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High-strength wear-resistant castable for rotary hearth furnace and preparation method thereof

A technology of castables and rotary hearth furnaces, applied in the field of castables, can solve problems such as damage and lining cracking, and achieve the effects of stress relief, strong thermal shock stability, and excellent thermal shock stability

Active Publication Date: 2022-04-19
PUYANG REFRACTORIES GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The heated iron ore rotates continuously in the rotary hearth furnace, which changes the temperature of the kiln lining material, and alternates cold and heat, resulting in cracking and damage to the lining;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The formula of the high-strength wear-resistant castable for the rotary hearth furnace of the present embodiment is as follows:

[0045] The particle size ratio of the aggregate is:

[0046] 18kg of high alumina bauxite homogenized material with a particle size greater than 3mm and less than or equal to 5mm,

[0047] 16kg of high alumina bauxite homogenized material with a particle size greater than 1mm and less than or equal to 3mm,

[0048] 15kg of high alumina bauxite homogenized material with a particle size greater than 0.088mm and less than or equal to 1mm;

[0049] Kyanite with a particle size greater than 0.088mm and less than or equal to 1mm is 9kg;

[0050] Fine powder is:

[0051] 10kg of brown corundum powder with particle size greater than 0mm and less than or equal to 0.088mm;

[0052] 10kg of mullite powder with particle size greater than 0mm and less than or equal to 0.088mm;

[0053] The mixed powder is:

[0054] SiC fine powder with a particle si...

Embodiment 2

[0067] The formula of the high-strength wear-resistant castable for the strong reducing atmosphere kiln of the present embodiment is as follows:

[0068] The aggregates are brown corundum and mullite, and the brown corundum and mullite each account for 50%; and the particle size ratio of the aggregate is:

[0069] Aggregate with particle size greater than 3mm and less than or equal to 5mm is 18kg,

[0070] Aggregate with particle size greater than 1mm and less than or equal to 3mm is 16kg,

[0071] Aggregate with particle size greater than 0.088mm and less than or equal to 1mm is 20kg;

[0072] 8kg of kyanite with a particle size greater than 0.088mm and less than or equal to 1mm;

[0073] Fine powder is:

[0074] 10kg of brown corundum powder with particle size greater than 0mm and less than or equal to 0.088mm;

[0075] 10kg of mullite powder with particle size greater than 0mm and less than or equal to 0.088mm;

[0076] The mixed powder is:

[0077] SiC fine powder wi...

Embodiment 3

[0090] The formula of the high-strength wear-resistant castable for the strong reducing atmosphere kiln of the present embodiment is as follows:

[0091] The aggregate is white corundum; and the particle size ratio of the aggregate is:

[0092] Aggregate with particle size greater than 3mm and less than or equal to 5mm is 18kg,

[0093] Aggregate with particle size greater than 1mm and less than or equal to 3mm is 16kg,

[0094] Aggregate with particle size greater than 0.088mm and less than or equal to 1mm is 20kg;

[0095] 8kg of kyanite with a particle size greater than 0.088mm and less than or equal to 1mm;

[0096] Fine powder is:

[0097] 11kg of brown corundum powder with particle size greater than 0mm and less than or equal to 0.088mm;

[0098] 8 kg of plate corundum powder with a particle size greater than 0 mm and less than or equal to 0.088 mm;

[0099] The mixed powder is:

[0100] SiC fine powder with a particle size greater than 0mm and less than or equal t...

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Abstract

The invention discloses a high-strength wear-resistant castable for a rotary hearth furnace and a preparation method thereof. It is composed of aggregate, fine powder and mixed powder. The aggregate is high-alumina bauxite homogenized material, brown corundum, white corundum and mullite any one or several of stones; the fine powder is any one or several of brown corundum, white corundum, plate corundum and mullite; the mixed powder is composed of SiC powder, fine powder, binder, and Composition of agents and dispersants. The high-strength wear-resistant castable for kilns with a strong reducing atmosphere such as rotary hearth furnaces for direct reduced iron of the present invention has good CO cracking resistance, low requirements on raw materials, and excellent thermal shock resistance and wear resistance.

Description

technical field [0001] The invention relates to the field of castable technology. In particular, it relates to a high-strength and wear-resistant castable for kilns with strong reducing atmosphere such as rotary hearth furnaces for direct reduction iron and a preparation method thereof. Background technique [0002] my country's resource conditions determine that my country's direct reduced iron (DRI) production will be dominated by coal-based direct reduction for a long time. At present, the direct reduction of the rotary kiln method in the coal-based direct reduction method is being replaced by the more and more mature direct reduction of the rotary hearth furnace. Rotary hearth furnace direct reduction smelting technology has the advantages of simple process, advanced technology, strong adaptability to raw materials, high operation rate and resource recovery rate in making full use of low-grade iron ore and associated ore resources, and treating solid waste resources suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/103C04B35/66
CPCC04B35/103C04B35/66C04B2235/3418C04B2235/3272C04B2235/3463C04B2235/3826C04B2235/3222C04B2235/3225C04B2235/96C04B2235/77
Inventor 王京京王成杨利鹏朱厚亮潘磊孙荣海郑少斐孟小涵
Owner PUYANG REFRACTORIES GRP CO LTD
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