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High-density high-strength alumina self-flow castable

An alumina and castable technology, which is applied in the field of dense and high-strength alumina self-flowing castables, can solve problems such as poor spalling resistance and other high temperature properties, reduced material refractoriness, and segregation of granular materials and matrix materials. The effect of continuous and reasonable distribution of grades, good construction performance, and uniform and dense structure

Active Publication Date: 2013-10-30
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the previous self-flowing castable system, in addition to improper selection of materials, improper selection and addition of water reducing agent, is mainly due to unreasonable particle size distribution, resulting in poor fluidity or no self-flowing castables.
In order to improve fluidity, the amount of water added is only one-sidedly increased. The result is that the castable has high porosity and low strength, and even causes segregation between the granular material and the matrix material; at the same time, the system has a high content of impurity phases, and low-melt phases are easily formed at high temperatures, resulting in refractory materials. High-temperature performance such as lowering of temperature, erosion resistance, and peeling resistance becomes worse, and cannot match the life of other materials, which restricts its application

Method used

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  • High-density high-strength alumina self-flow castable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The raw materials and ratio of the alumina-based self-flowing castable are (the ratio of the raw materials is the mass percentage):

[0036] aggregate:

[0037] Tabular alumina particles 6-3mm 28%

[0038] Tabular alumina particles 3-1mm 7%

[0039] Tabular alumina particles 1-0.5mm 10%

[0040] Tabular alumina particles 0.6-0.2mm 9%

[0041] Tabular alumina particles 0.2-0.045mm 6%

[0042] Matrix:

[0043] Tabular corundum fine powder 45-20um 5%

[0044] Tabular corundum fine powder 20-5um 16%

[0045] а-Al 2 o 3 Micropowder 5-0.1um 14%

[0046] CA-70 cement 5%

[0047] Oxalic acid (retarder) +0.01%

[0048] Polycarboxylate-based polymer (additional) +0.15%

[0049] Water (additional) +4.8%

[0050] Ambient temperature 30~32℃

Embodiment 2

[0052] The raw materials and ratio of the alumina-based self-flowing castable are (the ratio of the raw materials is the mass percentage):

[0053] aggregate:

[0054] White corundum particles 6-3mm 35%

[0055]White corundum particles 3-1mm 5%

[0056] White corundum particles 1-0.5mm 5%

[0057] Tabular alumina particles 0.6-0.2mm 5%

[0058] Tabular alumina particles 0.2-0.045mm 10%

[0059] Matrix:

[0060] White corundum fine powder 45-20um 3%

[0061] Tabular corundum fine powder 20-5um 13%

[0062] а-Al 2 o 3 Micropowder 5-0.1um 18%

[0063] CA-70 cement 6%

[0064] Lignosulfonate (additional) +0.35%

[0065] Water (additional) +5.2%

Embodiment 3

[0067] The raw materials and ratio of the alumina-based self-flowing castable are (the ratio of the raw materials is the mass percentage):

[0068] aggregate:

[0069] 88 super bauxite particles 6-3mm 20%

[0070] 88 super bauxite particles 3-1mm 15%

[0071] High alumina corundum particles 1-0.5mm 7%

[0072] High alumina corundum particles 0.6-0.2mm 10%

[0073] High alumina corundum particles 0.2-0.045mm 7%

[0074] Matrix:

[0075] 88 super bauxite fine powder 45-20um 6%

[0076] Tabular alumina fine powder 20-5um 17%

[0077] а-Al 2 o 3 Micropowder 5-0.1um 14%

[0078] CA-80 cement 4%

[0079] Sodium citrate (extra) +0.20%

[0080] Water (additional) +5.4%

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Abstract

The invention provides a high-density high-strength alumina self-flow castable. The alumina self-flow castable with good fluidity, high density, high strength and high refractoriness is prepared from alumina raw material, alpha-Al2O3 micro powder, aluminate cement and other external additives by reasonably mixing the raw materials with different size fractions according to the theory of granularity, especially by optimizing the size fraction proportion and addition amounts of medium and small particles (less than or equal to 3mm) and substrate fine powder.

Description

technical field [0001] The invention relates to a dense high-strength alumina self-flowing castable. Background technique [0002] Self-flowing castable is a relatively simple molding method among monolithic refractory castables. Because of its low noise on site, simple construction and strong operability, it is widely used in various thermal kilns and other smelting equipment, especially It is applied to those high-temperature areas with complex structures and difficult other construction methods on the equipment. However, in the past self-flowing castable system, in addition to improper selection of materials, inappropriate selection and addition of water reducing agent, the most important reason is that the distribution of particle size distribution is unreasonable, resulting in poor fluidity or no self-flowing castable. In order to improve fluidity, the amount of water added is only one-sidedly increased. The result is that the castable has high porosity and low strengt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/10
Inventor 冯海霞柳军韦祎
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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