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A flexible carbon castable for furnace bottom screed

A technology of leveling layer and castable, applied in the field of materials, can solve the problems of unsuitable leveling, low thermal conductivity, impact on the service life of blast furnace, etc., and achieve the effect of easy grinding and leveling, simple construction operation and saving construction period.

Active Publication Date: 2021-07-13
中冶武汉冶金建筑研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most domestic blast furnace leveling layer materials are basically tar or resin-bonded carbon ramming materials, which have problems such as low thermal conductivity, long construction period, serious environmental pollution, low strength, and unsuitable leveling, which have a great impact on the service life of blast furnaces.

Method used

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  • A flexible carbon castable for furnace bottom screed
  • A flexible carbon castable for furnace bottom screed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 63.5% of high-power graphite granular material, 13% of high-power graphite powder, 4% of natural flake graphite, 15% of pure aluminate cement, 3% of active α-alumina micropowder, and 1.5% of dispersant into the mixer by mass percentage Stir evenly, add an appropriate amount of water and stir to form a pourable state, then place it in a mold for vibration molding, and demould after the sample is hardened.

[0025] After demoulding, put the test piece in an oven at 110°C to dry for 24 hours, then take it out to test its thermal conductivity.

[0026] Make a mold with a steel plate, the specific size is that the bottom plate is a square with a side length of 1m, the side wall size is a side length of 1m, and a height of 0.1m. After the production is completed, the top surface of the mold side wall is washed and polished, and the horizontal accuracy reaches ≤1.6um.

[0027] Weigh 200kg of powder according to the ratio of this example, add an appropriate amount of water...

Embodiment 2

[0030] Put 65% of high-power graphite granules, 13% of high-power graphite powder, 3% of natural flake graphite, 13% of pure aluminate cement, 4% of active α-alumina micropowder, and 2% of dispersant into the mixer and stir evenly, adding Stir an appropriate amount of water into a pourable state, place it in a mold for vibration molding, and release the mold after the sample hardens.

[0031] After demoulding, put the test piece in an oven at 110°C to dry for 24 hours, then take it out to test its thermal conductivity.

[0032] Make a mold with a steel plate, the specific size is that the bottom plate is a square with a side length of 1m, the side wall size is a side length of 1m, and a height of 0.1m. After the production is completed, the top surface of the mold side wall is washed and polished, and the horizontal accuracy reaches ≤1.6um.

[0033] Weigh 200kg of powder according to the material ratio of this example, add an appropriate amount of water and stir evenly, pour ...

Embodiment 3

[0036] Put 62% of high-power graphite granules, 17% of high-power graphite powder, 4% of natural flake graphite, 12% of pure aluminate cement, 3% of active α-alumina micropowder, and 2% of dispersant into a mixer and stir evenly, adding Stir an appropriate amount of water into a pourable state, place it in a mold for vibration molding, and release the mold after the sample hardens.

[0037] After demoulding, put the test piece in an oven at 110°C to dry for 24 hours, then take it out to test its thermal conductivity.

[0038] Make a mold with a steel plate, the specific size is that the bottom plate is a square with a side length of 1m, the side wall size is a side length of 1m, and a height of 0.1m. After the production is completed, the top surface of the mold side wall is washed and polished, and the horizontal accuracy reaches ≤1.6um.

[0039] Weigh 200kg of powder according to the material ratio of this example, add an appropriate amount of water and stir evenly, pour th...

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Abstract

The invention discloses a flexible carbon castable for furnace bottom leveling layer, the composition of which is as follows in terms of mass percentage: 61-65% of high-power graphite granules; 10-20% of high-power graphite powder; active α-oxidation Aluminum powder 3-5%; natural flake graphite 2-5%; pure aluminate cement 7-14%; dispersant 1-2%. The invention is energy-saving and environment-friendly, does not produce substances harmful to the environment, does not cause any harm to construction workers, meets the requirements of the state for environmental protection and energy-saving emission reduction, and has greater advantages compared with the prior art in terms of environmental protection. The construction operation of the materials used is simple and has certain thixotropy. It only needs to be repaired in time and quickly after vibration forming, which can save a lot of construction time.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a flexible carbon castable for furnace bottom leveling layer. Background technique [0002] Modern blast furnaces are gradually developing towards large and medium-sized ones. The country is constantly controlling the elimination of outdated steel production capacity. The number of newly built blast furnaces of 2,000 to 5,800 cubic meters is increasing. The increase in furnace capacity puts forward higher requirements for the smelting intensity of blast furnaces. At the same time, higher requirements are put forward for the refractory materials of the furnace bottom and hearth, and corresponding technical improvements must be made to achieve the longevity of the blast furnace under the new situation. [0003] The leveling layer of the blast furnace bottom includes the area under the furnace bottom sealing plate and the area above the furnace bottom sealing plate and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3217C04B2235/425C04B2235/5427C04B2235/5436C04B2235/9607
Inventor 刘会永丛培源项冰毛雪松彭云涛侯玮玮薛海涛
Owner 中冶武汉冶金建筑研究院有限公司
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