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Preparation method of high-strength low-thermal-conductivity zirconium oxide complex-phase refractory insulating brick

A technology of refractory thermal insulation bricks and zirconia, applied in the field of refractory thermal insulation bricks, can solve the problems of product compressive strength, undisclosed thermal conductivity of load softening starting temperature, high raw material cost, high firing temperature, etc., so as to realize waste recycling. , Conducive to industrial production, the effect of reducing production costs

Inactive Publication Date: 2020-08-18
SHANDONG JIATENG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the raw materials of refractory insulation bricks of various materials are basically sawdust, polylight balls, kaolin, bauxite clinker, etc., but the products made of the above raw materials are high-alumina or silicon-aluminum products, and there are many types of impurities. The impurity content is high, the high temperature resistance and thermal insulation effect of the product are relatively poor, and it is difficult to meet the thermal insulation requirements of high temperature and light thermal equipment
[0004] Zirconia material not only has the advantages of high melting point, high strength, extremely low thermal conductivity, good chemical stability (erosion resistance), but also has the advantages of high strength, high temperature resistance, corrosion resistance, low thermal conductivity, and good heat preservation effect , but the higher firing temperature and higher cost of raw materials are also one of the reasons why it is difficult to popularize
[0005] CN 101229979A discloses a heat-insulating universal brick and its manufacturing method, which uses 10-15% bauxite, 15-25% synthetic mullite, 25-30% kaolin, 1-3% wood chips, 10 -18% poly light balls and 15-20% floating beads are compatible, have excellent high temperature resistance and heat insulation, and are used as heat-insulating, refractory and heat-insulating materials for special steel cast steel dies, but they are made of alumina- Silicon oxide-based materials, only disclosed that the density of the prepared product is 0.65-0.72g / cm 3 , the compressive strength, load softening start temperature, and thermal conductivity of the product are not disclosed

Method used

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  • Preparation method of high-strength low-thermal-conductivity zirconium oxide complex-phase refractory insulating brick
  • Preparation method of high-strength low-thermal-conductivity zirconium oxide complex-phase refractory insulating brick

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Pour an appropriate amount of castor oil into the polylight balls to impregnate, and the castor oil consumption is as the criterion that the polylight balls are all immersed in the castor oil;

[0031] (2) 37.5% of zirconia hollow spheres with a diameter of 1-2mm, 17% of calcium-stabilized zirconia fine powder with a particle size of 20-50 μm, and 13% of calcium-stabilized zirconia fine powder with a particle size of 5-10 μm, with a particle size of 28% of floating beads of 0.5-4mm, 1% of polylight balls with a diameter of 0.5-1mm impregnated with castor oil, 3.5% of 20% concentration of cellulose aqueous solution, mixed for 3 hours, and pressed under a pressure of 40MPa After molding and drying at room temperature for 72 hours, it is fired in a kiln at a firing temperature of 1550°C for 2 hours.

[0032] The refractory insulation bricks made have the following properties:

[0033] Bulk density 1.40g / cm 3 ;

[0034] The compressive strength at room temperature is...

Embodiment 2

[0040] (1) Pour an appropriate amount of castor oil into the polylight balls to impregnate, and the castor oil consumption is as the criterion that the polylight balls are all immersed in the castor oil;

[0041] (2) 30% of zirconia hollow balls with a diameter of 0.5-1mm, 8% of polylight balls with a diameter of 0.5-1mm impregnated with castor oil, and 20% of calcium-stabilized zirconia fine powder with a particle diameter of 50-80 μm, 15% of calcium-stabilized zirconia micropowder with a diameter of 5-10 μm, 23% of floating beads with a particle size of 0.5-4mm, and 4% of a 15% calcium lignosulfonate aqueous solution. Compressed under high pressure, dried at room temperature for 24 hours, then fired in a kiln at 1500°C for 8 hours.

[0042] The refractory insulation bricks made have the following properties:

[0043] Bulk density 1.16g / cm 3 ;

[0044] The compressive strength at room temperature is 7.6MPa;

[0045] 0.1MPa load softening start temperature 1590℃;

[0046]...

Embodiment 3

[0050] (1) Pour an appropriate amount of castor oil into the polylight balls to impregnate, and the castor oil consumption is as the criterion that the polylight balls are all immersed in the castor oil;

[0051] (2) 48% of zirconia hollow balls with a diameter of 0.5-2mm, 5% of polylight balls with a diameter of 0.5-1mm impregnated with castor oil, and 12% of calcium-stabilized zirconia fine powder with a particle diameter of 50-80 μm, 10% calcium stabilized zirconia micropowder with a diameter of 5-10μm, 22% floating beads with a particle diameter of 0.5-4mm, 3% aqueous solution of calcium lignosulfonate with a concentration of 15%, and after mixing for 5 hours, the Compressed under high pressure, dried at room temperature for 36 hours, then fired in a kiln at 1550°C for 4 hours.

[0052] The refractory insulation bricks made have the following properties:

[0053] Bulk density 1.05g / cm 3 ;

[0054] The compressive strength at room temperature is 7.2MPa;

[0055] 0.1MPa ...

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Abstract

The invention relates to a preparation method of a high-strength low-thermal-conductivity zirconium oxide complex-phase refractory insulating brick, and belongs to the technical field of refractory insulating bricks. The preparation method of the high-strength low-thermal-conductivity zirconium oxide complex-phase refractory insulating brick comprises the following steps that: with zirconium oxidehollow spheres, calcium-stabilized zirconium oxide fine powder, calcium-stabilized zirconium oxide micro powder and floating beads taken as raw materials, an adhesive and poly-light spheres are added; andmixing, ageing, compression molding, drying and sintering are performed to obtain the high-strength low-thermal-conductivity zirconium oxide complex-phase refractory insulating brick. The productprepared by the invention not only has higher strength, but also has low thermal conductivity and low production cost, and has remarkable economic benefits.

Description

technical field [0001] The invention relates to a preparation method of a high-strength and low-thermal-conduction zirconia composite phase refractory and heat-preserving brick, and belongs to the technical field of refractory and heat-retaining bricks. Background technique [0002] All kinds of thermal equipment are important facilities in industrial production and are also large energy consumers. Therefore, the heat insulation layer and refractory layer of various thermal equipment must use refractory bricks for heat preservation, refractory and heat insulation, so all kinds of refractory Bricks are the guarantee for the long-term safe use of thermal equipment, energy saving and consumption reduction to obtain greater economic benefits. [0003] In order to meet the needs of the market, many refractory insulation brick enterprises have developed low thermal conductivity and high strength refractory insulation bricks. At present, the raw materials of refractory insulation ...

Claims

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Application Information

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IPC IPC(8): C04B35/482
CPCC04B35/482C04B2235/3208C04B2235/3217C04B2235/3418C04B2235/5427C04B2235/5436C04B2235/602C04B2235/656C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607
Inventor 张昂王海啸韩伟向帅
Owner SHANDONG JIATENG IND CO LTD
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