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Preparation method of porous slurry green body

A porosity and slurry technology, applied in the field of ceramics and refractory materials, can solve the problems of uneven pore distribution, low compressive strength, and deformation of the body, and achieve the effect of small pore size, high production efficiency, and corrosion elimination.

Inactive Publication Date: 2010-08-04
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is: in order to solve the problem of uneven pore distribution, deformation, cracking and low compressive strength of the green body encountered in the process of preparing the low-density porous green body by the extrusion molding method of the combustible particle pre-filled slurry problems, high cost, environmental pollution, etc., and a physical foaming-casting method for preparing a porous slurry body is proposed, which can well solve the above technical problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) 239.3g of high alumina cement, 105.3g of Suzhou soil, 471.4g of pyrophyllite, 28.2g of lime, 45.3g of limestone, 110.5g of waste brick materials, mixed according to the proportion, stirred for 10 minutes to make it fully homogenized; The composition (mass) range is: CaO: 12.89%, SiO 2 : 48.10%, Al 2 o 3 : 35.26%, Fe 2 o 3 : 0.55%, other (impurities) 3.20%.

[0024] 2) Add an appropriate amount of water to the mixture, control the water-solid mass ratio of the slurry to 0.67, and mechanically stir to prepare a uniform and fluid slurry;

[0025] 3) Dilute the rosin foaming agent (NJFA) with water, the dilution mass ratio is 1:11, put it into the pneumatic foaming device, turn on the compressed air, and foam;

[0026] 4) Add an appropriate amount of foam directly to the fluid mixture slurry prepared in step 2), and stir for 5 minutes to make the foam evenly distributed in the slurry;

[0027] 5) Determination of the wet bulk density of the foam slurry is 0.58kg / m ...

Embodiment 2

[0037] 1) 192.2g of high alumina cement, 223.9g of Suzhou soil, 387.5g of pyrophyllite, 21.4g of lime, 56.7g of limestone, and 118.2g of waste brick materials, mixed according to the proportion, stirred for 10 minutes to make it fully homogenized; The composition (mass) range is: CaO: 13.66%, SiO 2 : 46.01%, Al 2 o 3 : 37.22%, Fe 2 o 3 : 0.57%, other 2.54%.

[0038] 2) Add an appropriate amount of water to the mixture, control the water-solid mass ratio of the slurry to 0.65, and mechanically stir to prepare a uniform and fluid slurry;

[0039] 3) The protein (EAB) foaming agent is diluted with water, the dilution mass ratio is 1:16, put into the pneumatic foaming device, open the compressed air, and foam;

[0040] 4) Add an appropriate amount of foam directly to the fluid mixture slurry prepared in step 2), and stir for 10 minutes to make the foam evenly distributed in the slurry;

[0041] 5) Measure the wet bulk density of the foam slurry to be 0.63kg / m 3 ;

[0042] 6)...

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Abstract

The invention relates to a preparation method of a porous slurry green body, belonging to the technical field of ceramic and refractory materials. The method comprises five steps of: foam preparation, slurry blending, foam and slurry mixing, green body pouring and green body maintenance. The invention specifically comprises the following steps of: prefabricating bubbles in advance under the action of compressed air through a foaming device by adopting a physical foaming agent so as to provide fine, uniform and stable bubbles; and mixing high-alumina cement, Suzhou clay, pyrophyllite, lime and calcium carbonate according to a required proportion and then adding water to prepare a prefabricated slurry, wherein in the slurry, the high-alumina cement is used as one of ingredients to provide aluminum oxide and calcium oxide, and meanwhile, the characteristics of fast-solidification and fast-hardening of the high-alumina cement are adopted to accelerate the solidification and the hardening of pouring a green pouring body so as to ensure that on one hand, the bubbles are fixed as soon as possible to reduce bubble loss, and on the other hand, the green body is enhanced to reduce the deformation of the green body. The invention can easily prepare a green body with a drying density of 0.34-0.45kg / m<3>, and the compression strength of a corresponding drying green body is 0.15-0.50MPa.

Description

technical field [0001] The invention relates to a method for preparing a low-density porous slurry body (hereinafter referred to as "green body") which is a precursor of a lightweight heat-insulating brick suitable for high-temperature environments, and belongs to the technical field of ceramics and refractory materials. Background technique [0002] High-temperature kilns are often used in industrial production and scientific research activities. In order to ensure the normal operation of the kiln and improve energy utilization efficiency, it is usually necessary to use lightweight heat-insulating bricks on the outer layer on the basis of using refractory bricks in the inner layer of the kiln. Most of the lightweight insulation bricks used at temperatures between 1230°C and 1500°C are ceramic porous sintered bodies, and the corresponding density fluctuations are between 0.50-1.50kg / m 3 Between, the corresponding thermal conductivity fluctuates in 0.25-0.50w / mK. The core pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B35/10C04B35/14
Inventor 潘志华刘强
Owner NANJING TECH UNIV
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