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Micro-crystallization method for preparing glass ceramics with blast furnace slag

A blast furnace slag and glass-ceramic technology, applied in the field of micro-crystallization, can solve the problems of limited amount of crystallized glass, no nucleation stage, low material strength, etc., achieve high market price, save a lot of energy, The effect of reducing production costs

Inactive Publication Date: 2016-08-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods have practical problems and limitations in the operation process. After the glass liquid is formed and slightly cooled, the corresponding microcrystallization can be performed. This method has process defects in the preparation process of glass-ceramic materials. It will cause the temperature to be too high without going through the necessary nucleation stage, the amount of crystallization of the prepared glass-ceramics is limited, and the strength of the material is generally low

Method used

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Effect test

Embodiment 1

[0026] A method for preparing glass ceramics from blast furnace slag, which uses blast furnace slag as the main raw material and prepares batch materials with auxiliary materials; after melting the batch materials, the obtained glass liquid is cast into a glass body, and the formed After the glass body is shaped, it is microcrystallized and annealed to obtain high-performance glass-ceramics. The specific steps are as follows:

[0027] (1) The selected blast furnace slag has a chemical composition of: SiO 2 30wt%, Al 2 o 3 17wt%, CaO 40wt%, MgO 7wt%, Fe 2 o 3 2wt%, TiO 2 3wt%, MnO 2 1wt%, the auxiliary materials added are quartz sand, alumina stone powder, zinc white, antimony white, pyrolusite, soda ash, barium carbonate, sodium fluoroaluminate and titanium oxide;

[0028] Wherein, based on the total mass of blast furnace slag and auxiliary materials, the amount of blast furnace slag added is 55wt%, and the amount of auxiliary materials added is 45wt%. The chemical ...

Embodiment 2

[0035] A method for preparing glass ceramics from blast furnace slag, which uses blast furnace slag as the main raw material and prepares batch materials with auxiliary materials; after melting the batch materials, the obtained glass liquid is cast into a glass body, and the formed After the glass body is shaped, it is microcrystallized and annealed to obtain high-performance glass-ceramics. The specific steps are as follows:

[0036] (1) The selected blast furnace slag has a chemical composition of: SiO 2 35wt%, Al 2 o 3 15wt%, CaO 40wt%, MgO 7wt%, Fe 2 o 3 1.5wt%, TiO 2 1wt%, MnO 2 0.5wt%, the added auxiliary materials are quartz sand, bauxite powder, zinc white, antimony white, pyrolusite, soda ash, barium carbonate, sodium fluoroaluminate and titanium oxide;

[0037] Wherein, based on the total mass of blast furnace slag and auxiliary materials, the amount of blast furnace slag added is 62wt%, and the amount of auxiliary materials added is 38wt%. The chemical co...

Embodiment 3

[0044] A method for preparing glass ceramics from blast furnace slag, which uses blast furnace slag as the main raw material and prepares batch materials with auxiliary materials; after melting the batch materials, the obtained glass liquid is cast into a glass body, and the formed After the glass body is shaped, it is microcrystallized and annealed to obtain high-performance glass-ceramics. The specific steps are as follows:

[0045] (1) The selected blast furnace slag has a chemical composition of: SiO 2 35wt%, Al 2 o 3 15wt%, CaO 35wt%, MgO 10wt%, Fe 2 o 3 2wt%, TiO 2 2.5wt%, MnO 2 0.5wt%, the added auxiliary materials are quartz sand, bauxite powder, zinc white, antimony white, pyrolusite, soda ash, barium carbonate, sodium fluoroaluminate and titanium oxide;

[0046] Wherein, based on the total mass of blast furnace slag and auxiliary materials, the amount of blast furnace slag added is 62wt%, and the amount of auxiliary materials added is 38wt%. The chemical c...

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Abstract

The invention relates to a micro-crystallization method for preparing glass ceramics with blast furnace slag, characterized by mainly comprising the three steps: (1), cooling shaped glass blank to transition temperature of blast furnace slag basic glass, holding the temperature for 5-8 min, and homogenizing the temperature; (2), after step (1), heating the glass blank to glass nucleating temperature, holding the temperature for 40-90 min, and nucleating; (3), after nucleating, heating the glass blank continuously to glass micro-crystallization temperature, holding the temperature for 40-90 min, and crystallizing to obtain pre-annealing glass ceramic. Before nucleating and crystallizing the hot glass blank, there is a need to reduce its temperature to transition temperature of corresponding blast furnace slag basic glass, thereby ensuring that glass nucleating and crystallizing process is scientific and harmonious and ensuring that the prepared glass ceramic is high in strength and density; meanwhile, the glass blank that is hot is heated from temperature Tg, so that energy can be saved greatly.

Description

technical field [0001] The invention relates to a microcrystallization method for preparing glass-ceramics from blast furnace slag, and the method is particularly suitable for the field of preparing high-performance engraving materials. Background technique [0002] Blast furnace slag is the waste discharged from the blast furnace when the pig iron is smelted. When the furnace temperature reaches 1400-1600 ° C, the furnace charge is melted, and the gangue in the ore, the ash in the coke, the flux and other impurities that cannot enter the pig iron are formed. Silicates and aluminates are the main slags floating on the molten iron. The main components of blast furnace slag are CaO and SiO 2 、Al 2 o 3 . Blast furnace slag is an industrial solid waste, about 0.3 tons of slag is discharged per ton of iron smelting, the lower the ore grade, the greater the slag discharge. There are about 100 million tons of blast furnace slag accumulated in my country's slag yards. If it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B32/02C03C10/16
CPCC03B32/02C03C10/0036C03C10/16
Inventor 何峰施江张文涛谢峻林刘小青
Owner WUHAN UNIV OF TECH
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