Method for comprehensively using vanadium-titanium magnetite by shaft furnace reduction and electric furnace melting

A vanadium-titanium magnetite and electric furnace technology, applied in electric furnaces, shaft furnaces, furnaces, etc., can solve the problems of rapid temperature drop, high pressure, and unfavorable reactions of reducing gas, and achieve the effect of alleviating the increasingly tense

Active Publication Date: 2013-01-30
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology

[0012] The pressure is high, and the pressure-bearing capacity of the equipment is high; the volume ratio of H2 and CO is relatively high. Since the reduction of H2 is an endothermic reaction, the temperature of the reducing gas in the shaft furnace drops rapidly, which is not conducive to the reaction;

Method used

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  • Method for comprehensively using vanadium-titanium magnetite by shaft furnace reduction and electric furnace melting

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Effect test

Embodiment 1

[0039] Example 1: The vanadium-titanium magnetite concentrate (TFe 43.2%, FeO 16.8%, V2O 51.2%, TiO2 1.6%) with a particle size of -0.074mm accounting for 60% is mixed with a binder to make 10-15mm pellets are dried at 200°C for 2 hours, roasted at 1100°C for 3 hours, then loaded into a shaft furnace, and reduced in a shaft furnace at 1100°C for 4.5 hours, wherein the pressure of the reducing gas is 0.3 MPa, and the H2+CO in the reducing gas ≈92%, and the molar ratio of H2 to CO is 2.8. The direct reduction product is put into an electric furnace for melting and separation. The melting temperature is 1650°C. The analysis of the molten iron element is TFe94.8%, V2O50.2%, TiO20.06%, and the molten slag element analysis is TFe5%, V2O52.8 %, TiO2 54.4%. From vanadium-titanium magnetite concentrate to smelting stage, the recovery rates of iron, vanadium and titanium are 95%, 92% and 99% respectively.

Embodiment 2

[0040] Example 2: The vanadium-titanium magnetite concentrate (TFe 55.9%, FeO 22.8%, V2O50.53%, TiO2 11.8%) with a particle size of -0.074mm accounting for 75% was added to the binder and mixed evenly to produce 10-15mm pellets were dried at 200°C for 2 hours, roasted at 1100°C for 3 hours, then loaded into a shaft furnace, and reduced in a shaft furnace at 1050°C for 5.5 hours, wherein the pressure of the reducing gas was 0.2 MPa, and H2+CO in the reducing gas ≈90%, and the molar ratio of H2 to CO is 1.6. The direct reduction product is put into an electric furnace for melting and separation. The melting temperature is 1550°C. The analysis of molten iron elements is TFe94%, V2O5 0.1%, TiO2 0.05%, and the analysis of molten slag elements is TFe 9%, V2O5 2.2%, and TiO2 52.7%. . From vanadium-titanium magnetite concentrate to smelting stage, the recovery rates of iron, vanadium and titanium are 97%, 91% and 99% respectively.

[0041] Beneficial effects of the present invention...

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Abstract

The invention discloses a method for comprehensively using vanadium-titanium magnetite by shaft furnace reduction and electric furnace melting, characterized by: mixing vanadium-titanium magnetite concentrates with a binder to prepare oxidized pellets, reducing in a gas base shaft furnace at 900-1200 DEG C under the pressure of 0.2-0.3Mpa for 4-6 h, wherein the content of the reducing gas that is a mixture of H2 and CO is no less than 90%, and the molar ratio of H2 to CO is 1-3; putting the reduction product into the electric furnace for melting and conducting slag-iron separation to obtain molten iron and slag, wherein the slag contains vanadium-titanium and is used for vanadium extraction and titanium extraction. According to the invention, effectively extraction and utilization of titanium can be realized; there is no need for coke and no coking coal is consumed, thus the increasing insufficiency of coking coal resource is alleviated.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of vanadium-titanium magnetite, in particular to a method for comprehensive utilization of vanadium-titanium magnetite by using shaft furnace reduction-electric furnace melting. Background technique [0002] Vanadium-titanium magnetite is a compound paragenetic ore, mainly composed of iron, vanadium and titanium, accompanied by a small amount of chromium, gallium, platinum and other elements, which has high comprehensive utilization value. The metal minerals in the mine include titano-magnetite, ilmenite, magnetite, limonite, pyrrhotite, etc. The mineral composition is complex and the comprehensive extraction is difficult. [0003] For the processing and utilization of vanadium-titanium magnetite ore concentrate obtained after beneficiation, it mainly revolves around how to effectively recover iron, vanadium and titanium. The sintering-blast furnace-converter process is currently the main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02C21C5/52C22B1/24C22B1/02
CPCY02P10/20
Inventor 吴道洪李志远周传仓
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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