioxide and quartz sand are pressed Bi 2 o 3 : SiO 2 The mol ratio of =6: 1 is put into the agate emulsion ball milling tank to obtain the mixture, then in the agate emulsion ball milling jar, add the ethanol ball milling of 40% of the mixture quality after 5 hours to obtain the slurry at 150 ℃ for 2 hours Obtain batch material in hours, said quartz sand is through the quartz sand after pickling, and particle size is 300 meshes, and bismuth trioxide adopts particle size to be the analytically pure bismuth trioxide of 200 meshes;

[0030] 2) Then, add 30% of the weight ratio of the batch into the high-purity alumina crucible with a cover in the muffle furnace in advance. 30°C / min to raise the temperature to 1050°C, cover the crucible and keep it warm for 5 hours, during the keep warm process, stir the molten glass liquid or batch material for 1min every 1 hour;

[0031]3) After the heat preservation is over, remove the crucible cove...

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Abstract

The invention relates to a preparation method of a sillenite bismuth silicate microcrystal, which comprises the following steps: firstly, mixing and adding bismuth trioxide powder and quartz sand into a ball milling tank, adding ethanol for uniformly mixing, and then drying to obtain a mixture; then, adding the mixture into a crucible for melting; after melting, taking the crucible out of a muffle furnace, and putting the crucible outside the furnace for quickly cooling at room temperature; and when the surface of the molten glass in the crucible is supercooled and crystallized, putting the crucible into the muffle furnace again for heating, then cooling the crucible at room temperature, and repeatedly heating and cooling the crucible to obtain the bismuth silicate microcrystal. By adding raw materials at high temperature and using a process for quickly melting at high temperature, the invention avoids the influence of uneven components caused by volatilization of the bismuth trioxide at high temperature. The prepared bismuth silicate (Bi12SiO20) microcrystal has small size, high crystal purity, extremely few impurity phases, low cost of raw materials, wide sources of raw materials, lower synthesis temperature and simple preparation process, and is favorable for industrialized production.

Description

technical field [0001] The invention relates to a preparation method of bismuth silicate microcrystals, in particular to a preparation method of soft bismuth ore bismuth silicate microcrystals. Background technique [0002] Searching for new functional crystals is the frontier of international crystal materials science, and the research on new functional crystals prediction, raw material preparation, crystallization behavior, crystal growth and other aspects is the basis of new functional crystal research. In recent years it has been discovered that Bi 2 o 3 -SiO 2 The system is a system with great value for further research. Since elements Si and Ge belong to the same main group in the periodic table of chemical elements and have similar properties, Bi 2 o 3 -SiO 2 System and Bi 2 o 3 -GeO 2 The systems have many similarities in structure and performance. Currently against Bi 2 o 3 -GeO 2 Systematic research has been relatively mature, and for Bi 2 o 3 -SiO ...

Claims

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Application Information

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IPC IPC(8): C01G29/00
Inventor 郭宏伟王秀峰贺祯龚煜轩田鹏朱常任高档妮
Owner SHAANXI UNIV OF SCI & TECH
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