Small wear-resistant bush for blast-furnace tuyere and manufacture method thereof

A manufacturing method and tuyere technology, applied in the direction of the tuyere, can solve the problems of not being able to change the area of ​​the small set of tuyere in stock, limited wear resistance, and easy fatigue and stratification during use, so as to achieve good resistance to rapid cooling and rapid heating, prolong service life, The effect of avoiding wind loss

Active Publication Date: 2014-05-21
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For improving the wear resistance of the small sleeve, there are also methods of ion spraying wear-resistant coating and surfacing wear-resistant alloy, but because the coating of ion spraying is thin, the wear resistance is limited; It is difficult to keep the sleeve material consistent, resulting in easy fatigue and delamination during use, and the surfacing operation is complicated
In addition, for the situation where it is necessary to control the smelting intensity by adjusting the air intake, a small set of tuyere bushing is generally used to reduce the area of ​​the tuyere to control the smelting intensity, but it is easy to be blown into the blast furnace due to the high-speed airflow; If the type of small tuyere area is small, the production cycle will be too long, and the tuyere area of ​​the small set in stock cannot be changed, which will easily cause waste

Method used

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  • Small wear-resistant bush for blast-furnace tuyere and manufacture method thereof
  • Small wear-resistant bush for blast-furnace tuyere and manufacture method thereof
  • Small wear-resistant bush for blast-furnace tuyere and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Put the inner wall of the new small sleeve that needs to be lined upright after derusting and grease removal, and then place it vertically on the pre-made platform. According to the size of the inner hole of the prefabricated wear-resistant lining, select a suitable inner mold to be coaxial with the inner wall of the small sleeve Install and fix; pour 60kg of corundum, 15kg of mullite and 25kg of silicon carbide in total 100kg into the forced mixer and stir for 3 minutes, then add 7.5kg of aluminum sol and 7.5kg of silica sol, and continue stirring for 5 minutes to obtain Castable: pour the mixed castable between the small sleeve and the inner mold to fill up the space; take off the inner mold after the small sleeve poured with wear-resistant lining is naturally air-dried for 4 hours; put the wear-resistant lining Together with the small sleeve, use a gas fire to raise the temperature at a rate of 1°C / min, so that the surface temperature of the wear-resistant lining rise...

Embodiment 2

[0040] The inner wall of the new small sleeve that needs to be lined is derusted and grease-removed. According to the size of the inner hole of the prefabricated wear-resistant lining, a suitable mold and small sleeve are installed and fixed to form a lining cavity; corundum 60kg, Molai 8kg of stone and 12kg of silicon carbide totaling 80kg were poured into the vertical mixer and stirred for 2 minutes, then 18kg of silica sol was added, and the castable was obtained after stirring for 3 minutes; pour the stirred castable between the small sleeve and the inner mold It is enough to fill the space with vibration; the small sleeve cast with wear-resistant lining is dried at a low temperature of 60°C for 2 hours, and then the mold is removed; The surface temperature of the wear-resistant lining rises to 250°C, and then the small sleeve is connected with cooling water and kept warm for 4 hours. Under the condition of water cooling, the temperature is raised at a rate of 2°C / min, so t...

Embodiment 3

[0042]The inner wall of the new small sleeve that needs to be lined is derusted and grease-removed. According to the size of the inner hole of the prefabricated wear-resistant lining, a suitable mold and small sleeve are installed and fixed to form a lining cavity; corundum 84kg, Molai 16kg of stone and 20kg of silicon carbide totaling 120kg were poured into the twin-shaft mixer and stirred for 5 minutes, then 16kg of aluminum sol was added, and the castable was obtained after stirring for 10 minutes; pour the stirred castable between the small sleeve and the inner mold Just fill the space with vibration; take off the mold after 8 hours of natural air-drying for the small sleeve poured with wear-resistant lining; heat the wear-resistant lining together with the small sleeve at a rate of 1°C / min in an oven to make the wear-resistant The surface temperature of the inner lining rises to 350°C, and then the small sleeve is connected with cooling water and kept warm for 2 hours. Und...

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Abstract

The invention discloses a small wear-resistant bush for a blast-furnace tuyere and a manufacture method thereof. A hollow wear-resistant lining is poured or embedded in the inner wall of the small bush. The manufacture method comprises the steps: mold cavity arrangement, material preparation, pouring, drying and baking, and specifically comprises the steps: a, mold cavity arrangement: forming a mold cavity by a mould and the inner wall of the small bush; b, material preparation: stirring aggregates firstly and then adding a binder to obtain a pouring material through stirring; c, pouring: placing the pouring material into the mold cavity of the small bush; d, drying: drying for 2-8 hours after pouring and removing the mould; and e, baking: raising the temperature until the surface temperature of the lining is 250-350 DEG C, preserving heat for 2-4 hours, continuously raising the temperature to 450-550 DEG C, and preserving the heat for 2-4 hours. According to the invention, not only is the wear resistance of the small bush improved, but also tuyere diameter of the stored and worn small bush can be reduced to further control smelting intensity, in addition, the manufactured lining is low in linear change rate after being burned at high temperature, is improved linearly in medium, low and high temperature strength, and is resistant to scouring, and good in resistance to quick cooling and heating, and the small wear-resistant bush is simple in manufacture process and flexible in pore diameter regulation of the lining.

Description

technical field [0001] The invention belongs to the technical field of blast furnace smelting equipment, and specifically relates to a blast furnace tuyere wear-resistant small cover with simple process, flexible aperture adjustment, low line change rate after high-temperature burning of the lining, good erosion resistance, and rapid cooling and rapid heat resistance performance, and a manufacturing method thereof . Background technique [0002] The small blast furnace tuyere is an important equipment in the air intake system of the ironmaking blast furnace, which is responsible for transporting pulverized coal and combustion-supporting air above 1000°C into the blast furnace. Because the inner wall of the small sleeve has to withstand the scour of high-temperature, high-speed gas, and even the abrasion of the high-speed coal powder of the coal injection pipe, it is easy to cause the inner wall of the small sleeve to expand and be damaged; because the front end of the small ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/16C04B35/66B28B1/14
Inventor 李信平张志明王楠代洁邬伟刚彭运涛
Owner WUKUN STEEL
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