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Method for producing waterless taphole mix for blast furnace from high-alumina waste refractory materials

A technology of waste refractory materials and anhydrous taphole mud, which is applied in the field of blast furnace anhydrous taphole mud, which can solve the problems of inability to ensure the smooth operation of the blast furnace, leakage of molten iron from the melting of blast furnace mud, and reduce the cost of blast furnace mud, so as to achieve excellent slag resistance, Emission reduction and low cost effects

Inactive Publication Date: 2013-01-16
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two solutions only partially replace the corundum raw material and clay, which can only partially reduce the cost of the clay, and at the same time uncontrollably introduce alkaline impurities such as calcium oxide, sodium oxide, potassium oxide, and magnesium oxide, which are easy to mix with the clay when used. Alumina, silicon oxide and other components react to form low-melting substances, which will cause accidents such as molten iron leakage and other accidents. There are potential hazards to the use of blast furnaces, especially large-scale blast furnaces, and the stability of blast furnaces cannot be guaranteed.

Method used

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  • Method for producing waterless taphole mix for blast furnace from high-alumina waste refractory materials
  • Method for producing waterless taphole mix for blast furnace from high-alumina waste refractory materials
  • Method for producing waterless taphole mix for blast furnace from high-alumina waste refractory materials

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Experimental program
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Effect test

Embodiment 1

[0032] The waste refractories used are used blast furnace iron channel materials, which are processed into granules and fine powders. The mass ratio content of used blast furnace iron channel materials is 70.32% for alumina, 14.47% for silicon carbide and 2.85% for carbon. . It completely replaces the brown corundum and Youte bauxite raw materials in the original gun mud. Because it contains silicon carbide and carbon, it partially replaces silicon carbide and coke powder. The mass percentage ratio of each component is as follows:

[0033]

[0034] After accurately weighing various ingredients, add a special wet mill with heating function for gun mud and mix for 5 minutes until all raw materials are evenly distributed. First, add a binder with a mass ratio of 80%, and mill the mud within the range of 70°C. 20 minutes, then add the remaining binder with a mass ratio of 20%, and continue to grind the mud for 15 minutes to discharge; after discharging, put it into a high-press...

Embodiment 2

[0039] The waste refractory material used is the used ladle slide, which is processed into granules and fine powder. The used ladle slide has a mass ratio of alumina of 65.27% and a carbon content of 6.85%. Most of it replaces brown corundum, and part of it replaces coke powder. The mass percentage ratio of each component is as follows:

[0040]

[0041] After accurately weighing various ingredients, add a special wet mill with heating function for gun mud and mix for 7 minutes until all raw materials are evenly distributed. First, add a binder with a mass ratio of 85%, and mill the mud within the range of 70 ° C. 20 minutes, then add the remaining binder with a mass ratio of 20%, and continue to grind the mud for 15 minutes to discharge; after discharging, put it into a high-pressure extruder to form a cylinder with a diameter of 180mm and a length of 200mm, and seal it with a plastic bag. Put it in a special box or a big bag for clay.

[0042] The physical and chemical tec...

Embodiment 3

[0046] The waste refractory material used is a combination of used ladle seat bricks and used ladle breathable bricks. The used ladle seat bricks have an alumina mass ratio of 88.38%, and the used ladle breathable bricks have an alumina mass ratio of 90.67%. The two are processed into granules and fine powder, all of which replace the raw materials of brown corundum and Youte bauxite in the gun clay, and the mass percentage ratio of each component is as follows:

[0047]

[0048] The added binder is a composite binder, accounting for 12% of the total mass of the ingredients. The composite binder is used after mixing thoroughly with anthracene oil and phenolic resin in a ratio of 4:1.

[0049] After accurately weighing various ingredients, add them to a special wet mill with heating function for gun mud and mix for 6 minutes until all raw materials are evenly distributed. First, add a binder with a mass ratio of 80%, and mill the mud at 60 ° C. The mud milling time is 20 Min...

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Abstract

The invention discloses a method for producing a waterless taphole mix for a blast furnace from high-alumina waste refractory materials. The produced low-cost waterless taphole mix can satisfy the operating requirements for plugging tapholes of large and medium blast furnaces. The method comprises the selection of raw materials for production, the processing of the raw materials for production, the proportioning of the raw materials for production, and the production process. The waterless taphole mix produced by the method has the characteristics of low cost, good plasticity and sintering property, high middle-and-high-temperature strength, favorable slag and iron erosion resistance and the like, and can completely satisfy the operating requirements of large and medium blast furnaces. Compared with the existing waterless taphole mix, the cost can be reduced by 40-60%; since a great amount of waste refractory materials are used, the emission of the solid waste can be decreased, and a great amount of high-quality refractory materials such as brown corundum, premium / extra grade alumina and the like can be saved; and meanwhile, the energy consumption and the emission of carbon dioxide gas during the smelting of brown corundum and premium / extra grade alumina can be decreased.

Description

technical field [0001] The invention relates to a method for producing anhydrous taphole mud for blast furnace plugging. In particular, it is a method for producing anhydrous blast furnace clay from waste refractory materials containing high alumina. Background technique [0002] Tappet clay is an unshaped refractory material that must be used in the blast furnace plugging. According to the type of binder, it is divided into water taphole clay and anhydrous taphole clay. Water tapped mud can only be applied to 450m 3 About 500,000 small blast furnaces, and more than 90% of blast furnaces use anhydrous taphole mud, with an annual consumption of about 500,000 tons. Anhydrous taphole clay has the advantages of high temperature strength, erosion resistance, not easy to expand holes, and not easy to wet iron mouth. The raw materials used in the production of anhydrous taphole clay by different manufacturers are different, mainly brown corundum, bauxite, mullite, silicon carbid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66B09B3/00
Inventor 李志坚魏金士吴锋李心慰徐娜
Owner UNIV OF SCI & TECH LIAONING
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