Non-blast-furnace iron making process for directly reducing vanadium titanomagnetite through gas-based shaft furnace

Abstract

The invention discloses a non-blast-furnace iron making process for directly reducing vanadium titanomagnetite through a gas-based shaft furnace. The non-blast-furnace iron making process comprises the following steps of: (a) charging vanadium titanomagnetite oxidized pellet materials into the shaft furnace; (b) introducing reducing gas at the temperature of between 900 and 1,100DEG C and the pressure of between 0.35 and 0.65MPa through the bottom of the shaft furnace, and performing reduction reaction with the vanadium titanomagnetite; and (c) discharging metalized materials generated in thereaction through the lower part of the shaft furnace. In the process, gas prepared from noncoking coal is used as a reducer to reduce the vanadium titanomagnetite, the dependence of the traditional flow to coking coal is greatly reduced, and smelting energy is diversified; and compared with the traditional process, the process has the advantages that: three metals, namely vanadium, titanium and iron are comprehensively recovered, the recovery rate of the titanium element is particularly improved, full vanadium titanomagnetite is charged into the furnace to be melted, the titanium dioxide content of slag in the subsequent smelting process of the reduced sponge iron is over 47 percent, the slag can directly serve as a raw material for preparing titanium white, the resource utilization rate is improved, and the pollution to the environment and the occupation of land resources caused by slag stacking are avoided.

Description

technical field [0001] The invention relates to an ironmaking process, in particular to an ironmaking process for vanadium-titanium magnetite. Background technique [0002] The reserves of vanadium-titanium magnetite in Panxi area are more than 10 billion tons, and it is rich in various useful elements such as iron, vanadium and titanium, and has extremely high comprehensive utilization value. After more than 40 years of development, the region has formed a production capacity of more than 10 million tons of vanadium-titanium magnetite concentrate, but the utilization of vanadium-titanium magnetite is still the traditional "blast furnace-converter" process. However, there are still inherent deficiencies: First, because of its strong dependence on metallurgical coke, although more than 6 billion tons of coal resources have been proven in the Panxi area, only 1 billion tons of coking coal is available For metallurgical production, 5 billion tons of non-coking coal cannot be u...

AI Technical Summary

Problems solved by technology

After more than 40 years of development, the region has formed a production capacity of more than 10 million tons of vanadium-titanium magnetite concentrate, but the utilization of vanadium-titanium magnetite is still the traditional "blast furnace-converter" process. However, there are still inherent deficiencies: First, because of its strong dependence on metallurgical coke, although more than 6 billion tons of coal resources have been proven in the Panxi area, only 1 billion tons of coking coal is available For metallurgical production, 5 billion tons of non-coking coal cannot be used nearby

As a result, on the one hand, a large amount of metallurgical coal had to be purchased from other places, and on the other hand, Panxi African coking coal had to be transported to various places, which not only caused a lot of economic waste, but also caused great pressure on road transportation; The comprehensive recycling capacity is low when the metal symbiosis mine

Due to the characteristics of vanadium and titanium resources and the resulting technical obstacles, this process can only recover iron and vanadium in vanadium-titanium magnetite, but titanium enters the blast furnace slag in the form of titanium dioxide, which is not recycled; Because high-titanium slag is too viscous, it is easy to block the blast furnace. Therefore, although the blast furnace technology is becoming more and more mature, the titanium dioxide content in the blast furnace slag is still required to be below 22%. This deficiency determines that the ratio of vanadium and titanium materials into the furnace must be lower than 60%.

Calculated by smelting 10 million tons of vanadium-titanium magnetite annually, about 6 million tons of ordinary ore should be added every year, and about 8 million tons of blast furnace slag containing about 22% titanium dioxide should be produced. This kind of blast furnace slag can neither be used as a renewable resource cycle Utilization does not have the value of comprehensive recycling. Currently, it can only be stockpiled nearby, causing huge pressure on land and environmental protection. At the same time, the annual loss of titanium dioxide reaches 1.2 million tons.

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