Devitrified alpha cordierite microcrystal glass prepared from Bayan Obo tailings and coal ash and preparation method thereof

A technology of glass-ceramics and fly ash, which is applied in the field of glass-ceramics preparation to achieve the effects of solving pollution, improving crystallization ability, and simple process

Active Publication Date: 2018-08-14
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Devitrified alpha cordierite microcrystal glass prepared from Bayan Obo tailings and coal ash and preparation method thereof
  • Devitrified alpha cordierite microcrystal glass prepared from Bayan Obo tailings and coal ash and preparation method thereof
  • Devitrified alpha cordierite microcrystal glass prepared from Bayan Obo tailings and coal ash and preparation method thereof

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Embodiment 1

[0030] A volume crystallized α-cordierite glass-ceramic prepared by using Baiyan Obo tailings and fly ash, comprising the following raw materials in parts by weight: 13.73 parts of Baiyan Obo tailings, 30.26 parts of fly ash, 25.28 parts of quartz sand, magnesium oxide 9.67 parts, 11.71 parts of alumina, 6.89 parts of borax, 1.63 parts of magnesium fluoride, 0.82 parts of ammonium dihydrogen phosphate.

[0031] The preparation method of volume crystallization α cordierite glass-ceramics comprises the following steps:

[0032] (1) Mixing: each raw material is mixed evenly with a ball mill;

[0033] (2) Melting: heat the mixed raw materials in a corundum crucible to 1550°C for melting, and keep the temperature for 2.5 hours to obtain a glass melt;

[0034] (3) Forming: casting the glass melt into a preheated (600°C) stainless steel mold;

[0035] (4) Annealing: Transfer the formed glass to a heating furnace with an inner temperature of 600°C, anneal for 2.5 hours, and cool to ...

Embodiment 2

[0043] A volume crystallized α-cordierite glass-ceramic prepared by using Baiyan Obo tailings and fly ash, comprising the following raw materials in parts by weight: 13.57 parts of Baiyan Obo tailings, 29.92 parts of fly ash, 25.00 parts of quartz sand, magnesium oxide 7.48 parts, 11.58 parts of alumina, 6.81 parts of borax, 4.84 parts of magnesium fluoride, 0.81 parts of ammonium dihydrogen phosphate.

[0044] The preparation method of volume crystallization α cordierite glass-ceramics comprises the following steps:

[0045] (1) Mixing: each raw material is mixed evenly with a ball mill;

[0046] (2) Melting: heat the mixed raw materials in a corundum crucible to 1550°C for melting, and keep the temperature for 3 hours to obtain a glass melt;

[0047] (3) Forming: casting the glass melt into a preheated (600°C) stainless steel mold;

[0048] (4) Annealing: Transfer the formed glass to a heating furnace with an inner temperature of 600°C, anneal for 3 hours, and cool to room...

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Abstract

The invention relates to devitrified alpha cordierite microcrystal glass prepared from Bayan Obo tailings and coal ash and a preparation method thereof. The devitrified alpha cordierite microcrystal glass is mainly characterized in that adding amount of Bayan Obo tailings, coal ash and other necessary raw materials is controlled, so that requirements of the cordierite chemical component are met; ammonium dihydrogen phosphate is further added, and magnesium fluoride is used to replace the original part of magnesium oxide in the raw material, so that devitrification ability of alpha cordierite is improved; a fusion preparation process is adopted to perform nucleating heat treatment for 1-5 hours within a temperature range being 700-800 DEG C, and crystallization thermal treatment for 1-5 hours within a temperature being 1000-1100 DEG C, so that an alpha cordierite microcrystal glass material with high strength and a low thermal expansion coefficient, which is basically free of gas holesand separates out alpha cordierite in the devitrification form, is produced; and a method is provided for realizing high-additional-value utilization of solid waste such as cordierite tailings and coal ash while land occupation is reduced, and the polluted environment problem is solved.

Description

technical field [0001] The invention relates to a volume crystallization alpha cordierite glass-ceramic prepared by using Baiyan Obo tailings and fly ash and a preparation method thereof, belonging to the field of glass-ceramic preparation. Background technique [0002] α-cordierite is a chemical composition close to Mg 2 al 4 Si 5 o 18 A general term for crystalline minerals, which have two structural changes, μ and α. . Based on the openness of the crystal structure of oxides, ions with similar valence states and ionic sizes are prone to mutual substitution. Under natural and synthetic conditions, the metal ions in the above two cordierite crystals can be replaced with other ions of the same valence and size. For example, magnesium may be replaced by small amounts of iron and manganese, while aluminum may be replaced by high-valent iron. The openness of the α-cordierite crystal structure lays the foundation for the preparation and development of α-cordierite materia...

Claims

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Application Information

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IPC IPC(8): C03C10/00
CPCC03C10/0063
Inventor 赵鸣吴伟良李保卫陈华杜永胜贾晓林
Owner INNER MONGOLIA UNIV OF SCI & TECH
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