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Magnesium aluminate spinel castable and method for producing prefabricated brick by using castable

A technology of corundum magnesia-alumina spinel and magnesia-alumina spinel, which is applied in the field of refractory materials, can solve the problems of shortening the service life of corundum spinel prefabricated bricks, achieve short baking time on the line, long service life, and reduce labor intensity effect

Active Publication Date: 2014-01-01
ZHEJIANG ZILI HIGH TEMPERATURE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although pure calcium aluminate cement has no major problems in terms of bonding performance and use, because pure calcium aluminate cement contains a large amount of CaO, and CaO is an impurity in high-purity corundum spinel prefabricated bricks, in a certain To a certain extent, it will shorten the service life of corundum spinel prefabricated bricks

Method used

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  • Magnesium aluminate spinel castable and method for producing prefabricated brick by using castable
  • Magnesium aluminate spinel castable and method for producing prefabricated brick by using castable
  • Magnesium aluminate spinel castable and method for producing prefabricated brick by using castable

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Experimental program
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Effect test

Embodiment 1～6 and comparative example 1～2

[0063] Proportion the raw materials according to the composition of parts by weight listed in Table 1 and Table 2. First, mix the silica sol and the curing agent evenly, then put the rest of the components into the mixer and dry mix them for 1-3 minutes, and then put the pre-mixed Add the silica sol and curing agent into the mixer and stir evenly, pour the evenly stirred material into the corresponding vibrating mold, and vibrate while feeding, so that the pouring material can be evenly filled into the entire mold. After the feeding is completed, continue to vibrate until no air bubbles are discharged. ;

[0064] After standing at room temperature for 24 hours, the mold is demoulded, and the demoulded product is left to stand for another 24 hours, and then baked at 450°C for 48 hours to obtain prefabricated bricks.

[0065] In Table 1 and Table 2, the particle size of corundum A is 25-5mm; the particle size of corundum B is 5-1mm; the particle size of corundum C is 1-0.088mm; ...

Embodiment 1

[0069] The pH of silica sol in embodiment 1, embodiment 2 is 8.5; The pH of silica sol in embodiment 3, embodiment 4 is 9.0; The pH of silica sol in embodiment 5, embodiment 6 is 9.5; Embodiment 7, implementation The pH of silica sol in example 8 is 10.5;

[0070] Na in the silica sol that each embodiment uses 2 The mass fraction of O is not more than 0.7%; SiO 2 The mass fraction of silica sol is 30-40%, the density of silica sol at 20°C is 1.19-1.29kg / L, SiO 2 The particle size of the particle is 8-20nm, and the viscosity at 20°C is ≤20 centipoise.

[0071] The explosion-proof reinforcing fibers in Examples 1 to 4 are mixtures of polypropylene fibers and stainless steel fibers, wherein:

[0072] The weight ratio of polypropylene fiber and stainless steel fiber is 1:10 in embodiment 1 and 2;

Embodiment 3

[0073] The weight ratio of polypropylene fiber and stainless steel fiber in embodiment 3 is 1:3;

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Abstract

The invention discloses a magnesium aluminate spinel castable and a method for producing a prefabricated brick by using the castable. The magnesium aluminate spinel castable comprises the following raw material components in parts by weight: 20-50 parts of a first component, 10-30 parts of corundum B, 10-25 parts of a second component, 5-15 parts of a third component, 5-20 parts of a fourth component, 0.1-3.5 parts of anti-explosion reinforced fibers, 4-12 parts of silica sol and 0.01-1.0 part of a curing agent. The prefabricated brick which is produced from the magnesium aluminate spinel castable by using the method has a good high-temperature resistance property, a high anti-erosion ability and a high thermal shock resistance stability property, and is short in production time, long in service life and good in heat preservation effect.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a corundum magnesium aluminum spinel castable and a method for preparing prefabricated bricks using the castable. Background technique [0002] With the development of out-of-furnace refining and continuous casting technology, the ladle has gradually changed from a single-function vessel for containing molten steel to an out-of-furnace molten steel refining equipment with complex functions. [0003] The prolongation of the residence time of molten steel in the ladle and the increase of tapping temperature make the working environment of the ladle more harsh. In order to adapt to changes in the working environment of ladles, high-quality alumina-magnesia-carbon bricks and alumina-rich spinel carbon bricks are generally used in domestic ladles, but there are two aspects of ladles lined with alumina-magnesia-carbon bricks and alumina-rich spinel carbon bricks defect: [0004] F...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 沈明科
Owner ZHEJIANG ZILI HIGH TEMPERATURE TECH CO LTD
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