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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 reduction in reducing gas temperature, unfavorable reactions, high pressure, etc., and achieve the effect of relieving the increasingly tense

Active Publication Date: 2014-04-16
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Examples

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Effect test

Embodiment 1

[0039] Example 1: Vanadium-titanium magnetite concentrate (TFe 43.2%, FeO 16.8%, V2O51.2%, TiO221.6%) with a particle size of -0.074mm accounting for 60%, mixed with a binder, and then made 10-15mm pellets, dried at 200°C for 2 hours, roasted at 1100°C for 3 hours, then loaded into the shaft furnace, reduced in the shaft furnace at 1100°C for 4.5 hours, the reducing gas pressure is 0.3MPa, and the reducing gas is H2+CO ≈92%, the molar ratio of H2 to CO is 2.8. The direct reduction product is charged into an electric furnace for melting and separation. The melting temperature is 1650°C. The melting iron element analysis is TFe 94.8%, V2O50.2%, TiO 20.06%, and the melting slag element analysis is TFe 5%, V2O52.8 %, TiO254.4%. From vanadium-titanium magnetite concentrate to melting stage, the recovery rates of iron, vanadium, and titanium are 95%, 92%, and 99%, respectively.

Embodiment 2

[0040] Example 2: Vanadium-titanium magnetite concentrate (TFe 55.9%, FeO 22.8%, V2O50.53%, TiO211.8%) with a particle size of -0.074mm accounting for 75%, mixed with a binder, and then made 10-15mm pellets, dried at 200°C for 2 hours, roasted at 1100°C for 3 hours, then loaded into the shaft furnace, reduced in the shaft furnace at 1050°C for 5.5 hours, the reducing gas pressure is 0.2MPa, and the reducing gas is H2+CO ≈90%, the molar ratio of H2 to CO is 1.6. The direct reduction product is charged into an electric furnace for melting and separation. The melting temperature is 1550℃. The melting iron element analysis is TFe94%, V2O5 0.1%, TiO2 0.05%, and the melting slag element analysis is TFe 9%, V2O5 2.2%, TiO2 52.7% . From vanadium-titanium magnetite concentrate to melting stage, the recovery rates of iron, vanadium, and titanium are 97%, 91%, and 99%, respectively.

[0041] The beneficial effects of the present invention:

[0042] (1) For blast furnace smelting, titanium ...

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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 comprehensively utilizing vanadium-titanium magnetite, in particular to a method for comprehensively utilizing vanadium-titanium magnetite by shaft furnace reduction and electric furnace melting. Background technique [0002] Vanadium-titanium magnetite is a kind of compound symbiotic ore, mainly iron, vanadium, and titanium, accompanied by a small amount of chromium, gallium, platinum and other elements, which has a high comprehensive utilization value. The metallic minerals in the ore include titanomagnetite, ilmenite, magnetite, limonite, pyrrhotite, etc. The composition of the minerals is complex and it is difficult to comprehensively extract. [0003] For the processing and utilization of vanadium-titanium magnetite concentrates obtained after beneficiation, the main focus is on how to effectively recover iron, vanadium and titanium. Sintering-blast furnace-converter process is currently the main smelting method. W...

Claims

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Application Information

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Patent Type & Authority Patents(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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