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Double-layer composite refractory material, double-layer composite refractory material ditch cover, manufacture method for ditch cover, and application of material

A refractory, double-layer composite technology, applied in the field of metallurgy, can solve the problems of easy falling off, high strength and rigidity, easy to be subjected to strong impact, etc., and achieves good thermal insulation effect, good thermal shock resistance, and pollution reduction effects.

Active Publication Date: 2015-04-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The iron gutter should be cleaned frequently, and the ditch cover or cover plate is easily deformed and subjected to strong impact during frequent lifting
The overall structure of the internal refractory bricks is not good, and it is easy to fall off when impacted, and the bricks are easy to fall off; the high-density cast refractory material has a large weight, strength and rigidity, and the thermal expansion coefficient of the refractory brick and cast refractory material does not match the steel structure frame. It is easy to crack and fall off during use, which greatly shortens the service life of the trench cover
At present, the service life of trench covers and cover plates in domestic ironworks is generally about half a year, which seriously affects the work, environment and safety of ironworks. Frequent replacement of trench covers and cover plates also increases ironmaking costs
In order to solve the above problems, the patent CN202164312U proposes a method of using refractory fiber directly as the inner lining of the trench cover, but it is difficult to fix it with the steel structure frame

Method used

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  • Double-layer composite refractory material, double-layer composite refractory material ditch cover, manufacture method for ditch cover, and application of material
  • Double-layer composite refractory material, double-layer composite refractory material ditch cover, manufacture method for ditch cover, and application of material

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Embodiment 1

[0023] Such as figure 1 As shown, it is a double-layer composite refractory ditch cover for an iron gutter of an ironmaking blast furnace provided by an embodiment of the present invention. The trench cover includes a steel structure shell 1 , a main refractory material layer 3 filled in the steel structure shell 1 , and an anti-hot metal scour layer 4 arranged on the inner and outer surfaces of the steel structure shell 1 . A plurality of umbrella-shaped reinforcing ribs 2 are also connected to the outer inner surface of the steel structure shell 1 . The thickness of the main refractory material layer 3 is 10-15 cm, and the thickness of the anti-flushing layer 4 is 2-5 mm. The cross section of the ditch cover is trapezoidal, and the sample size is 5.5m long*(bottom width 2m, top width 1.5m)*high 1.3m.

[0024] In this embodiment, the composition of the main refractory material layer 3 is (in parts by weight): 1 part of ceramsite, 0.67 part of floating beads, 0.05 part of pe...

Embodiment 2

[0029] Such as figure 2 As shown, it is a double-layer composite refractory ditch cover for an iron gutter of an ironmaking blast furnace provided by an embodiment of the present invention. The cross-section of the double-layer composite refractory trench cover is arc-shaped, and the size is 5.5m*(bottom width: 2m, arc top radius: 1m)*height: 1.3m.

[0030] In this embodiment, the composition of the main refractory material layer 3 is (by weight): 1.5 parts of ceramsite, 1 part of floating beads, 0.1 part of perlite, 1.5 parts of calcium aluminate cement (CA-50), 0.05 parts of steel fiber, 0.55 parts of water, 0.012 parts of water reducing agent. Pour the lightweight refractory castable into the concrete mixer, add water and mix evenly until the castable just segregates.

[0031] In the present embodiment, the composition of the anti-hot metal scour layer 4 is (in parts by weight): 20 parts of concentrated phosphoric acid, 8 to 8.5 parts of water, Al(OH) 3 5 parts of fine ...

Embodiment 3

[0035] An embodiment of the present invention provides a double-layer composite refractory ditch cover for an iron ditch of an iron-making blast furnace. The cross-section of the ditch cover is rectangular, and the size is 5.5m long * 2m wide at the bottom * 0.15m high.

[0036] In this embodiment, the composition of the light and high-strength main body layer is (in parts by weight): 1 part of ceramsite, 0.67 part of floating beads, 0.05 part of perlite, 1.2 parts of calcium aluminate cement (CA-50), 0.02 part of steel fiber, water 0.38 parts, 0.01 parts of water reducing agent. Pour the lightweight refractory castable into the concrete mixer, add water and mix evenly until the castable just segregates.

[0037]In this embodiment, the composition of the wear-resistant and anti-scouring surface layer is (in parts by weight): 20 parts of phosphoric acid, 8 to 8.5 parts of water, Al(OH) 3 5 parts of fine powder, 0.35 parts of aluminum silicate fiber, α-Al 2 o 3 22 parts of fi...

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Abstract

The invention provides a double-layer composite refractory material, a double-layer composite refractory material ditch cover, a manufacture method for the ditch cover, and application of the material. The ditch cover comprises a steel structural housing, a main refractory material packed in the steel structural housing, and a molten-iron-flushing-resistant layer arranged on the outer surface at the inner side of the steel structural housing; the main refractory material is formed by mixing a first filler, steel fiber, cement, a water reducer and water for forming a slurry and pouring the slurry, and the first filler is composed of ceramsite, a floating bead and perlite; and the molten-iron-flushing-resistant layer is formed by mixing a second filler, Al(OH)3 micro powder, concentrated phosphoric acid and water and solidifying, and the second filler is composed of aluminium silicate fiber, alpha-Al2O3 micro powder and graphite micro powder. The prepared double-layer composite refractory material ditch cover has the characteristics that the ditch cover is poured for molding, is capable of effectively preventing molten iron and flue dust from damaging workers, is capable of reducing environmental pollution caused by exhaust gas, is light in weight, large in strength, long in service life, resistant to high temperature, good in thermal shock resistance, free of deformation, free of cracking, free of shedding, good in thermal insulation, and free of damage when being shifted, suspended or shaken.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a double-layer composite refractory material and a double-layer composite refractory trench cover and its manufacturing method and application. The trench cover is suitable for iron-making and steel-making blast furnace ditch cover or as a slag trench cover It is suitable for use as a dust collection cover, and is suitable for high-temperature liquid metal discharge ditch covers in other pyrometallurgy (such as copper smelting, lead smelting, etc.) fields or as a dust collection cover and slag ditch cover. Background technique [0002] Tapping of blast furnaces in ironworks will produce a lot of smoke, and tapholes, iron trenches, etc. need trench covers and cover plates to prevent dust. At present, domestic and foreign iron-making blast furnace iron ditch covers or cover plates generally adopt steel structure frames, with refractory bricks or refractory castables with large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C21B7/14C22B5/02
Inventor 雷家珩熊鑫郭丽萍杜小弟汪海林
Owner WUHAN UNIV OF TECH
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