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Preparing method for alumina-sol combined with castable

A technology of aluminum sol and castables, which is applied in the field of refractory materials, can solve problems such as inappropriateness, and achieve the effects of reducing firing temperature and improving high-temperature strength

Pending Publication Date: 2019-03-01
LUOYANG KECHUANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Silica sol bonded castables have obvious advantages over their cement bonded castables in terms of drying performance, medium and low temperature strength, and sintering performance, so they have been widely used, but there are also the following technical problems: it is not suitable for breathable brick materials that require no silicon system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] ①Mix: 30wt% 6-3mm tabular alumina, 20wt% 3-1mm tabular alumina, 15wt% 1-0mm tabular alumina, 23.9wt% 325 mesh corundum, 5wt% 325 mesh spinel , 3wt% of 3μm alumina powder, 3wt% of pure calcium aluminate and 0.1wt% of Castament FS65 water reducer were placed in a star mixer and stirred for 8 minutes to make a uniform mixture;

[0020] ② Molding: Add 7wt% aluminum sol of the uniform mixture to the above-mentioned star mixer, stir vigorously for 6 minutes, then pour into the mold, and vibrate for molding;

[0021] ③Conservation: Put the above-mentioned molded body together with the mold into the curing kiln, maintain it at 65°C for 6 hours, and demould to obtain the green body;

[0022] ④Drying: put the above body into a drying kiln, and dry it at 200°C for 15 hours to make an aluminum sol bonded castable.

[0023] The main physical properties of the aluminum sol bonded castable prepared in this example are: the apparent porosity is 15.6%, and the bulk density is 3.22g / cm ...

Embodiment 2

[0026] ① Mixing: 28wt% of 6-3mm white corundum, 22wt% of 3-1mm tabular alumina, 16wt% of 1-0mm tabular alumina, 17.9wt% of 325 mesh corundum, 10wt% of 325 mesh spinel, 4wt% of 3μm alumina micropowder, 2wt% of pure calcium aluminate and 0.1wt% of Castament FS65 water reducer were placed in a star mixer and stirred for 7 minutes to make a uniform mixture;

[0027] ②Molding: Add 7.5wt% aluminum sol as a homogeneous mixture to the above-mentioned star mixer, stir vigorously for 7 minutes, then inject into the mold, and vibrate for molding;

[0028] ③Conservation: Put the above-mentioned molded body together with the mold into the curing kiln, cure at 68°C for 8 hours, and demould to obtain the green body;

[0029] ④Drying: Put the above body into a drying kiln and dry it at 210°C for 16 hours to make an aluminum sol bonded castable.

[0030] The main physical properties of the aluminum sol bonded castable prepared in this example are: the apparent porosity is 16.1%, and the bulk ...

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PUM

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Abstract

The invention discloses a preparing method for alumina-sol combined with castable. The preparing method includes the following steps of mixing, forming, maintaining and drying. Alumina sol particles are formed to be evenly dispersed into a forming body, and in the following maintaining and drying process, solidified pure calcium aluminate cement is in-situ fixed in the castable; through the evenly-dispersed alumina sol particles, the castable has the high medium-and-low-temperature strength, a firm ceramic combination is formed after high-temperature firing, the firing temperature of the castable can be effectively reduced, and the energy-saving and cost-reducing effect is remarkable; alumina sol is a silicon-uncontained high-purity binding agent, and the high-temperature strength of the castable can be improved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a method for preparing aluminum sol-bonded castables. Background technique [0002] From the point of view of the bonding methods of amorphous refractory materials, there are various bonding forms such as chemical bonding, hydration bonding, and coagulation bonding, and various bonding agents are used, but the general development trend is from bonding agents that may introduce high impurities to It is possible to introduce low-impurity or even impurity-free binders, thereby greatly improving the purity and high-temperature service performance of materials. [0003] Silica sol bonded castables have obvious advantages over their cement bonded castables in terms of drying performance, medium and low temperature strength, and sintering performance, so they have been widely used, but there are also the following technical problems: it is not suitable for breat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101
CPCC04B35/101C04B2235/96C04B2235/77C04B2235/402C04B2235/3222
Inventor 马军强
Owner LUOYANG KECHUANG NEW MATERIAL CO LTD