Tundish working lining for clean steel smelting and preparation method thereof

Abstract

The invention relates to a tundish working lining for clean steel smelting and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: mixing 43-49 wt% of magnesite particle with particle size of 11-0.2 mm, 32-39 wt% of magnesite fine powder with particle size of 1-200 mu m, 8-22 wt% of magnesium-aluminum sol and 2-5 wt% of mixture, uniformly stirring, and coating or casting to form. The mixture is prepared by mixing aluminum oxide micropowder, aluminum lactate and calcium lignosulphonate in a mass ratio of 10:(1.8-2.2):(0.7-1.3); the MgO content in the magnesite particle and magnesite fine powder is greater than or equal to 95 wt%; the mol ratio of magnesium to aluminum in the magnesium-aluminum sol is 1:(0.5-2); the Al2O3 content in the aluminum oxide micropowder is greater than or equal to 98 wt%; and the particle size of the aluminum oxide micropowder is 1-20 mu m. The tundish working lining for clean steel smelting has the advantages of low impurity content, higher strength, high molten steel corrosion resistance, high molten steel penetrating resistance, low influence on total oxygen content in molten steel, and low influence on the quantity of oxide inclusions, and is suitable to be used as a tundish working lining for clean steel smelting.

Description

technical field [0001] The invention belongs to the technical field of tundish working lining, and in particular relates to a tundish working lining for clean steel smelting and a preparation method thereof. Background technique [0002] According to the requirements of innovation and development in the "12th Five-Year Plan" of the iron and steel industry, the state will increase the intensity of upgrading and development of special steel products, and strive to replace imports and meet the new market demand for the improvement of the domestic equipment manufacturing industry. Therefore, in the iron and steel smelting process [0003] It is particularly important to strictly control the quality of molten steel in the process. The tundish is the last container for molten steel before continuous casting of molten steel. The composition, structure and performance of the refractory material in its working layer are of great significance to ensure the quality of molten steel. ...

AI Technical Summary

Problems solved by technology

Furthermore, phosphate minerals such as sodium tripolyphosphate used in coatings will increase the phosphorus content in steel during the contact process with molten steel, which is not conducive to the improvement of steel quality.

In short, the mineral composition and preparation process of existing tundish coatings can no longer meet the increasingly demanding needs of clean steel smelting