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Method for preparing microcrystalline glass by using blast furnace slag

A technology for glass-ceramic and blast furnace slag, which is applied in the field of preparation of glass-ceramic materials, can solve the problems of low utilization rate of slag, high cost, complicated preparation process, etc., and achieve the effects of saving resources, reducing pollution and avoiding complex processes

Inactive Publication Date: 2008-09-10
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing glass-ceramics with a high proportion of slag, so as to overcome the shortcomings of the existing glass-ceramic preparation process, such as complicated process, high cost, and low utilization rate of slag.

Method used

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  • Method for preparing microcrystalline glass by using blast furnace slag
  • Method for preparing microcrystalline glass by using blast furnace slag

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Experimental program
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Effect test

Embodiment 1

[0018] (1) The composition of the slag used is: SiO 2 33wt%, Al 2 o 3 is 13wt%, CaO is 38wt%, and MgO is 9wt%. The glass-ceramic raw material composition is 95wt% slag and 5wt% feldspar.

[0019] (2) The blast furnace slag raw material is ball milled for 48 hours, passed through a 200 mesh sieve and equipped with feldspar additive, and the fineness of the additive is 200 mesh;

[0020] (3) Ball milling and mixing for 10 hours to make a slurry, wherein the ratio of material, balls, and water is 1:1.5:1.5, dry the slurry at 60°C until the water content is ≤5%, add glycerin to granulate, and press to form under 20MPa;

[0021] (4) Crystallize at 850°C for 2 hours, sinter at 1170°C for 1 hour, and the heating rate is 5°C / min. After polishing, the slag glass-ceramic is obtained, and the main crystal phase is calcium yellow feldspar (2CaO·Al 2 o 3 ·SiO2 2 ). The density of the prepared glass-ceramic is 2.67g / cm 3 , Vickers hardness is 4.65GPa, water absorption rate is 0.11%....

Embodiment 2

[0024] The raw material composition of glass-ceramic is 95wt% slag, 5wt% feldspar. The pre-process conditions are as in Example 1, the ratio of material, balls and water is 1.5:2:1.5 when the ball mill is mixed to prepare the slurry, and the slurry is dried at 80°C until the water content is ≤4%, and then 3% by weight of water is added to granulate , Tablet crystallization and sintering parameters are compression molding at 30MPa, crystallization at 950°C for 1 hour, sintering at 1150°C for 2 hours, and a heating rate of 2°C / min. After polishing, the slag glass-ceramic with calcium feldspar as the main crystal phase is obtained. The density of glass-ceramic is 2.75g / cm 3 , Vickers hardness is 5.15GPa, water absorption rate is 0.20%.

Embodiment 3

[0026] The raw material composition of glass-ceramic is 92wt% slag, 3wt% zircon and 5wt% feldspar. The pre-process conditions are as in Example 1, the ratio of material, balls, and water is 2:1:1 when the ball mill is mixed to prepare the slurry, and the slurry is dried at 90°C until the moisture content is ≤3%, and then water with a weight ratio of 5% is added to granulate , Tablet crystallization and sintering parameters are compression molding at 40MPa, crystallization at 900°C for 1 hour, sintering at 1200°C for 1.5 hours, and a heating rate of 10°C / min. After polishing, the slag glass-ceramic with calcium feldspar as the main crystal phase is obtained. The density of glass-ceramic is 2.78g / cm 3 , the Vickers hardness is 5.20GPa, and the water absorption rate is 0%.

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Abstract

The invention discloses a method used for the preparation of microcrystalline glass by use of blast furnace slag, wherein blast furnace slag is crushed and sifted out and then is mixed with 0 to 10 wt percent of feldspar and 0 to 5 wt percent of zirconite to make mixed powder material with the weight proportion of blast furnace slag no less than 85 percent; then, the mixed powder material is made into slurry through ball milling mixing and agglomerant is added in after the slurry is dried to complete granulation; and finally, microcrystalline glass is made through direct tabletting crystallizing sintering. The method has the advantages that: (1) ironmaking blast furnace slag is adopted as main material with the addition amount of the blast furnace slag reaching more than 85 percent, which not only saves resources and reduces pollution, but also realizes cycle economy; (2) cheap silicate materials including zirconite and feldspar are adopted as additives; (3) powder tabletting sintering method is adopted to make microcrystalline glass, thereby omitting the complex process of casting moulding after high-temperature fusion of glass or sintering after fusion water quench in the prior glass process and sintering process.

Description

technical field [0001] The invention relates to a preparation process of a glass-ceramic material, in particular to a method for preparing a glass-ceramic material by using ironmaking blast furnace slag. Background technique [0002] The slag discharged from the blast furnace ironmaking process, also known as blast furnace slag, is a kind of industrial solid waste. Depending on the grade of the ore, 0.3 to 1 ton of slag is discharged for every ton of iron smelted, and the lower the grade of the ore, the greater the amount of slag discharged. Water slag is to quench molten blast furnace slag with water or a mixture of water and air to make it a sandy glassy substance. This is also the main method for processing blast furnace slag in my country. Disposal of slag will occupy land, waste resources and pollute the environment. After the middle of the 20th century, the comprehensive utilization of foreign blast furnace slag developed rapidly. At present, many countries such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/00C03B32/02C03C6/10
Inventor 卢红霞李利剑张伟关绍康
Owner ZHENGZHOU UNIV
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