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Method for synthesizing mullite refractory

A technology of refractory materials and synthesis methods, which is applied in the field of refractory materials, can solve the problems that the competitiveness of products is not as good as that of other similar products, enterprises have no profit margins, and the market demand is small, so as to achieve rich reserves, high mullite content, Inexpensive effect

Inactive Publication Date: 2013-03-27
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because when most of the research is applied to the actual production process, it will face many problems, such as high production cost, no profit margin for the enterprise; the competitiveness of the product is not as good as other similar products, and the market demand is small, etc.

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  • Method for synthesizing mullite refractory
  • Method for synthesizing mullite refractory
  • Method for synthesizing mullite refractory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Take the dry sludge provided by a certain company and pyrophyllite from a certain place as examples. Al in aluminum plant sludge 2 o 3 Content is 6116%, SiO 2 The content is 2.34%, the loss on ignition is 34.26%, and the Al in pyrophyllite 2 o 3 Content is 16.93%, SiO 2 The content is 78.41%, the main mineral composition is pyrophyllite and a small amount of quartz and kaolinite.

[0041] 2. Send the aluminum plant sludge and pyrophyllite to the ball mill for dry grinding. The input particle size of aluminum plant sludge is controlled within 1 mm, and the output particle size is controlled within 3 μm; the input particle size of pyrophyllite is controlled within 10 mm, and the output particle size is controlled within 5 μm.

[0042] 3. Send the milled aluminum mill sludge and pyrophyllite into the ball mill and add BaF 2 , and then add water for wet milling to obtain aluminum plant sludge-pyrophyllite mixed slurry. According to the mass ratio, aluminum plant ...

Embodiment 2

[0049] Raw material and technological process are with embodiment 1. BaF 2 The added amount is 0.5% of the aluminum plant sludge-pyrophyllite mixture. The size of the pressed green body is 5mm×4mm×50mm, and the molding pressure is 150MPa; the pressurization speed is controlled as: 5MPa / s when 0-50MPa; 10MPa / s when 50-100MPa; 5MPa / s when 100-150MPa s; holding time is 10s. The sintering temperature is 1350°C; the heating rate of the sintering process is controlled as follows: from room temperature to 900°C, 10°C / min; from 900 to 1200°C, 5°C / min; from 1200 to 1350°C, 3°C / min; the sintering time is 2h. The obtained sample forms three crystal phases, which are mullite, Al 2 o 3 , SiO 2 . Among them, the content of mullite is 97.8%, Al 2 o 3 content of 1.8%, SiO 2 The content is 0.4%. The flexural strength of the sample is 26.59MPa, the primary thermal shock retention rate is 86.9%, the refractoriness is 1650°C, and the bulk density is 2.16g / cm 3 , The apparent porosity is...

Embodiment 3

[0051] Raw material and technological process are with embodiment 1. BaF 2 The added amount is 0.5% of the aluminum plant sludge-pyrophyllite mixture. The size of the pressed green body is 300mm×300mm×100mm, and the molding pressure is 150MPa; the pressurization speed is controlled as: 3MPa / s when 0-50MPa; 5MPa / s when 50-100MPa; 3MPa / s when 100-150MPa s; holding time is 60s. The sintering temperature is 1375°C; the heating rate of the sintering process is controlled as follows: from room temperature to 900°C, 10°C / min; from 900 to 1200°C, 5°C / min; from 1200 to 1375°C, 3°C / min; the sintering time is 2h. The obtained sample forms three crystal phases, which are mullite, Al 2 o 3 , SiO 2 . Among them, the content of mullite is 96.5%, Al 2 o 3 content of 2.6%, SiO 2 The content is 0.9%. The flexural strength of the sample is 26.38MPa, the primary thermal shock retention rate is 82.6%, the refractoriness is 1600°C, and the bulk density is 2.12g / cm 3 , The apparent poros...

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Abstract

The invention provides a method for synthesizing a mullite refractory and relates to the refractory. The invention provides the method for synthesizing the mullite refractory, which has the advantages of simple technical process, low cost, and good performance and high purity of the synthesized mullite refractory. The method comprises the following steps of: feeding aluminum manufacturer sludge and pyrophyllite into a ball mill for dry grinding respectively; adding BaF2 or Na2SiF6 into a mixture of the ground aluminum manufacturer sludge and the ground pyrophyllite; adding water into the mixture for wet grinding to obtain a mixed slurry of the aluminum manufacturer sludge and the pyrophyllite; spraying the mixed slurry of the aluminum manufacturer sludge and the pyrophyllite into a prilling tower with a sprayer for atomizing and drying to obtain aluminum manufacturer sludge-pyrophyllite granules; feeding the aluminum manufacturer sludge-pyrophyllite granules into a hydraulic pressure molding machine for molding to obtain aluminum manufacturer sludge-pyrophyllite green bodies; drying the aluminum manufacturer sludge-pyrophyllite green bodies so as to reduce firing shrinkage and prevent samples from cracking; and sintering the dried aluminum manufacturer sludge-pyrophyllite green bodies, cooling the aluminum manufacturer sludge-pyrophyllite green bodies to the room temperature after sintering to obtain the mullite refractory.

Description

technical field [0001] The invention relates to a refractory material, in particular to two methods for synthesizing high-purity mullite refractory material at low temperature by adding a mineralizer. Background technique [0002] Mullite is an aluminosilicate mineral, which has the advantages of high refractoriness, thermal shock resistance, chemical corrosion resistance, creep resistance, high load softening temperature, good volume stability, and strong electrical insulation. It is an ideal high-grade Refractory materials are widely used in refractory industry, electronics, optics, high temperature structure and engineering materials and other fields. The synthesis temperature of mullite is high, and the energy consumption is also high. The temperature of conventional synthesis of mullite is above 1600°C. How to reduce the synthesis temperature under the premise of synthesizing high-purity mullite, thereby reducing energy consumption and production costs, and broadening ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/185C04B35/622
Inventor 罗学涛傅翠梨许庆水李锦堂
Owner XIAMEN UNIV
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