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Non-sintering densification method of corundum castable product

A castable and corundum-based technology, which is applied in the field of non-sintering densification of corundum castable products, can solve the problems of corundum castable products such as density, insufficient porosity, limited service life, and volatilization of strong corrosive atmospheres. , to achieve the effect of obvious densification effect, intact surface and high degree of material densification

Active Publication Date: 2015-02-04
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In actual production, the actual operating temperature (700°C-970°C) of fluoride salt molten salt furnaces, electrolytic cells for primary aluminum smelting, chloride molten salt furnaces, etc. is much lower than the sintering temperature of corundum castables (1400°C-1700°C) ℃), and a large amount of strong corrosive atmosphere volatilizes, resulting in insufficient density and porosity of corundum castable products, and limited service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Use corundum castable Al 2 o 3 The total percentage is greater than 90wt%. First, the corundum castable casing is made through batching, mixing, casting and molding processes. After the casing is dried at 110°C, it is completely immersed in molten salt at a temperature of 870°C. NaF / AlF in molten salt 3 The substance mass ratio is 1.6, the alumina concentration is greater than 10wt%, and the dense refractory castable is obtained by dynamic immersion for 1 hour.

[0039] The surface of the non-sintered densified refractory castable prepared in Example 1 is intact, uniform and dense after cutting, and the bulk density is 2.91 g / cm before erosion 3 Increased to 3.27g / cm 3 , the apparent porosity decreased from 16.25% before erosion to 6.56%, and the densification effect is obvious.

Embodiment 2

[0041] Use corundum castable Al 2 o 3 The total percentage is greater than 95wt%. Firstly, the corundum castable casing is made through batching, mixing, casting and molding processes. After the casing is dried at 110°C, it is completely immersed in molten salt at a temperature of 870°C. NaF / AlF in molten salt 3 The substance mass ratio is 1.6, the alumina concentration is greater than 10wt%, and the dense refractory castable is obtained by dynamic immersion for 3 hours.

[0042] The surface of the non-sintered densified refractory castable prepared in Example 2 is intact, uniform and dense after cutting, and the bulk density is changed from 3.01 g / cm before erosion 3 Increased to 3.37g / cm 3 , the apparent porosity decreased from 15.25% before erosion to 5.43%, and the densification effect was obvious.

Embodiment 3

[0044] Use corundum castable Al 2 o 3 The total percentage is greater than 95wt%. Firstly, the corundum castable casing is made through batching, mixing, casting and molding processes. After the casing is dried at 110°C, it is completely immersed in molten salt at a temperature of 870°C. NaF / AlF in molten salt 3 The substance mass ratio is 1.6, the alumina concentration is greater than 10wt%, and the dense refractory castable is obtained by dynamic immersion for 5 hours.

[0045] The surface of the non-sintered densified refractory castable prepared in Example 3 is intact, uniform and compact after cutting, and the bulk density is 3.10 g / cm before erosion 3 Increased to 3.45g / cm 3 , the apparent porosity decreased from 14.23% before erosion to 4.55%, and the densification effect was obvious.

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PUM

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Abstract

The invention provides a non-sintering densification method of a corundum castable product and relates to a non-sintering densification method of a corundum castable product in the field of fireproof materials. The non-sintering densification method is characterized in that a preparation process comprises the following steps of: (1) firstly, casting and molding corundum castable into a product and drying the product; (2) permeating and immersing the molded corundum castable product into smelted salt prepared by mixing sodium cryolite, aluminum fluoride and aluminum oxide; and (3) cooling the permeated and immersed corundum castable product, thus obtaining a densified finished product. The non-sintering densification method is simple in process and energy-saving; and the surface of the prepared non-sintering densification fireproof castable is intact and the castable is uniform and dense after being cut. The high-smelting-point smelted salt is used for permeating and the permeated smelted salt is not smelted again when the product is used in a low-temperature smelted salt surface, so that the further permeation of volatilized gas and smelted salt can be effectively blocked, and the service life of the corundum castable product is greatly prolonged.

Description

technical field [0001] The invention discloses a non-sintering densification method for corundum castable products, and relates to a non-sintering densification method for corundum castable products in the field of refractory materials. Background technique [0002] Corundum refractory castables are widely used in water-cooled pipes of heating furnaces, burner bricks, edge bricks, furnace mouths of soaking furnaces, furnace covers of refining furnaces and linings of power frequency induction furnaces; high-purity corundum refractory castables are used in large The triangle area of ​​the medium-sized ultra-high-power electric furnace cover and the key parts of the LF refining ladle cover and lining have become one of the most widely used refractory materials in the current metal smelting industry, kiln building materials industry, and ceramics industry. [0003] The porosity of corundum castable products is mostly between 12% and 20%, which can fully meet the conventi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/10C04B35/622
Inventor 包生重杨建红李致远李晓星
Owner GUIZHOU BRANCH CHINA ALUMINUM IND