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Quick-hardening and high-strength refractory castable

A technology of refractory castables and castables, applied in the field of refractory materials, can solve the problems of castables that cannot meet the needs, low compressive strength, and slow hardening speed, and achieve shortened hardening time, high impact strength, and increased hardening speed Effect

Active Publication Date: 2014-08-27
XINHUA COUNTY MINGFENG REFRACTORY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing castables harden slowly and have relatively low compressive strength
[0004] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: for industrial kilns that require rapid hardening and high strength requirements, the existing castables cannot meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment provides a rapid-hardening high-strength refractory castable, which is a mixture comprising the following components and weight ratios:

[0046] al 2 o 3 50~85wt%,

[0047] SiO 2 5~15wt%,

[0048] CaO 5~15wt%,

[0049] Cement 2~12wt%,

[0050] Additive 2~12wt%,

[0051] The additive is one or more of silicon micropowder, silicon carbide and sodium hexametaphosphate.

[0052] The main component of the castable is Al 2 o 3 , SiO 2 And CaO, etc., these main components have good compatibility, and the materials are commonly used materials, and the source is stable. Adding additives such as silicon micropowder, silicon carbide and sodium hexametaphosphate to the castable makes the castable have better fire resistance, acid and alkali resistance, and higher strength. Among them, the addition of silicon micropowder significantly improves the compressive resistance, flexural resistance, impermeability and anti-corrosion ...

Embodiment 2

[0059] This embodiment provides a fast-hardening high-strength refractory castable. The castable is based on the first component of the embodiment. It is determined that the additive used is a mixture of silicon micropowder, silicon carbide and sodium hexametaphosphate. Each of the additives in the additive The weight ratio of points is:

[0060] Silica powder 60~80wt%,

[0061] Silicon carbide 10~30wt%,

[0062] Sodium hexametaphosphate 10~30wt%.

[0063] Since the other components of the casting material in this embodiment and the weight ratios of each component are the same as those in Embodiment 1, they will not be repeated here.

Embodiment 3

[0065] This embodiment provides a fast-hardening high-strength refractory castable, the components of the castable and the weight ratio of each component are:

[0066] Al 2 o 3 60~70wt%,

[0067] SiO 2 8~12wt%,

[0068] CaO 8~12wt%,

[0069] Cement 5~10wt%,

[0070] Additive 5~10wt%,

[0071] The additive is a mixture of silicon micropowder, silicon carbide and sodium hexametaphosphate, and the weight ratio of each component in the additive is:

[0072] Silica powder 65~75wt%,

[0073] Silicon carbide 15~20wt%,

[0074] Sodium hexametaphosphate 15-20wt%.

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Abstract

The invention discloses a quick-hardening and high-strength refractory castable. The refractory castable is a mixture comprising the following components by weight percent: 50wt%-85wt% of Al2O3, 5wt%-15wt% of SiO2, 5wt%-15wt% of CaO, 2wt%-12wt% of cement and 2wt%-12wt% of additive, wherein the additive is mixture of silica powder, silicon carbide and sodium hexametaphosphate. As multiple components of the castable are optimally proportioned, the hardening speed of the castable is greatly improved, namely, the hardening time is shortened when in use, thus the castable disclosed by the invention can meet the demands of an industrial stove or thermal equipment which is difficult to construct, short in construction period and requires for form removal as soon as possible.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a fast-hardening and high-strength refractory castable. Background technique [0002] Refractory castables are granular or powdery materials made of refractory and high temperature resistant materials, which can be used after adding a certain amount of binder and water. It is the main variety of unshaped refractory materials, mainly used in cement production kilns, metallurgical industrial kilns, petroleum industrial kilns, chemical industrial kilns, construction, machinery and other kilns and thermal equipment fields. [0003] Existing castables are generally composed of refractory aggregates, powders, binders, admixtures, and solvents. The raw materials for refractory aggregates are generally magnesia, stone dome, perlite, and spinel. Refractory castables are poured, vibrated or tamped into shape, and can be hardened without heating. They are widely used for their...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 龚波郅应周谢克凡
Owner XINHUA COUNTY MINGFENG REFRACTORY MATERIAL CO LTD
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