Method for preventing slag from being accumulated at center of high-chromium vanadium-bearing titanomagnetite hearth

Abstract

The invention relates to the field of blast furnace ironmaking methods, in particular to a method used for preventing slag from being accumulated at the center of a high-chromium vanadium-bearing titanomagnetite hearth and capable of effectively eliminating the slag accumulation at the center of the high-chromium vanadium-bearing titanomagnetite hearth. The slag mainly comprises, by mass, 0.35-0.50% of Cr2O3, 25-28% of CaO, 23.5-26% of SiO2, 7-11% of MgO, 13-15% of Al2O3 and 20-23% of TiO2. According to the method, by precisely adjusting the proportion of the main components in the slag, the thermal stability, the chemical stability and flowability of the slag are optimized effectively, and the slag is made to have the suitable melting temperature and the sufficient desulfurization capacity, so that the situation of the slag accumulation at the center of the high-chromium vanadium-bearing titanomagnetite hearth is prevented. According to the method, the modification of an original scheme is small, the slag accumulation state is improved greatly on the premise of guaranteeing the production efficiency, and the method is especially suitable for the production performed in the high-chromium vanadium-bearing titanomagnetite hearth.

Description

technical field [0001] The invention relates to the field of blast furnace ironmaking methods, in particular to a method for preventing the accumulation of slag in the hearth center of a high-chromium type vanadium-titanium magnetite hearth. Background technique [0002] Blast furnace smelting requires slag to have good thermal and chemical stability, good fluidity, suitable melting temperature and sufficient desulfurization capacity. For TiO in slag 2 For high-titanium type blast furnace slag with a mass fraction exceeding 20%, except for non-high-titanium type blast furnace slag (excluding TiO 2 、TiO 2 In addition to the general characteristics of mass fraction less than 20%), it also has high melting temperature, poor desulfurization ability, and TiO in slag 2 The characteristic of easy reduction leads to thickening of slag, which further increases the difficulty of smelting vanadium-titanium magnetite in blast furnace. In addition to TiO 2 In addition, vanadium-tita...

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Problems solved by technology

For TiO in slag 2 For high-titanium type blast furnace slag with a mass fraction exceeding 20%, except for non-high-titanium type blast furnace slag (excluding TiO 2 、TiO 2 In addition to the general characteristics of mass fraction less than 20%), it also has high melting temperature, poor desulfurization ability, and TiO in slag 2 Easy reduction leads to thickening of slag, which further increases the difficulty of blast furnace smelting vanadium-titanium magnetite

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