A kind of chrome-magnesium-zirconium drainage sand and its preparation method

Abstract

The invention discloses a chrome-magnesia-zircon stuffing sand which contains the following components in percentage by mass: 36+ / -3% of Cr2O3, 14+ / -2% of MgO, 16+ / -2% of Al2O3, 11+ / -2% of SiO2, 16+ / -2% of Fe2O3, 24+ / -2% of ZrO, less than 0.5% of H2O and the balance of C. The particles with the particle size of 0.15-2mm account for 96% of the total sand. By introducing the zircon material into the chrome-magnesia-zircon stuffing sand as a film coating material, the high-temperature-resistant zirconium oxide completely covers all the other materials to coat a zirconium oxide powder layer on the surface of the stuffing sand grains, thereby enhancing the refractoriness of the stuffing sand. The stuffing sand has high refractoriness, high heat stability and high sintering resistance, and thus, achieves the goal of enhancing the pouring rate.

Description

technical field [0001] The invention relates to a composition, specifically a composition using different materials and proportions. Background technique [0002] In the 1980s, our country mainly used siliceous drainage sand. In the 1990s, the introduction of magnesia materials developed into silicon-magnesium drainage sand. With the continuous development of domestic steelmaking technology, my country has introduced from Japan since 2002. Chromium drainage sand gradually evolved to localization. However, with the continuous development of the national economy, the continuous research and development of high-tech special steel products and the expansion of demand, chrome drainage sand can no longer meet the requirements of special steel, and there is an urgent need for a high-aluminum, high-manganese, low-carbon, high-quality Drainage sand product with high automatic casting rate of alloyed steel. [0003] When smelting high-manganese, low-carbon, high-aluminum, and high-al...

AI Technical Summary

Problems solved by technology

However, with the continuous development of the national economy, the continuous research and development of high-tech special steel products and the expansion of demand, chrome drainage sand can no longer meet the requirements of special steel, and there is an urgent need for a high-aluminum, high-manganese, low-carbon, high-quality Drainage sand products with high automatic pouring rate of alloyed steel

[0003] When smelting high-manganese, low-carbon, high-aluminum, and high-alloy steel types, the temperature of molten steel is high due to low carbon, the oxygen content is high, and the amount of metal aluminum added is large, so that the smelting process takes a long time and the molten steel reacts violently. When the acid aluminum content in the water is high, it is easy to mix with the Gr in the drainage sand 2 o 3 , SiO 2 The reduction reaction of the components causes the refractoriness of the drainage sand to decrease and the sintering is serious, while the high-alloyed steel types, especially heavy metal elements such as Mn, Ni, Mo, and Ti, have a large specificity, a high addition ratio, and a long melting and alloying reaction time. Poor distribution uniformity in molten steel will lead to excessively long refining time, and Fe in chrome drainage sand currently used in China 2 o 3 The content of iron oxide is high, and the iron oxide component is a kind of flux in high temperature environment, which reduces the high temperature sintering performance of drainage sand, which often leads to more than 98% of the opening pouring in general steel types, and the opening pouring when used in the above steel types If the rate is less than 40%, oxygen burning treatment must be carried out when the ladle does not open automatically, which not only affects the normal progress of the steelmaking process, but also seriously endangers the quality of the steel.

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