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Gunning refractory for heating furnace

A technology of heating furnace and gunning material, which is applied in the field of non-metallic refractory materials, can solve the problems of poor bonding strength and poor adhesion performance, and achieve the effect of improving bonding strength, high adhesion performance, and good adhesion performance

Inactive Publication Date: 2013-02-20
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This gunning material is suitable for converters, and its adhesion performance is poor when used in heating furnaces, and its bonding strength with the repaired working surface is poor

Method used

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  • Gunning refractory for heating furnace
  • Gunning refractory for heating furnace
  • Gunning refractory for heating furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] According to the formula shown in Table 1, the various raw materials were mixed to obtain the gunning material for the heating furnace.

[0075] Table 1 Example 1 provides the gunning material formula for heating furnace

[0076]

[0077] Use the above-mentioned gunning material to repair the damaged parts of the feed port, the discharge port, the end of the fixed beam and the end of the movable beam of the medium-sized steel heating furnace. The specific operation is as follows: add the gunning material into the high-pressure spray tank, Connect the air source and water source, and spray under the condition that the air pressure is greater than 0.5MPa. The amount of water is 7wt% of the amount of gunning material. After spraying, it is sintered for 2 hours. The gunning material is firmly attached to the repaired working surface to form a gunning surface. The average thickness of the gunning surface is up to 50mm, and the repaired heating furnace is used for steel ro...

Embodiment 2

[0080] According to the formula shown in Table 2, the various raw materials were mixed to obtain the gunning material for the heating furnace.

[0081] The gunning material formula for heating furnace provided in Table 2 Example 2

[0082]

[0083] Use the gunning material to repair the roof collapse of the heating furnace. The landslide is 5m long, 0.5m wide, and 20cm thick. The specific operation is as follows: add the gunning material into the high-pressure spray tank, connect the air source and the water source , spraying under the condition of air pressure greater than 0.5MPa, the amount of water used is 7wt% of the amount of gunning material, and sintered for 2 hours after spraying, the gunning material is firmly attached to the collapsed part to form the gunning surface. After 8 months of normal use of the heating furnace, the top of the furnace did not appear to be ignited or damaged or peeled off.

[0084] It can be seen from Example 2 that when the gunning materi...

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Abstract

The invention provides a gunning refractory for a heating furnace, comprising 45-85 wt% of high alumina bauxite, 5-20 wt% of fused magnesia, 2-10 wt% of aluminum-magnesium spinel, 1-5 wt% of kyanite, 5-35 wt% of binding agent, 0.05-0.5 wt% of sodium tripolyphosphate, 0.01-0.2 wt% of sodium polyacrylate and 0.2-3.0 wt% of aluminum powder. When the heating furnace is repaired by using the gunning refractory provided by the invention, hot-state online repairing can be realized with large speed and high efficiency by using spray-repairing equipment like a gunning machine and a spray gun. Shown by the experiment, the gunning refractory obtains better adhesion and higher binding strength with the repaired working face after a 20-cm thick collapsed portion on the top of the heating furnace is repaired by using the gunning refractory provided by the invention; and no sparkling or spalling damage appears while the repaired gunning refractory is used for eight months.

Description

technical field [0001] The invention belongs to the technical field of non-metal refractory materials, and in particular relates to a gunning material for a heating furnace. Background technique [0002] The heating furnace is the key equipment before the billet is hot rolled. During the operation of the heating furnace, the furnace wall, furnace roof, columns, beams and other parts are subjected to the scour of high-temperature air flow and the shock of mechanical operation for a long time, resulting in continuous melting loss, peeling, pitting or thinning, which affects the quality or Reduce the service life of the heating furnace. After melting or peeling occurs, it is necessary to repair the damaged part, that is, replace or repair the refractory material. [0003] The prior art discloses a variety of repair methods for heating furnace refractory materials, such as pouring method, ramming repair method, dry gunning method, flame gunning method, casting repair method, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 管山吉袁鹏举鹿洪利董晓春王兆成孙庆亮李志峰王超王长宝
Owner SHANDONG IRON & STEEL CO LTD
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