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Method utilizing high-ferrosilicon tailings to manufacture low-expansion microcrystalline glass

A glass-ceramic and low-expansion technology, applied in the field of manufacturing low-expansion glass-ceramics, can solve the problems of high raw material cost, high melting temperature, and inability to use iron tailings, etc., to reduce energy consumption, increase melting speed, The effect of improving furnace efficiency

Inactive Publication Date: 2010-07-28
BEIJING QING MAI HUA QING HLDG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for manufacturing low-expansion glass-ceramics by using high-silicon iron tailings, which solves the problems that iron tailings cannot be used in the existing glass-ceramics manufacturing method, the cost of raw materials is high, and the melting temperature is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The glass batch is made by weighing and mixing, and its composition is as follows in weight percentage: iron tailings 30, quartz 45, aluminum oxide 17, lithium carbonate 9.6, zinc oxide 1.0, barium carbonate 2.0, boric acid 0.8, titanium oxide 2.0, oxide Zirconium 2.0.

[0018] Melt the above glass at a temperature of 1600°C for 4 hours; pour the molten glass into a disc with a diameter of 100mm and a thickness of 5mm, and immediately send it to a furnace for annealing at a temperature of 680°C for 1 hour ;After the annealing is completed, the temperature is raised directly for nucleation and crystallization. The nucleation temperature is 700°C for 1.5 hours, and the crystallization temperature is 810°C for 2 hours; A finished product with uniform crystallization and a grain size smaller than 50 nanometers can be obtained. The expansion coefficient of the product is 5×10-7 / ℃, the bending strength is 100Mpa, and the product color is transparent dark brown.

Embodiment 2

[0020] The glass batch is made by weighing and mixing, and its composition is as follows in weight percentage: iron tailings 35, quartz 40, aluminum oxide 18, lithium carbonate 7.6, zinc oxide 1.0, barium carbonate 2.0, boric acid 0.8, titanium oxide 4.0, oxide Antimony 1.0.

[0021] Melt the above glass at a temperature of 1580°C for 4 hours; pour the molten glass into a disc with a diameter of 100mm and a thickness of 5mm, and immediately send it to a furnace for annealing at a temperature of 670°C for 1 hour ;After the annealing is completed, the temperature is raised directly for nucleation and crystallization. The nucleation temperature is 700°C for 1.5 hours, and the crystallization temperature is 950°C for 2 hours; A finished product with uniform crystallization and a grain size of less than 1000 nanometers can be obtained. The expansion coefficient of the product is 12×10-7 / ℃, the bending strength is 140Mpa, and the product color is opaque light brown.

Embodiment 3

[0023] The glass batch is made by weighing and mixing, and its composition is by weight percentage: 35% iron tailings, 40% quartz, 18% aluminum oxide, 9.6% lithium carbonate, 2.0% barium carbonate, 2.0% titanium oxide, and 2.0% zirconium oxide.

[0024] Melt the above glass at a temperature of 1560°C for 4 hours; pour the molten glass into a disc with a diameter of 100 mm and a thickness of 5 mm, and immediately send it to a furnace for annealing at a temperature of 620°C for 1 hour ;After the annealing is completed, the temperature is raised directly for nucleation and crystallization. The nucleation temperature is 680°C for 1.5 hours, and the crystallization temperature is 780°C for 2 hours; A finished product with uniform crystallization and a grain size smaller than 50 nanometers can be obtained. The expansion coefficient of the product is 8×10-7 / ℃, the bending strength is 100Mpa, and the product color is transparent dark brown.

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Abstract

The invention provides low-expansion microcrystalline glass. The low-expansion microcrystalline glass is characterized in that the combination of the proportioning ratio according to the weight percent is as follows: iron tailings: 30 to 35; quartz: 40 to 45; alumina: 16 to 18; lithium carbonate: 5 to 10; zinc oxide: 0.2 to 2; barium carbonate: 0.1 to 2; boric acid: 0.1 to 1; the resultant of the zinc oxide, the barium carbonate and the boric acid: 1 to 4; titanium oxide: 1 to 4; zirconia: 1 to 4; and the resultant of the titanium oxide and the zirconia: 3 to 5. With the characteristics of reducing environmental pollution, improving product performance and lowering production cost, the invention solves the problem of utilizing wastes to manufacture the low-expansion microcrystalline glass.

Description

technical field [0001] The invention relates to a low-expansion glass-ceramic and a method for manufacturing the low-expansion glass-ceramic. Background technique [0002] It has been more than half a century since people invented glass-ceramics in the late 1950s, and many research institutions and manufacturers at home and abroad have carried out a lot of development and research work in this area. So far, glass-ceramic has formed a special category of materials, with various varieties and different properties, and has a very wide range of uses. [0003] Glass-ceramic is a polycrystalline material obtained by controlling the crystallization of glass. Low-expansion glass-ceramics mainly refers to Li2O-Al2O3-SiO2 system glass-ceramics. Because it has excellent properties in four aspects: temperature shock resistance, high frequency insulation, high mechanical strength, and high chemical stability, it can be widely used in astronomical telescopes, high-temperature electric l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/14
Inventor 黄西江
Owner BEIJING QING MAI HUA QING HLDG GRP CO LTD
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