Method for preparing microcrystalline foam glass by using high titanium blast furnace slag and waste glass powder

A technology of microcrystalline foam glass and high titanium blast furnace slag, which is applied in glass manufacturing equipment, glass forming, manufacturing tools and other directions, can solve the problems affecting the application of new functional materials, high production equipment requirements, and reducing the mechanical properties of materials, etc. To achieve the effect of shortening the preparation period, good thermal insulation effect, and improving the use of added value

Inactive Publication Date: 2013-08-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the melting point of the high-titanium blast furnace slag used in this method is above 1350°C, and the introduced siliceous raw material is micro-silicon powder, its melting point is also higher than 1400°C, so the melting point of the basic ingredients is high, and the material needs to be processed at a very high temperature. It can be softened and melted, which not only requires high production equipment, but also consumes high energy
Secondly, because foaming and microcrystallization are carried out separately, two heat treatments are required, so the process is complicated and the preparation cycle is long, which greatly increases the production cost.
Moreover, the average pore size of the manufactured glass-ceramic foam is too large, and the pore wall becomes thinner, which will reduce the mechanical properties of the material and increase the water absorption rate, which will affect the application of the material as a new functional material.
[0006] To sum up, in the preparation of foamed glass-ceramics containing industrial waste slag as raw materials, due to the high softening temperature of the selected raw materials, high-temperature melting is usually required to prepare basic glass first, and then foamed glass-ceramics, and some researchers even The foaming and microcrystallization processes are carried out separately. These cumbersome processes undoubtedly increase the production process, increase the difficulty of production, and increase the production cost, thus limiting the popularization and application of microcrystalline foam glass to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]First, put the high-titanium blast furnace slag and waste glass powder into a ball mill and grind them to 200 meshes, then mix 10% of high-titanium blast furnace slag, 85% of waste glass powder, 1% of sodium tetraborate, 1% of calcium carbonate and 3% of sodium phosphate % Mix well in a ball mill; compact the mixed powder under a pressure of 5MPa, then put it into an electric furnace, and firstly dry and preheat it at a rate of 5°C / min from room temperature to 400°C for 30 minutes , then raised to 800°C at a heating rate of 15°C / min and held for 60 minutes for foaming and crystallization, then cooled to 600°C at a cooling rate of 20°C / min, and finally cooled at a rate of 2°C / min Slowly cool down to room temperature to obtain microceramic foam glass.

[0025] The bulk density of the glass-ceramic foam is 0.425g cm -3 ;The average pore diameter is 2.85mm;The thermal conductivity is 0.18w(m·k) -1 ; Water absorption is 4.5%; compressive strength is 10.8Mpa; flexural streng...

Embodiment 2

[0027] First put the high-titanium blast furnace slag and waste glass powder into a ball mill and grind them to 200 meshes, then mix 15% of high-titanium blast furnace slag, 75% of waste glass powder, 4% of sodium tetraborate, 2% of calcium carbonate and 4% of sodium phosphate % Mix well in a ball mill; compact the mixed powder under a pressure of 7MPa, then put it into an electric furnace, and firstly heat it up from room temperature to 300°C at a heating rate of 5°C / min and preheat it for 30 minutes , then raised to 850°C at a heating rate of 15°C / min and held for 45 minutes for foaming and crystallization, then cooled to 480°C at a cooling rate of 20°C / min, and finally cooled at a rate of 2°C / min Slowly cool down to room temperature to obtain microceramic foam glass.

[0028] The bulk density of the glass-ceramic foam is 0.483g cm -3 ;The average pore diameter is 2.52mm;The thermal conductivity is 0.20w(m·k) -1 ; Water absorption is 4.7%; compressive strength is 11.6Mpa; ...

Embodiment 3

[0030] First put the high-titanium blast furnace slag and waste glass powder into a ball mill and grind them to 300 meshes, then mix 20% of high-titanium blast furnace slag, 60% of waste glass powder, 11% of sodium fluorosilicate, 4% of sodium carbonate and hydrogen phosphate Disodium 5% is fully mixed in a ball mill; the mixed powder is compacted under a pressure of 5MPa, and then put into an electric furnace, and the temperature is raised from room temperature to 450°C at a heating rate of 4°C / min for pre-drying. Heat for 60 minutes, then raise the temperature to 700°C at a heating rate of 10°C / min and keep it warm for 30 minutes for foaming and crystallization, then cool it to 520°C at a cooling rate of 25°C / min, and finally cool it at a cooling rate of 1°C / min Slowly cool down to room temperature at a rate of 1 minute to obtain glass-ceramic foam.

[0031] The bulk density of the glass-ceramic foam is 0.528g cm -3 ;The average pore diameter is 2.31mm;The thermal conductiv...

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PUM

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Abstract

The invention discloses a method for preparing microcrystalline foam glass by using high titanium blast furnace slag and waste glass powder. The method comprises the following steps: grinding the high titanium blast furnace slag and waste glass powder, uniformly and fully mixing the high titanium blast furnace slag, the waste glass powder, a fluxing agent, a foaming agent and a foam stabilizer, pressing into a block, adding the mixture block into a heating device and preparing the microcrystalline foam glass at a low temperature according to a specific heat treatment process by using a one-step sintering method. According to the characteristic that the high titanium blast furnace slag which is rich in TiO2 can serve as a nucleation agent, the low-melting-point waste glass powder serves as a silicious raw material, a proper amount of corresponding fluxing agent and sintering process are matched, the preparation temperature is greatly reduced, and the preparation can be finished through one-step sintering; and therefore, the energy consumption can be reduced, the process is simplified, the cycle is shortened, the cost is saved, the product which is uniform in cells, moderate in cell diameter, low in volume density, low in water absorption rate, good in thermal insulation effect and high in mechanical strength can be obtained, and the additional value of high titanium blast furnace slag utilization is improved.

Description

technical field [0001] The invention belongs to the technical field of microcrystalline foam glass preparation, and in particular relates to a method for preparing microcrystalline foam glass by using high-titanium blast furnace slag and waste glass powder as main raw materials. Background technique [0002] Microcrystalline foam glass is a new type of multifunctional material, which is composed of three parts: glass phase, crystal and pores. Compared with foam glass, since there are more crystals distributed in the glass matrix with uniform pore structure, the formation of glass The crystal structure can significantly improve the mechanical properties of the material; compared with glass-ceramic, because it has more uniform pores distributed in the matrix intertwined with glass crystals, it can reduce the bulk density of the material and improve its thermal insulation performance at the same time. It is mainly used in【 Wang Chengyu, edited by Tao Ying. Glass Material Handb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C6/10C03C6/02C03B19/08
Inventor 冯可芹王海波周宇
Owner SICHUAN UNIV
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