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Preparation method of porous high-strength mullite refractory raw material

A refractory raw material, mullite technology, applied in the field of refractory raw materials, can solve the problems of complex preparation process of porous high-strength mullite refractory raw materials, and achieve the effects of low linear shrinkage, abundant raw material sources and low thermal conductivity

Inactive Publication Date: 2019-01-01
TONGDA REFRACTORY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a preparation method of porous high-strength mullite refractory raw material, which solves the problem of complex preparation process of porous high-strength mullite refractory raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Raw materials are weighed by weight percentage: 90wt% bauxite raw meal and 10wt% light bleaching beads. After preliminary mixing in the mixer, add 21wt% water of the above raw materials, further roll and mix evenly, and use semi-dry method to press to obtain the green body of refractory raw materials; put the green body into 110 ℃ electric blast drying Bake in the box for 24 hours, then put the dried green body into the sintering furnace, keep it at 1550°C for 3 hours, and the heating rate is 3°C·min -1 , After cooling, the porous high-strength mullite refractory raw material is obtained.

[0025] After testing, the porous high-strength mullite refractory raw material prepared by this embodiment has an apparent porosity of 31.3%, an average pore diameter of 32 μm, and a bulk density of 2.17 g·cm -3 , The compressive strength is 106.2MPa, and the thermal conductivity at 1000°C is 1.23w / m·k.

Embodiment 2

[0027] Weigh raw materials by weight percentage: 85wt% bauxite raw meal, 10wt% light bleaching beads and 8wt% aluminum hydroxide. First, mix and grind the light bleaching beads and aluminum hydroxide in a mixer, and after sieving, take the mixture with a particle size of less than 0.05mm as a pore-forming agent; then put the bauxite raw meal and pore-forming agent in a mixer Preliminary mixing, then adding 23wt% water of the above raw materials, further rolling and mixing evenly, and then adopting semi-dry machine pressing to obtain a green body of refractory raw materials; put the green body into an electric blast drying oven at 110°C and bake for 24 hours , and then put the dried green body into the sintering furnace, keep it at 1550°C for 3h, and the heating rate is 3°C·min -1 , After cooling, the porous high-strength mullite refractory raw material is obtained.

[0028] After testing, the porous high-strength mullite refractory material prepared by this embodiment has an ...

Embodiment 3

[0030] Weigh raw materials by weight percentage: 85wt% bauxite raw meal, 10wt% light bleaching beads and 8wt% aluminum hydroxide. First, mix and grind the light bleaching beads and aluminum hydroxide in a mixer, and after sieving, take the mixture with a particle size of less than 0.05mm as a pore-forming agent; then put the bauxite raw meal and pore-forming agent in a mixer Preliminary mixing, then adding 23wt% water of the above raw materials, further rolling and mixing evenly, and then adopting semi-dry machine pressing to obtain a green body of refractory raw materials; put the green body into an electric blast drying oven at 110°C and bake for 24 hours , and then put the dried green body into the sintering furnace, keep it at 1600°C for 3h, and the heating rate is 3°C·min -1 , After cooling, the porous high-strength mullite refractory raw material is obtained.

[0031] After testing, the porous high-strength mullite refractory material prepared by this embodiment has an ...

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Abstract

The invention discloses a preparation method of a porous high-strength mullite refractory raw material and belongs to the technical field of refractory raw materials. The preparation method comprisesthe specific steps that raw bauxite and a pore-forming agent are used as raw materials, water accounting for 10-40wt% of the raw materials is added, mixed grinding is carried out for even mixing, thenforming is carried out, and thus a refractory raw material green body is obtained; the green body is baked in an electrothermal blowing drying box with a baking condition of 110 DEG C for 24 hours, then the dried green body is put into a sintering furnace, the temperature is kept at 1,550 DEG C for 3 hours, heating is carried out with the heating rate of 3 DEG C.min<-1>, in-situ reaction sintering is carried out at high temperature, and thus a mullite crystal is generated; and the sintered mullite crystal is taken out of the furnace, cooled and then subjected to graded crushing, and thus theporous high-strength mullite refractory raw material is obtained. The preparation method has the advantages that the prepared porous high-strength mullite refractory raw material is small in pore size, even in pore diameter distribution, small in volume density, low in thermal conductivity, good in thermal stability, low in linear shrinkage rate and high in compression strength.

Description

technical field [0001] The invention belongs to the technical field of refractory raw materials, in particular to a method for preparing porous high-strength mullite refractory raw materials. Background technique [0002] As the country pays more and more attention to energy saving and environmental protection, the requirements for energy saving and emission reduction are getting higher and higher. Porous homogeneous bauxite with low thermal conductivity and high strength has become an ideal energy-saving refractory material. Its light-weight characteristics can effectively achieve the purpose of reducing the load of the kiln, lowering the temperature of the cylinder, and saving energy and environmental protection. At the same time, its internal porous structure can effectively conduct internal stress and improve the resistance of bauxite. Thermal Shock Properties. [0003] At present, there have been some literature reports on lightweight mullite materials. However, most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/185C04B38/08C04B38/02
CPCC04B35/185C04B35/66C04B38/08C04B2235/3217C04B2235/3218C04B2235/3418C04B2235/77C04B2235/96C04B2235/9607C04B2235/9615C04B38/02C04B38/0074C04B38/0067C04B38/0054
Inventor 叶航胡刚张海波高长贺李燕京
Owner TONGDA REFRACTORY TECH CO LTD
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