Blast furnace smelting method of high-grade high-vanadium chromium-contained type vanadium-titanium iron ore concentrates

Abstract

A blast furnace smelting method of high-grade high-vanadium chromium-contained type vanadium-titanium iron ore concentrates comprises the following steps that (1) high-grade high-vanadium chromium-contained type vanadium-titanium iron ore concentrate fines, iron ore concentrate powder, magnesite, lime, return mines and fuel are mixed, and high-magnesium sintered ore is made; (2) high-grade high-vanadium chromium-contained type vanadium-titanium iron ore concentrate fines, bentonite and fuel are compacted to be pellets; (3) the high-magnesium sintered ore and the pellets are mixed, lump iron is added, and blast furnace burden materials are made; (4) blast furnace smelting is started, and blast furnace smelting comprises a charging system, an air blowing system, a thermal system and a slag forming system; the wind-warm syndrome is 1100-1200 DEG C, the coke ratio is 330-380 kg / t, and the coal ratio is 160-200 kg / t; and (5) tapping is conducted on molten iron every 70-90 min, and the temperature of the molten iron is 1430-1500 DEG C. According to the blast furnace smelting method of the high-grade high-vanadium chromium-contained type vanadium-titanium iron ore concentrates, the proportion of the high-vanadium chromium-contained type vanadium-titanium iron ore concentrates in blast furnace smelting raw materials is improved, and the ironmaking cost is reduced; and the blast furnace utilization factor is improved, the comprehensive coke ratio is greatly reduced, and meanwhile the metal yield is kept at a high level.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to a blast furnace smelting method for high-grade, high-vanadium, chromium-containing vanadium-titanium magnetite concentrate. Background technique [0002] High-vanadium chromium-containing vanadium-titanium magnetite has large reserves of vanadium resources and is widely distributed all over the world, such as Russia's Kuranakh Mine, China's Panxi Hongge Mine and Chengde Ultra-lean Mine. The research on the non-blast furnace process of magnetite has achieved some research results, but the blast furnace process is still the most important process to realize the large-scale industrial utilization of vanadium-titanium magnetite resources now and in the future. In order to achieve a high level of large-scale development and utilization of high-vanadium chromium-containing vanadium-titanium magnetite resources, comprehensively recover valuable components such as iron, van...

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Problems solved by technology

[0003] TiO of high-grade high-vanadium chromium-containing vanadium-titanium magnetite concentrate 2 and Al 2 o 3 Higher content, blast furnace production will lead to TiO in blast furnace slag 2 and Al 2 o 3 The content of slag has increased, resulting in an increase in the viscosity of the slag, resulting in a series of problems such as a decrease in the desulfurization capacity of the slag and difficulties in the separation of slag and iron.

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