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Method for preparing porous glass ceramics by waste glass through low-temperature melting and high temperature foaming

A porous glass-ceramic and high-temperature foaming technology, which is applied in glass manufacturing equipment, glass molding, manufacturing tools, etc., can solve the problems of inability to control the mechanical and thermal conductivity of porous glass-ceramic, poor uniformity of pore size, opening and closing Pore ​​mixing and other problems, to achieve the effect of environmental protection, energy saving, high value-added utilization, controllable pore size, and controllable porosity

Inactive Publication Date: 2015-03-25
NANCHANG HANGKONG UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

In both methods, the gas generated by the thermal decomposition of the foaming agent during the sintering process expands in the sintered body to form bubbles, which are superimposed on the original pores inside the sintered body, resulting in poor uniformity of the pore size and mixed open and closed cells between the bubbles. , disorder, so that the mechanical and thermal properties of porous glass-ceramics cannot be adjusted

Method used

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  • Method for preparing porous glass ceramics by waste glass through low-temperature melting and high temperature foaming
  • Method for preparing porous glass ceramics by waste glass through low-temperature melting and high temperature foaming
  • Method for preparing porous glass ceramics by waste glass through low-temperature melting and high temperature foaming

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Crush and finely grind architectural glass plates into 45-120 micron glass powder, add 5% boric acid, 2% cryolite, 1% SiC and 3% CaCO 3 , after ball milling and mixing evenly, the mixed powder is evenly spread in a porcelain boat coated with alumina powder, and directly put into a rapid heating furnace that has been heated to 800°C. After constant temperature for 30 minutes, heat up to 980°C for 30 minutes , then lower the temperature to 650 ° C, keep the temperature constant for 60 minutes, and cool to room temperature with the furnace to obtain porous glass-ceramics. The results of crystal structure and optical microstructure analysis show that the main crystal phase in porous glass-ceramics is wollastonite and a small amount of cristobalite, and contains a large amount of glass phase (attached figure 1 ), the pore size is 50-100 microns (attached figure 2 ).

Embodiment 2

[0028] Crush and finely grind the glass plate of the fluorescent tube into a glass powder of 45-120 microns, add boric acid with a mass content of 8%, 4% V 2 o 5 and 5% CaCO 3 , after ball milling and mixing evenly, the mixed powder is evenly spread in a porcelain boat coated with alumina powder, and directly put into a rapid heating furnace that has been heated to 750°C. After 30 minutes of constant temperature, the temperature is raised to 900°C for 10 minutes. , then lower the temperature to 650 ° C, keep the temperature constant for 60 minutes, and cool to room temperature with the furnace to obtain porous glass-ceramics. The crystal structure test analysis shows that the sample is wollastonite containing a large amount of glass phase, and the pore size is 20-50 microns (attached image 3 ).

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Abstract

The invention relates to a method for preparing porous glass ceramics by waste glass through low-temperature melting and high-temperature foaming, and belongs to the field of energy-saving building materials. The method comprises technological steps as follows: (1), an appropriate quantity of a cosolvent, a crystallizing nucleating agent and a foaming nucleating agent are added to the waste glass subjected to crushing and fine grinding, the mixture is subjected to ball milling and uniform mixing, and mixed powder is obtained; (2), the mixed powder is uniformly spread in a refractory material mold and is directly put in a fast heating furnace, the temperature of the heating furnace is increased to 700-800 DEG C, and the mixed powder is molten at the constant temperature; (3), the molten mixed powder is subjected to constant-temperature foaming when the temperature is increased to 850-1,000 DEG C. According to two processes of low-temperature melting and high-temperature foaming by the waste glass, light-weight and high-strength porous glass ceramics mainly comprising closed pores are prepared quickly, and environment-friendly, energy-saving and large-scale waste glass recycling with high added value is realized.

Description

technical field [0001] The invention relates to the field of energy-saving building materials, in particular to a method for rapidly preparing porous glass-ceramics by melting waste glass at low temperature and foaming at high temperature. Background technique [0002] With the rapid development of science and technology and the continuous improvement of people's living standards, glass products have been widely used in many industries such as construction, chemical industry, transportation, and food and beverage. A large amount of daily glass waste and scientific research production glass waste are produced in the city every day, such as various chemical reagent bottles, wine and food and beverage packaging bottles, waste window glass and so on. The amount of glass waste in developed countries in Europe and the United States accounts for 4% to 8% of the total amount of urban waste, and the annual production of glass waste in my country is about 3.2 million tons, accounting ...

Claims

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Application Information

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IPC IPC(8): C03C10/14C03C11/00
CPCC03B19/08C03C10/0063
Inventor 卢金山陆章扬江龙祥
Owner NANCHANG HANGKONG UNIVERSITY
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