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

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 ...

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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

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