Method for realizing comprehensive utilization of iron, vanadium and titanium through low-temperature reduction roasting of vanadium titano-magnetite

Abstract

The invention discloses a method for realizing comprehensive utilization of iron, vanadium and titanium through low-temperature reduction roasting of vanadium titano-magnetite, and belongs to the field of resource utilization of vanadium titano-magnetite. The problems of strong corrosion and high energy consumption caused in the existing vanadium titano-magnetite reduction process are solved. The method comprises the steps that vanadium titano-magnetite fine powder, a carbonaceous reducing agent, a sodium modifying agent and a binder are uniformly mixed and formed to obtain pellets, and the pellets are dried; the pellets are subjected to low-temperature sodium modification reduction, and an indirect heating device capable of heating the upper portions and the lower portions of materials is adopted by a reduction device; the reduced metallized pellets are refined to 100 meshes so as to carry out hydrolysis, and separation is carried out after hydrolysis to obtain a slag-iron mixture and first filtrate; magnetic separation on the slag-iron mixture is carried out to obtain slag and metal iron powder; primary carbon separation is carried out on the first filtrate, and filtering and separating are carried out to obtain SiO2 and Al2O3 precipitates and second filtrate; secondary carbon separation is carried out on the second filtrate, and filtering and separating are carried out to obtain ammonium metavanadate precipitates and third filtrate; and third-time carbon separation is carried out on the third filtrate. The method can realize green high-added-value utilization of vanadium, titanium and iron with low coal consumption.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of vanadium-titanium magnetite resources, in particular to a method for realizing comprehensive utilization of iron, vanadium and titanium by low-temperature reduction roasting of vanadium-titanium magnetite. Background technique [0002] Vanadium-titanium magnetite is an important mineral resource in my country. After decades of research, it can be recovered by blast furnace, but the grade of titanium-containing slag in blast furnace is only about 20%, which is not easy to use. In addition, the comprehensive recovery rate of vanadium is only 70%. ~80% level. [0003] Some people in China have tried the non-blast furnace sodium reduction method. The typical method is to use a tunnel kiln for reduction. Sodium carbonate, coal powder, vanadium-titanium magnetite and other pressure balls are added to the silicon carbide tank and heated to 1150-1250 in the tunnel kiln. ℃ reduction, c...

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Problems solved by technology

But because sodium carbonate has a low melting point, is easy to volatilize, and is highly corrosive, the problem brought by this method is that the use of silicon carbide is only a few times, and the production cost is too high. In addition, the reduction energy consumption of the tunnel kiln is too high, and the coal consumption for the reduction of one ton of metal iron reaches more than 1000 kg, and more than 6GJ of gas supplementary heating is required, which further reduces the economical efficiency of the technology.

This process has been tried in many domestic units, but failed to produce

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