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Manufacturing method for prolonging service life of KR stirrer

A production method and agitator technology, which are applied in the direction of stirring devices, furnaces, lighting and heating equipment, etc., can solve the problems of KR agitator scrapping, pouring material falling off, buffering effect limitation, etc., achieve low crack number, reduce expansion degree, The effect of cushioning extrusion stress

Active Publication Date: 2012-09-05
宜兴市瑞华工业炉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of KR agitator, the most difficult thing to deal with is how to reduce the extrusion internal stress caused by the difference in thermal expansion between the two materials of the agitator complex (castable and steel core) during the baking process; During the baking process, due to the extrusion force of the steel core, cracks of different thicknesses appear inside and on the surface of the castable. During service, molten iron penetrates into the material interface through the cracks and causes large pieces of the castable to fall off, causing the KR mixer to be scrapped in advance.
[0004] In order to improve this phenomenon, some measures have been taken, such as wrapping one or several layers of plastic materials on the surface of the steel core, and further applying a layer of buffer coating on the surface. These measures have played a certain role in reducing the stress difference, but at high temperatures Under these conditions, the cushioning effect of these materials is limited due to melt flow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First select the steel core, remove impurities from its surface, rinse it and dry it; weld a group of rivets with different heights on the surface of the steel core, the height is 30-40mm; cover the surface of the steel core with a layer of 20mm thick refractory fiber material , the density of the refractory fiber material is 200kg / m 3 , the thermal conductivity is 0.085W / m.k, and the service temperature reaches 1200°C; a layer of castable is coated on the refractory fiber material layer, and the thickness of the castable is 60-80mm; after the castable is coated, the whole device is baked for 48 hours at a temperature of 115 °C; continue to heat the baked device to make the temperature reach 350 °C for 14 hours.

Embodiment 2

[0020] First select the steel core, remove impurities from its surface, rinse it and dry it; weld a group of rivets with different heights on the surface of the steel core, the height is 40-50mm; cover the surface of the steel core with a layer of 10mm thick refractory fiber material , the refractory fiber material density is 280kg / m 3 , the thermal conductivity is 0.085W / m.k, and the service temperature is 1300°C; coat a layer of castable on the refractory fiber material layer, with a thickness of 60-100mm; after coating the castable, bake the whole device for 60 hours at a temperature of 135°C ;Continue to heat the baked device to make the temperature reach 340°C for 12h.

Embodiment 3

[0022] First select the steel core, remove impurities from its surface, rinse it and dry it; weld a group of rivets with different heights on the surface of the steel core, with a height of 60-70mm; cover the surface of the steel core with a layer of 50mm thick refractory fiber material , the refractory fiber material density is 190kg / m 3 , the thermal conductivity is 0.085W / m.k, and the service temperature reaches 1400°C; coat a layer of castable on the refractory fiber material layer, with a thickness of 90-110mm; after coating the castable, bake the entire device for 60 hours at a temperature of 150°C; Continue to heat the baked device until the temperature reaches 320°C for 8 hours.

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Abstract

The invention discloses a manufacturing method for prolonging the service life of a KR stirrer, specifically comprising the steps of: selecting a steel core, removing impurities on the surface of the steel core, washing and cleaning the steel core, and airing; welding a group of riveting pieces with different heights ranging from 30mm to 80mm on the surface of the steel core; covering a refractory fiber material layer with the thickness of 0-50mm on the surface of the steel core, coating a castable layer with the thickness of 60-120mm on the refractory fiber material layer, and baking the entire device for 36-60h at the temperature of 80-100 DEG C; and continuously heating the baked device to ensure that the temperature reaches 320-350 DEG C, and maintaining the temperature for 8-16h. Themethod is simple and energy-saving, and the used materials are not molten at high temperature and can stop the heat from being transmitted to the steel core, therefore, not only is the expansion degree of the steel core alleviated, but also the extrusion stress generated due to the expansion of the steel core can be effectively buffered so that the quantity of the cracks generated after the KR stirrer is baked can be reduced to the minimum.

Description

technical field [0001] The invention belongs to the field of metal smelting, and in particular relates to a preparation method for improving the service life of a KR agitator. Background technique [0002] The KR stirring desulfurization method is a desulfurization technology outside the molten iron furnace that Japan's Nippon Steel Wentian Iron Works began to study in 1963 and was applied to industrial production in 1965. The desulfurization method has the characteristics of high desulfurization efficiency, less desulfurization agent consumption, short operation time, low metal consumption and low refractory material consumption. In the 1970s, my country's Wuhan Iron and Steel introduced KR stirring desulfurization technology from Japan's Nippon Steel, and other domestic companies also successively introduced or designed and prepared KR stirring desulfurization production lines, which opened up a new pattern for the development of my country's molten iron desulfurization te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D27/00C21C7/064
Inventor 张奚东王建东
Owner 宜兴市瑞华工业炉科技有限公司
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