Process for comprehensively utilizing vanadium-titanium magnetite through chain grate roasting, gas-based shaft furnace prereduction, and electric furnace deep reduction

Abstract

The invention discloses a process for comprehensively utilizing vanadium-titanium magnetite through chain grate roasting, gas-based shaft furnace prereduction, and electric furnace deep reduction. Theprocess comprises the following steps: (1) oxidized pellet preparation: uniformly mixing vanadium-titanium magnetite concentrate, a binder and water in a ratio, pelletizing to obtain vanadium-titanium magnetite green pellets with qualified particle sizes, conveying the green pellets into a chain grate, and carrying out drying and oxidation roasting to obtain vanadium-titanium magnetite oxidized pellets; (2) gas-based shaft furnace prereduction; (3) electric furnace deep reduction: filing the vanadium-titanium magnetite prereduction pellets into an electric furnace and carrying out deep reduction, adding a flux and proportioned carbon, controlling a melting temperature to be 1550-1650 DEG C, and separating to obtain vanadium-containing molten iron and titanium-containing slag; and (4) using the obtained vanadium-containing molten iron for vanadium extraction in a converter, and carrying out titanium extraction on the titanium-containing slag through a sulfuric acid method. According tothe process, the reduction degradation rate for the oxidized pellets is greatly reduced, so that the requirement of the subsequent shaft furnace reduction can be met; and efficient and clean utilization for iron, vanadium and titanium is realized, and meanwhile, the cost is reduced, and the production efficiency is increased.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of vanadium-titanium ore, and in particular relates to a process for comprehensively utilizing vanadium-titanium magnetite by chain grate roasting-gas-based shaft furnace pre-reduction-electric furnace deep reduction. Background technique [0002] my country has huge reserves of vanadium-titanium magnetite resources, but the overall level of development and utilization is still very low. Taking vanadium-titanium magnetite resources in Panxi area as an example, in the production process dominated by steel, the current recovery and utilization of titanium and vanadium Therefore, improving the comprehensive utilization level of my country's vanadium-titanium magnetite resources is of great significance to the development of my country's steel and vanadium-titanium industries. [0003] Among the processing methods for vanadium-titanium magnetite concentrate, the non-blast furnace method can rea...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems that the preparation process of oxidized pellets in the prior art requires a lot of equipment, large investment, low production efficiency, poor economic benefits, and high reduction pulverization rate of vanadium-titanium-magnetite oxidized pellets, the present invention The purpose is to provide a process for the comprehensive utilization of vanadium-titanium magnetite by grate roasting-gas-based shaft furnace pre-reduction-electric furnace deep reduction, so as to improve the existing process and realize efficient and clean utilization of iron, vanadium and titanium. At the same time reduce energy consumption and equipment investment, improve production efficiency

Images