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A lightweight castable for sintering ignition furnace

A lightweight, castable technology, applied in the field of refractory materials, can solve the problems of poor thermal insulation performance, high energy consumption, high temperature performance such as strength, poor thermal shock stability, etc., to achieve close thermal insulation performance, reduce thermal conductivity, reduce The effect of low self-weight

Active Publication Date: 2020-01-31
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, provide a lightweight castable for sintering ignition furnaces, and effectively solve the problems of poor thermal insulation performance and high energy consumption in heavy castables currently used for sintering ignition furnaces , and the problems of poor high-temperature performance such as strength and thermal shock stability existing in existing lightweight castables

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A lightweight castable for sintering ignition furnace, the specific preparation steps are as follows:

[0030] 1) The raw materials are weighed, and the mass percentage of each raw material is: 20% of bauxite aggregate with a particle size of 8 to 5 mm;

[0031] 5% of bauxite aggregate with particle size of 5-3mm; 5% of bauxite aggregate with particle size of 3-1mm; 5% of bauxite aggregate with particle size of less than 1mm; 15% of bauxite powder with particle size of less than 0.074mm; 5~3mm light weight aggregate (porous mullite) 15%; particle size 3~1mm light weight aggregate (porous mullite) 10%; particle size less than 1mm light weight aggregate (porous mullite) 5%; microsilica powder with particle size less than 0.074mm 7%; kyanite powder with particle size less than 0.074mm 8%; calcium aluminate cement 5%; The total mass of 0.05% of the polycarboxylic acid-based superplasticizer.

[0032] 2) The weighed raw materials are placed in a mixer and mixed evenly, the...

Embodiment 2

[0035] A lightweight castable for sintering ignition furnace, the specific preparation steps are as follows:

[0036] 1) The raw materials are weighed, and the mass percentage of each raw material is: 20% of bauxite aggregate with a particle size of 8 to 5 mm;

[0037] 8% of bauxite aggregates with a particle size of 5-3mm; 7% of bauxite aggregates with a particle size of 3-1mm; 5% of bauxite aggregates with a particle size of less than 1mm; 15% of bauxite powder with a particle size of less than 0.074mm; 5~3mm lightweight aggregate (porous mullite) 12%; particle size 3~1mm lightweight aggregate (porous mullite) 8%; particle size less than 1mm lightweight aggregate (porous mullite) 5%; silicon micropowder with particle size less than 0.074mm 5%; aluminum micropowder with particle size less than 0.074mm 2%; kyanite powder with particle size less than 0.074mm 8%; high alumina cement 5%; plus 0.01% of the total mass of each component Sodium tripolyphosphate and 0.05% of the tota...

Embodiment 3

[0041] A lightweight castable for sintering ignition furnace, the specific preparation steps are as follows:

[0042] 1) The raw materials are weighed, and the mass percentage of each raw material is: 20% of bauxite aggregate with a particle size of 8 to 5 mm;

[0043] 8% of bauxite aggregates with a particle size of 5-3mm; 7% of bauxite aggregates with a particle size of 3-1mm; 7% of bauxite aggregates with a particle size of less than 1mm; 15% of bauxite powder with a particle size of less than 0.074mm; 5~3mm lightweight aggregate (porous mullite) 12%; particle size 3~1mm lightweight aggregate (porous mullite) 8%; particle size less than 1mm lightweight aggregate (porous mullite) 3%; silicon micropowder with particle size less than 0.074mm 3%; aluminum micropowder with particle size less than 0.074mm 4%; kyanite powder with particle size less than 0.074mm 8%; high alumina cement 5%; plus 0.01% of the total mass of each component Sodium tripolyphosphate and 0.05% of the tota...

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Abstract

The invention discloses lightweight castable for a sintering ignition furnace. The lightweight castable is prepared by taking bauxite aggregate in different particle size ranges, lightweight aggregate, micro powder with the granularity of less than 0.074mm, kyanite powder with the granularity of less than 0.074mm, high-alumina cement or calcium aluminate cement, sodium tripolyphosphate and a waterreducing agent as main raw materials. The castable disclosed by the invention integrates advantages of heavyweight castable and lightweight castable, and can achieve the effects of reducing the volume density, lightening the material deadweight, effectively reducing the heat conductivity coefficient and improving the thermal insulation properties on premise of ensuring strength, erosion resistance and other key indexes. Compared with the traditional heavyweight castable, the lightweight castable disclosed by the invention has the advantages that the structural weight can be reduced by 30%, the furnace heat loss is reduced by 25-35%, and the fuel is saved by about 10%. Meanwhile, the time consumption of a baking oven is shortened, the maintenance time is saved, and the castable is suitablefor popularization and application.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a lightweight refractory castable for sintering ignition furnaces. Background technique [0002] Sintering ignition furnace is a thermal equipment for preparing sinter and pellets for blast furnace. It is used to ignite the mixture on the sintering machine. Usually, heavy low-cement high-alumina castables or corundum-mullite castables are used as furnace linings. material. However, in the sintered ignition furnace, the lining is not in direct contact with the high-temperature melt or charge. The use of heavy castables not only has a large weight, but also exerts a large force on the steel structure, which often results in damage to the lining structure, and the heat preservation performance is poor, resulting in a large number of of heat loss. Cracking, breakage, peeling and other phenomena often occur in use, the service life is only 3 to 5 years, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/08C04B35/101
Inventor 刘黎徐国涛万茂强张洪雷周旺枝
Owner 武汉钢铁有限公司
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