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Tempered refractory concrete block having controlled deformation

A kind of refractory concrete and concrete technology, which is applied in the covering layer of furnace hearth or tuyere, and in the field of preparing metallurgical furnace covering layer, which can solve the problems of low oxidation resistance and corrosion resistance

Active Publication Date: 2013-01-23
SAINT GOBAIN CENT DE RES & DEVS & DETUD EUROEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, said carbonaceous blocks have low resistance to oxidation and corrosion (due to melting), and the low resistance to oxidation and corrosion is even lower due to the high proportion of carbon in the form of graphite in the carbonaceous blocks

Method used

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  • Tempered refractory concrete block having controlled deformation
  • Tempered refractory concrete block having controlled deformation
  • Tempered refractory concrete block having controlled deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0177] Examples 1 and 2 are provided as comparative examples. Example 1 represents a product with very low alumina cement content, while Example 2 represents a carbonaceous product.

[0178] Table 1 clearly shows that the refractory concretes A and B according to the invention have a very poor air permeability and a very small median pore size, including the carbonaceous product relative to Example 1. The concrete according to the invention also has a higher resistance to corrosion from slag and smelts than products comprising alumina cement, and also has a higher corrosion resistance than the carbonaceous product of Example 2. High resistance to water vapor oxidation. In the application considered, the concrete according to the invention constitutes an optimal compromise.

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Abstract

Refractory concrete comprising a refractory aggregate bound by a binder matrix, the matrix representing between 10 and 60% by weight of the concrete and having a composition such that, in percentages by weight based on the matrix: - Al2O3 + SiO2 > 70% - 50 % > SiO2 > 10% alkaline-earth oxides: < 0.2%.

Description

technical field [0001] The present invention relates to rough machining Refractory concrete, processed Concrete and to prefabricated refractory blocks or finished refractory blocks obtainable from such rough concrete, and also to their use for the preparation of cladding for metallurgical furnaces In particular the use of the hearth or tuyere cover of a blast furnace (haut-fourneau). Background technique [0002] Refractory concrete usually consists of a mixture of aggregates and a hydraulic binder (liant hydraulic) based on alkaline earth metal oxides, in particular calcium aluminate (aluminate de chaux). This latter binder is commonly referred to as "cement". However, the presence of alkaline earth metal oxides in this concrete (called "casting" in English) impairs refractoriness and increases deformation under load. [0003] Also, these oxides react in reducing media. [0004] Thus, the refractory concrete described in EP0839775 as having essentially zero calcium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/103C04B35/101
CPCC04B2235/5454C04B2235/3418C04B2235/72C04B2235/3206C04B35/101C04B2235/3826C04B35/1015C04B35/103C04B2235/3218C04B2235/5427C04B2235/3241C04B35/66C04B2235/3208C04B2235/3244B82Y30/00
Inventor 弗里德里克·劳里特埃里克·乔治
Owner SAINT GOBAIN CENT DE RES & DEVS & DETUD EUROEN