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Semi-dry gunning material and its preparation method and application

A technology of gunning material and semi-dry method, which is applied in the direction of lighting and heating equipment, furnace, lining repair, etc., can solve the problems of high risk of acetylene and oxygen, reduced usage rate, complicated process, etc., to reduce comprehensive maintenance costs, The effect of small influence and low porosity

Active Publication Date: 2021-11-05
HUNAN LILING MALIAN REFRACTORY MUD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Flame gunning can prolong the service time of repairing the coke oven wall, up to half a year to more than a year. However, due to the expensive equipment and materials, and the complicated process, the use of acetylene and oxygen is also relatively dangerous, so it is difficult to promote in China , the utilization rate of units with equipment is also decreasing year by year, or even out of service

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Semi-dry gunning material, in parts by weight, includes components: SiO 2 39.86 parts, Al 2 o 3 50.04 parts, Fe 2 o 3 1.16 parts, binder-hydroxymethyl cellulose 6.2 parts, sintering agent-soft clay 1.5 parts.

[0028] Among them, SiO 2 The particle size is divided into 100-200 mesh and 800-1000 mesh, 100-200 mesh SiO 2 With 800-1000 mesh SiO 2 The weight ratio of Al is 1.2:1; Al 2 o 3 The particle size is 240 mesh, Fe 2 o 3 The particle size is 260 mesh.

[0029] The above-mentioned components are mixed evenly according to the above proportions, and the semi-dry gunning material is obtained.

[0030] According to methods known in the art, the performance test of the semi-dry gunning material of this embodiment is carried out, and its cold flexural strength: 7.8MPa after drying at 110°C×24h, and 6.78MPa after burning at 1110°C×3h; linear change rate : -0.13% after drying at 110℃×24h, and -0.26% after burning at 1110℃×3h.

[0031] Adopting the gunning mater...

Embodiment 2

[0037] Semi-dry gunning material, in parts by weight, includes components: SiO 2 38.5 parts, Al 2 o 3 48.3 parts, Fe 2 o 3 0.9 parts, binder-polyvinyl alcohol 7 parts, sintering agent-soft clay 2 parts.

[0038] Among them, SiO 2 The particle size is divided into 100-200 mesh and 800-1000 mesh, 100-200 mesh SiO 2 With 800-1000 mesh SiO 2 The weight ratio of Al is 1.6:1; Al 2 o 3 The particle size is 200 mesh, Fe 2 o 3 The particle size is 300 mesh.

[0039] The above-mentioned components are mixed evenly according to the above proportions, and the semi-dry gunning material is obtained.

[0040]It was observed that the solidification time after gunning was 66 seconds. Judging from the hanging material after gunning, the wall surface to be gunned is relatively smooth as a whole, without obvious cracks, pockmarks, and no shedding phenomenon. After continuous observation for one year, the overall condition of the repaired wall surface is good, with only small cracks...

Embodiment 3

[0042] Semi-dry gunning material, in parts by weight, includes components: SiO 2 42.8 parts, Al 2 o 3 53.9 parts, Fe 2 o 3 1.2 parts, 8 parts of binder-porous silicon-containing polymer (prepared in Example 1 in CN106279510A), 2 parts of sintering agent-soft clay.

[0043] Among them, SiO 2 The particle size is divided into 100-200 mesh and 800-1000 mesh, 100-200 mesh SiO 2 With 800-1000 mesh SiO 2 The weight ratio of Al is 2:1; Al 2 o 3 The particle size is 200 mesh, Fe 2 o 3 The particle size is 300 mesh.

[0044] The above-mentioned components are mixed evenly according to the above proportions, and the semi-dry gunning material is obtained.

[0045] It was observed that the solidification time after gunning was 62 seconds. Judging from the hanging material after gunning, the wall surface to be gunned is relatively smooth as a whole, without obvious cracks, pockmarks, and no shedding phenomenon. After continuous observation for one year, the overall condition...

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Abstract

The invention discloses a semi-dry gunning material, a preparation method and application thereof. In parts by weight, the gunning material includes components: SiO 2 35‑45 parts, Al 2 o 3 45‑55 parts, Fe 2 o 3 0.5-1.5 parts, 5-10 parts of binder, 1-3 parts of sintering agent. The gunning material can be used to repair the coke oven lining, including the following steps: (1) Before repairing the furnace, remove the adhesive on the wall surface of the coke oven lining that needs to be gunned; (2) The wall to be gunned Spray the gunning material on the surface, while spraying the gunning material, spray water on the wall; (3) After filling the pits on the wall, level the gunning surface in time. The gunning material has high adhesion on the furnace wall, and is suitable for rapid repair of cracks, small caves and deeply eroded walls. The solidification time after gunning is less than 70 seconds, and the rebound rate of the gunning material is small (<15%), which meets the needs of gunning.

Description

technical field [0001] The invention belongs to the field of coke oven maintenance, and in particular relates to a semi-dry gunning material and its preparation method and application. Background technique [0002] Coke oven is an important equipment in coking chemical industry, and its service life is generally more than 20 years. However, due to various factors in the coking production process of the coke oven, the lining of the coke oven will be damaged to varying degrees as time goes by. The damage of the carbonization chamber of the coke oven includes roughening of the surface, often subject to expansion cracks, peeling, bending, etc., especially the door of the coke oven on the coke side of the coke oven - often subject to the temperature fluctuations caused by the coke discharge, which will cause the bricks to crack cracked, broken and peeled off, forming pits, seriously affecting the normal production of coke ovens. [0003] At present, there are three main methods...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/10F27D1/16
CPCC04B35/10C04B35/66C04B2235/3272C04B2235/3418C04B2235/5436C04B2235/96C04B2235/9615F27D1/1642
Inventor 张爱云
Owner HUNAN LILING MALIAN REFRACTORY MUD
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