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Preparation method of large-size machinable fire-resistant heat-insulating plate

A large-size, plate-based technology, applied in the field of preparation of large-size machinable refractory and heat-insulating plates, can solve the problems of rapid heating and cooling of equipment, large heat storage of refractory lining, and low strength of fiber products, etc., to achieve convenient construction, Good thermal shock resistance and excellent processability

Pending Publication Date: 2021-04-27
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lining of traditional kilns and thermal equipment is generally divided into insulation layer and fire-facing surface. This combination not only has the disadvantages of complex construction and requires professional construction, but also has a large overall heat storage capacity of the refractory lining, which cannot meet the requirements of rapid heating and cooling of equipment, and has poor thermal shock resistance.
In addition, some equipment uses fiberboard as the fire-facing surface. Although there are no problems in heat storage and thermal shock resistance, the strength of fiber products is low. Especially problematic when preparing high-quality materials

Method used

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  • Preparation method of large-size machinable fire-resistant heat-insulating plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Quartz micropowder, xonotlite whiskers, and chopped mullite crystal fibers are configured into a ceramic mixed powder according to the mass fraction of 45:30:25; the ceramic mixed powder and water are mixed evenly according to the mass fraction of 30:70 Prepare mud; add retention and drainage aids to the mud according to the polyacrylamide:ceramic mixed powder mass fraction of 0.2:1000, and stir evenly. Inject mud into the mold cavity, pressurize slowly to remove moisture, and finally hold the pressure to form. After the mold is released, it is dried in sections at 80°C for 10h; 120°C for 10h; 180°C; 8h. The dried plate is sent into the heat treatment furnace: 300°C, 3h; 300°C, 1h; 700°C, 2h; 900°C, 5h; 900°C, 2h. After heat treatment, the board is polished and trimmed to get the finished product.

Embodiment 2

[0023] Quartz micropowder, xonotlite whiskers, and chopped high-alumina fibers are formulated into a ceramic mixed powder according to the mass fraction of 45:25:30; the ceramic mixed powder and water are uniformly mixed according to the mass fraction of 25:70 to prepare Slurry: According to polyacrylamide:ceramic mixed powder mass fraction 0.5:1000, add retention and drainage aids into the slurry and stir evenly. Inject mud into the mold cavity, pressurize slowly to remove moisture, and finally hold the pressure to form. After the mold is released, the drying is completed in sections at 80°C for 16h; 120°C for 16h; 180°C; 10h. The dried plate is sent into the heat treatment furnace: 300°C, 5h; 300°C, 3h; 700°C, 3h; 900°C, 7h; 900°C, 3h. After heat treatment, the board is polished and trimmed to get the finished product.

Embodiment 3

[0025] Quartz micropowder, xonotlite whiskers, and chopped high-silica fibers are formulated into a ceramic mixed powder according to the mass fraction of 75:10:15; the ceramic mixed powder and water are mixed uniformly according to the mass fraction of 26:70. into mud; according to the polyacrylamide:ceramic mixed powder mass fraction 1:1000, add retention and drainage aids into the mud and stir evenly. Inject mud into the mold cavity, pressurize slowly to remove moisture, and finally hold the pressure to form. After the mold is released, it is dried in sections at 80°C for 12h; 120°C for 12h; 180°C; 9h. The dried plate is sent into the heat treatment furnace: 300°C, 4h; 300°C, 2h; 700°C, 2.5h; 900°C, 6h; 900°C, 2.5h. After heat treatment, the board is polished and trimmed to get the finished product.

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Abstract

The invention relates to a preparation method of a large-size machinable fire-resistant heat-insulating plate. According to the preparation method of the large-size machinable fire-resistant heat-insulating plate, the fire-resistant plate is prepared by taking silicon oxide as a main material, adding xonotlite whiskers or wollastonite mineral fibers with good compatibility with a main base material, and adding chopped ceramic fibers in an auxiliary mode for reinforcement and toughening. The plate not only has high strength and good thermal shock resistance of a quartz plate, but also has thermal insulation and machinability of a ceramic fiber product; the board has wood-like texture, and the machining precision is far superior to that of the fiber product; in addition, the plate is formed through wet filter pressing, and the large-size plate with the length being 2 m and the width being about 1 m can be obtained; and due to the fact that the size of the plate is large, when the plate serves as the counter-fire face of thermal equipment, attractiveness is achieved, chippings do not fall off, use and installation are more convenient and efficient, professionals are not needed, and rapid replacement can be achieved.

Description

technical field [0001] The invention relates to a special refractory material for kiln, thermal equipment and light metal casting, in particular to a preparation method of a large-size machinable refractory and heat-insulating plate. [0002] technical background [0003] With the advancement of material preparation technology, kilns and thermal equipment are increasingly valued as common equipment for material annealing, hot pressing and heat treatment. The refractory linings of kilns and thermal equipment are clean and pollution-free, and can be replaced quickly. Require. The lining of traditional kilns and thermal equipment is generally divided into insulation layer and fire-facing surface. This combination not only has the disadvantages of complex construction and requires professional construction, but also has a large overall heat storage capacity of the refractory lining, which cannot meet the requirements of rapid heating and cooling of equipment, and has poor therma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D1/10
CPCF27D1/10
Inventor 王冬冬余同暑王自强
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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