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Castable for gun patching of blast furnace lining and preparation method for castable

A castable and lining technology, which is applied in the field of refractory materials, can solve the problems of insufficient blast furnace lining repair technology, high strength and durability, unstable construction performance of castables, etc., and achieve excellent slag resistance, stickiness Good performance and fast construction

Inactive Publication Date: 2017-10-03
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] At present, the development of blast furnace lining repair technology is still not perfect, and there is still a lot of research and development space for the development of castables. Durability, etc. are not outstanding yet

Method used

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  • Castable for gun patching of blast furnace lining and preparation method for castable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]The castable is made of 10wt% alumina particles, 50wt% brown corundum particles, 15wt% silicon carbide fine powder, 15wt% corundum fine powder, 0.5wt% metal silicon powder, 0.5% spherical asphalt, 7wt% α-Al 2 o 3 Micropowder and 2wt% silicon oxide micropowder are raw materials, and 8wt% silica sol is added as a binder.

Embodiment 2

[0041] The castable is made of 15wt% alumina particles, 40wt% brown corundum particles, 10wt% silicon carbide fine powder, 25wt% corundum fine powder, 2wt% metal silicon powder, 2% spherical pitch, 4wt% α -Al 2 o 3 Micropowder and 2wt% silicon oxide micropowder are raw materials, and 10wt% silica sol of the raw material is added as a binder.

Embodiment 3

[0043] The castable is made of 12wt% alumina particles, 45wt% brown corundum particles, 15wt% silicon carbide fine powder, 25wt% corundum fine powder, 2wt% metal silicon powder, 2% spherical pitch, 7wt% α -Al 2 o 3 Micropowder and 2wt% silicon oxide micropowder are raw materials, and 15wt% silica sol as the raw material is added as a binder.

[0044] The main properties of the castables of Example 1, Example 2 and Example 3 are shown in the following table:

[0045]

[0046] It can be seen from the above table that this castable has good high temperature volume stability, mechanical properties and slag resistance, and can be well combined with the blast furnace lining without peeling off, and the introduction of SiC can improve the thermal shock stability of the material The use of silica sol enables the material not only to obtain good bonding strength, but also to achieve rapid drying after spraying, and to improve the service life of the gunning lining and ensure the s...

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Abstract

The invention discloses castable for gun patching of a blast furnace lining and a preparation method for the castable. The castable is prepared from raw materials, i.e., 10wt% to 15wt% of bauxite particles, 40wt% to 50wt% of brown fused alumina particles, 10wt% to 20wt% of silicon carbide fine powder, 15wt% to 25wt% of corundum fine powder, 0.5wt% to 2wt% of metal silicon powder, 0.5wt% to 2wt% of pelleted pitch, 2wt% to 7wt% of alpha-Al2O3 micropowder and 0.2wt% to 2wt% of silica micropowder, and silica sol, of which the weight percentage is 8% to 15% that of the raw materials, wherein the silica sol serves as a binder. The method comprises the steps of proportionally preparing the raw materials, adding the raw materials in a stirrer, carrying out uniform stirring and mixing, and then, adding the silica sol as a gun patching wetting medium and the binder, thereby obtaining the castable for gun patching of the blast furnace lining. The castable is superior in slag resistance, high in strength, good in bonding performance and quick in construction and can be integrated with a patched face of the blast furnace lining through binding; and the preparation method is simple in operation, exposed furnace wall linings can be subjected to gun-patching lining forming under the circumstances that a stock level of a blast furnace is lowered, and the blast furnace lining is rapidly patched in a large area.

Description

technical field [0001] The invention relates to a refractory material, in particular to a pouring material for blast furnace inner lining gunning repair and a preparation method thereof. Background technique [0002] The blast furnace lining plays an important role in ensuring the normal production and service life of the blast furnace. After a blast furnace has been used for a period of time, due to thermal shock, erosion, wear and oxidative peeling in the furnace, the refractory layer of the blast furnace lining will be thinned. The redness of the furnace shell occurs, which affects the normal production of the blast furnace. In order to maintain the normal production and long life of the blast furnace and reduce the operating cost of the blast furnace, repairing the severely corroded parts of the blast furnace lining in time is an effective means to prolong the life of the blast furnace. [0003] At present, blast furnace lining gunning is generally carried out by wet in...

Claims

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Application Information

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IPC IPC(8): C04B35/101C04B35/63C04B35/634
CPCC04B35/101C04B35/6316C04B35/63496C04B2235/3418C04B2235/3826C04B2235/428C04B2235/5427C04B2235/5436
Inventor 王立辉唐建春崔秀君万强朱红海
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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