Light-weight cordierite castable and preparation method thereof

A light-weight castable, cordierite technology, applied in the field of light-weight castables, can solve the problems of poor thermal shock stability, flame erosion resistance, and poor resistance to medium erosion, and achieve good thermal shock stability and medium erosion resistance The effect of strong ability and convenient construction

Inactive Publication Date: 2012-11-07
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their thermal shock stability is poor, and their ability to resist flame erosion and medium erosion is poor, so they cannot be directly used in places where there is fire, corrosive medium, and large temperature fluctuations.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A cordierite lightweight castable and its preparation method: 50~70wt% porous cordierite ceramic particles, 20~38wt% cordierite ceramic fine powder, 2~6wt% calcium aluminate cement, 2~4wt% Talc fine powder, 2~4wt% silica fine powder and 2~4wt% activated α-alumina fine powder are raw materials, plus 8~12wt% water of the raw material and 0.02~0.4wt% sodium tripolyphosphate of the raw material , Stir evenly, and pour into molding; the molded green body is naturally dried for 24 hours, and then dried at 110°C for 8 to 18 hours.

[0020] In this embodiment: the apparent porosity of the porous cordierite ceramic particles is 35-40%, and the average pore diameter is 10-20 μm; the particle gradation ratio of the porous cordierite ceramic particles is: 8-5mm accounts for 8-12wt% of the raw material, 5 ~3mm accounts for 18~24wt% of raw materials, 3~1mm accounts for 18~24wt% of raw materials, and 1~0.1mm accounts for 6~10wt% of raw materials.

[0021] Adopt the technical scheme d...

Embodiment 2

[0023] A cordierite lightweight castable and its preparation method: 40~60wt% porous cordierite ceramic particles, 25~43wt% cordierite ceramic fine powder, 4~8wt% calcium aluminate cement, 2~4wt% Talc fine powder, 2~4wt% silicon oxide fine powder and 2~4wt% activated α-alumina fine powder are raw materials, plus 12~16wt% water of the raw material and 0.1~0.3wt% sodium tripolyphosphate of the raw material and 0.1~0.3wt% sodium hexametaphosphate, stir evenly, and pour into molding; the molded green body is naturally dried for 24 hours, and then dried at 110°C for 16~32 hours.

[0024] In this embodiment: the apparent porosity of the porous cordierite ceramic particles is 38-46%, and the average pore diameter is 20-30 μm; the particle gradation ratio of the porous cordierite ceramic particles is: 5-3mm accounts for 15-22wt% of the raw material, 3 ~1mm accounts for 15~22wt% of raw materials, and 1~0.1mm accounts for 10~16wt% of raw materials.

[0025] Adopt the technical scheme d...

Embodiment 3

[0027] A cordierite lightweight castable and its preparation method: 40-60wt% porous cordierite ceramic particles, 28-48wt% cordierite ceramic fine powder, 6-10wt% calcium aluminate cement, 2-4wt% Talc fine powder, 2~4wt% silica micropowder and 2~4wt% activated α-alumina micropowder are raw materials, plus 16~20wt% water of the raw material and 0.5~1wt% dispersible alumina of the raw material, Stir evenly and pour into molding; the molded green body is naturally dried for 24 hours, and then dried at 110°C for 30-48 hours.

[0028] In this embodiment: the apparent porosity of the porous cordierite ceramic particles is 45-55%, and the average pore diameter is 15-25 μm; the particle gradation ratio of the porous cordierite ceramic particles is: 3-1mm accounts for 15-25wt% of the raw material, 1 ~0.1mm accounts for 25~35wt% of raw materials.

[0029] Adopt the technical scheme described in this embodiment, obtain apparent porosity 45~58%, volume density is 1.22~1.40g / cm 3, Cordi...

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Abstract

The invention relates to a light-weight cordierite castable and a preparation method thereof. The technical scheme includes that the preparation method includes: using 40-70wt% of porous cordierite ceramic grains, 20-48wt% of cordierite ceramic fine powder, 2-10wt% of calcium aluminate cement, 2-4wt% of talcum fine powder, 2-4wt% of silicon oxide micro powder and 2-4wt% of active alpha alumina micro powder as raw materials, additionally adding water accounting for 8-20wt% of the raw materials and 0.02-1wt% of water reducers, uniformly stirring and molding by casting; and naturally drying molded green bodies for 24 hours and then drying the dried green bodies for 8-48 hours at the temperature of 110 DEG C. The light-weight cordierite castable prepared by the method not only has the advantages of high apparent porosity, small average pore size, high strength, low thermal conductivity, good thermal shock stability and high medium erosion resistance, but also has the advantages of convenience to construct, environmental friendliness, controllability in apparent porosity and pore size and small volume change after firing, and is applicable to backing layers or working layers of high-temperature kilns or containers at the working temperature lower than 1340 DEG C.

Description

technical field [0001] The invention belongs to the technical field of lightweight castables. In particular, it relates to a cordierite lightweight castable and a preparation method thereof. Background technique [0002] Cordierite is a silicate mineral with a theoretical composition of 2MgO 2Al 2 o 3 ·5SiO2 2 , has a small coefficient of thermal expansion, excellent thermal shock resistance, low thermal conductivity and good chemical stability. With the increasing requirements for energy saving and emission reduction, the research on environmentally friendly and efficient lightweight castables has attracted more and more attention. At present, research on cordierite lightweight materials at home and abroad mainly focuses on cordierite porous ceramic materials and cordierite lightweight refractory bricks. The former uses fly ash and coal gangue as raw materials to prepare cordierite porous materials (Wang Qi et al. Preparation of cordierite porous materials with fly ash...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 鄢文李楠魏耀武陈俊峰李媛媛刘光平
Owner WUHAN UNIV OF SCI & TECH
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