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A kind of lightweight thermal insulation castable for coke oven coal charging hole cover and its preparation and use method

A coal-charging hole cover and castable technology, which is applied in coking ovens, coking oven heating, coking oven doors/closers, etc., can solve the problems of high thermal conductivity of thermal insulation materials, weak casting matrix bonding, and long service life Low-level problems, to achieve the effect of high strength, good fluidity, and reduce heat loss

Active Publication Date: 2021-12-07
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the new coal charging hole cover still has the disadvantages of high thermal conductivity and low strength of the internal thermal insulation material, weak combination with the casting matrix, and low service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074]Embodiment 1 A kind of lightweight thermal insulation castable for coke oven coal charging hole cover, its raw material formula is shown in Table 1:

[0075] 1) Weigh various raw materials in proportion, mix and stir for 5-8 minutes;

[0076] 2) Add water of 7% to 10% of the total weight of the mixture, and continue to mix and stir for 5 to 8 minutes to prepare a castable.

[0077] The present invention also provides a method for using the above castable, comprising the following steps:

[0078] 1) Inject the castable of the present invention into the fixed energy-saving coal charging hole cover and form it by vibration;

[0079] 2) The energy-saving coal charging hole cover cast in step 1) is naturally cured for 3 days, and then baked at 120°C for 36 hours before it can be used.

[0080] Its main physical and chemical indicators are as follows:

[0081] Refractory temperature (℃) >1500

[0082] Bulk density (g / cm 3 ) 1.0 (120°C×36h); 1.2 (1200°C×24h)

[0083] Comp...

Embodiment 2

[0087] Embodiment 2 A kind of lightweight thermal insulation castable for coke oven coal charging hole cover, its raw material formula is shown in Table 1:

[0088] With this castable preparation and using method with embodiment 1, its main physical and chemical index is as follows:

[0089] Refractory temperature (℃) >1500

[0090] Bulk density (g / cm 3 ) 1.1 (120°C×36h); 1.1 (1200°C×24h)

[0091] Compressive strength (MPa) 41 (120°C×36h); 67 (1200°C×24h)

[0092] Bonding strength (MPa) 17 (120°C×36h); 27 (1200°C×24h)

[0093] Thermal conductivity (W / m·℃) 0.19 (1200℃)

[0094] Thermal shock stability (times) 34 (1200°C water cooling).

Embodiment 3

[0095] Embodiment 3 A kind of lightweight thermal insulation castable for coke oven coal charging hole cover, its raw material formula is shown in Table 1:

[0096] With this castable preparation and using method with embodiment 1, its main physical and chemical index is as follows:

[0097] Refractory temperature (℃) >1500

[0098] Bulk density (g / cm 3 ) 1.0 (120°C×36h); 1.2 (1200°C×24h)

[0099] Compressive strength (MPa) 40 (120°C×36h); 67 (1200°C×24h)

[0100] Bonding strength (MPa) 17 (120°C×36h); 28 (1200°C×24h)

[0101] Thermal conductivity (W / m·℃) 0.21 (1200℃)

[0102] Thermal shock stability (times) 33 (1200°C water cooling).

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Abstract

The invention discloses a light-weight thermal insulation castable for coke oven coal charging hole cover and its preparation and use method. The castable contains the following raw material components in terms of weight percentage: aluminum oxide hollow balls with a particle size of 1-3mm 15 ~30%, calcium hexaaluminate with a particle size of 0~1mm 10~35%, fused silica with a particle size of 0~3mm 10~15%, zirconia with a particle size of 0~1mm 7~20%, a particle size of 0.5~1mm 5-20% of potassium titanate, 5-15% of boron fiber, 1-5% of aluminum dihydrogen phosphate with a particle size of 180-200 mesh, 2-8% of magnesium chloride with a particle size of 0-0.5 mm, and a particle size of 0-200 mm 1mm ferrous oxide 1~3%. The castable can meet the service conditions of the coke oven roof, has the advantages of low thermal conductivity, high strength and bonding strength, and is firmly combined with the casting of the coal charging hole cover, which can greatly reduce the heat loss in the furnace and increase the service life.

Description

technical field [0001] The invention belongs to the field of refractory materials for coke ovens in the iron and steel industry, and in particular relates to a castable for coke oven coal charging hole covers and a preparation and use method thereof. Background technique [0002] Coke oven is a complex large-scale industrial kiln, usually a furnace made of refractory bricks and refractory blocks, a kiln for refining coke with coal, and is the main thermal equipment for coking. The coal charging hole is an important part of the coke oven. It is composed of the coal charging hole cover and the coal charging hole seat brick. When adding coal, the coal charging hole cover is opened, and coal of various specifications enters the coke oven carbonization chamber through the coal charging hole, and then the coal charging is closed. Caps for the production of coke. At present, the coal charging hole covers used in domestic coke ovens are generally made of ordinary cast iron integral...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C10B25/20
CPCC04B35/66C04B2235/3217C04B2235/3222C04B2235/3234C04B2235/3244C04B2235/3272C04B2235/3418C04B2235/444C04B2235/447C04B2235/5216C04B2235/77C04B2235/96C04B2235/9607C10B25/20
Inventor 邹仲平董晓春张宁国郑晓明蔡仲恩衣冠玉刘建营王世豪
Owner SHANDONG JIANZHU UNIV