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Fast-setting castable for main runner for COREX furnace and production technology thereof

A castable and process technology, applied in the field of quick-drying castables in the main trench of COREX furnace, can solve the problems of waste of resources, affecting production, spalling, etc., and achieve excellent results

Inactive Publication Date: 2011-07-06
长兴煤山新型炉料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high tapping temperature and high pressure of the COREX furnace, and the large fluctuations in the temperature of molten iron, the amount of iron in ordinary low-cement castables can only reach the level of about 40,000 tons without repairs.
Ordinary low-cement castables cannot meet the on-site requirements of iron tapping within 8 hours of operation, which affects production
Even if it is used forcibly, the gunning material can only pass through the iron after repairing and does not exceed 10,000 tons, which is a serious waste of resources.
Once the amount of iron is increased, the refractory material on the side wall of the main ditch will peel off in a large area when the iron is more than 30,000 tons, posing a safety hazard

Method used

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  • Fast-setting castable for main runner for COREX furnace and production technology thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The particle size and mass percentage of each component are:

[0085] Fused dense corundum 5-8mm: 12%;

[0086] Brown corundum 3~5mm: 22%;

[0087] Tabular alumina 1~3mm: 20%;

[0088] Activated alumina powder <3um: 14%;

[0089] Silicon carbide 1~3mm: 8%;

[0090] 320 mesh silicon carbide 0.048mm: 12%;

[0091] Spherical asphalt: 5%;

[0092] Metal magnesium powder: 1%;

[0093] Sodium hexametaphosphate: 0.8%;

[0094] Lithium carbonate: 0.4%;

[0095] Polyethylene organic fiber: 2.8%;

[0096] Silicon fume: 2%.

[0097] Such a ratio is suitable for use as a castable in the manufacture of new trenches, with strong thermal shock resistance and good erosion resistance.

Embodiment 2

[0099] The particle size and mass percentage of each component are:

[0100] Fused dense corundum 5-8mm: 15%;

[0101] Brown corundum 3~5mm: 20%;

[0102] Tabular alumina 1~3mm: 20%;

[0103] Activated alumina powder <3um: 12%;

[0104] Silicon carbide 1~3mm: 9%;

[0105] 320 mesh silicon carbide 0.048mm: 11%;

[0106] Spherical asphalt: 3.3%;

[0107] Metal aluminum powder: 1%;

[0108] Sodium hexametaphosphate: 1%;

[0109] Lithium carbonate: 0.7%;

[0110] Polyethylene organic fiber: 4%;

[0111] Silicon fume: 3%.

[0112] This kind of ratio has good explosion-proof effect, more lithium carbonate, and strong quick-drying ability, so it is more suitable as a repair material. The following table is the performance index that the present invention reaches:

[0113]

[0114] It can be seen that the effect of the present invention is higher than the national requirement.

[0115] The present invention also relates to a process for producing quick-drying castables ...

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Abstract

The invention aims to provide a fast-setting castable for a main runner for a COREX furnace and a production technology thereof. The fast-setting castable for the main runner for the COREX furnace can be used for repairing the main runner within a short time in the thermal state as well as for tapping recovery, further ensures the consistency of production, is long in service life and convenient for repairing operation and reduces the labor intensity of workers. To achieve the effects, the fast-setting castable for the main runner for the COREX furnace is characterized in that the fast-setting castable comprises the following components: aluminas, silicon carbide, carbonaceous materials and additives. Through the technical scheme, the aluminas different in nature and grain size are mixed according to the specific percentage, and since the extra additives and the novel processing technique are adopted, the newly cast runner can allow 80,000 tons iron to be output; the service life of the fast-setting castable is more than twice of that of the former ordinary low cement castable; and furthermore, the fast-setting castable is particularly outstanding in fast-setting, can meet the requirements of on-site tapping within 8-hour operating time and has remarkable effect as a repairing material.

Description

technical field [0001] The invention relates to a casting material, in particular to a quick-drying casting material for a main ditch of a COREX furnace. The invention also relates to the production process of the quick-drying castable. Background technique [0002] COREX furnace is a method of ironmaking without blast furnace (ie smelting reduction method). Since COREX has reduced the production process, various pollutant emissions have also been greatly reduced, and the sulfur dioxide emission is only 4.9% of that of the blast furnace. Therefore, the residual energy, waste heat, by-product gas, solid waste, etc. generated in the production will be comprehensively utilized to form a complete industrial chain of circular economy in the iron and steel manufacturing industry. The world's largest and China's first COREX smelting reduction clean smelting system was completed in Luojing Engineering Base of Baosteel Group Pudong Iron and Steel Company, which marks a big step for...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 张文许华佘春霞
Owner 长兴煤山新型炉料有限公司
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