Preparation method of fluorine-containing low-silicon sintering ore

Abstract

The invention relates to a preparation method of fluorine-containing low-silicon sintering ore, belonging to the technical field of metallurgy. Raw materials are fluorine-containing iron ore concentrate, import fine ore, solvent and fuel, wherein the fluorine-containing iron ore concentrate accounts for 80-85% of sintered iron material, and the import fine ore accounts for 15-20% of the sintered iron material; F content in the iron ore concentrate is 0.1-0.3%, and grain composition of minus 200 meshes of the iron ore concentrate accounts for more than 85%; ratio of home grown iron ore concentrate A to home grown ultrafine iron ore concentrate is regulated, SiO2 content is controlled to be 4.0-4.2%, two solvents such as limestone flour and ground quick lime are used for controlling basicity to be 2.3-2.5, dolomite dust with coarse granularity or light roasting dolomite dust with fine granularity is used for controlling MgO content to be 2.1-2.3%. After low silicon sintering is carried out, the SiO2 content of the sintering ore is reduced, thus grade of the sintering ore is improved, metallurgy performance of the sintering ore is improved, reduction performance is improved to 86.94% from 85.14%, slag quantity is reduced, and the preparation method is beneficial to improving blast furnace index.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a preparation method of fluorine-containing low-silicon sintered ore. Background technique [0002] At present, economically developed countries, such as Japan, can sinter SiO 2 The content is reduced to about 3.0%, and the pellet sintering process is adopted, SiO 2 The content can be reduced to less than 4.5%; SiO in sintered ore in some countries in Western Europe 2 The content has dropped below 4.0%; SiO in sinter in some Nordic countries 2 The content was reduced to 3.0%. However, at the 2000 National Ironmaking Work Annual Conference in my country, the production of high-iron and low-silicon sintered ore has been included in the "Tenth Five-Year Plan" development guideline. In my country, blast furnaces that use purchased iron ore as the main raw material, such as Baosteel and Shaogang, also started research in this area in the late 1990s. SiO in their sinters 2 The co...

AI Technical Summary

Problems solved by technology

The silica in its self-produced iron concentrate is more complicated than that in domestic ordinary iron concentrate, and the silica in its self-produced iron concentrate exists in the form of complex silicates. However, the silicon dioxide in domestic ordinary iron concentrates exists in free form, which makes it more difficult to implement low-silicon sintering of self-produced iron concentrates