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Method for comprehensively utilizing vanadium titano-magnetite by melting and separating through reduction-fuel smelting furnace of rotary hearth furnace

A vanadium-titanium magnetite and gas-fired smelting furnace technology, applied in the direction of rotary drum furnaces, furnaces, furnace types, etc., can solve the problems of high carbon content, poor slag fluidity, high energy consumption, etc., to achieve low carbon content, lighten Effect of smelting burden and enhanced degassing effect

Active Publication Date: 2012-09-26
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the slag content (FeO) is low, the fluidity of the slag is not good, and it is necessary to further increase the temperature of the molten pool to ensure the fluidity of the slag, resulting in relatively high energy consumption. The energy consumption per ton of vanadium-containing molten iron in this process is higher than that of the traditional one blast furnace process
There is re-oxidation of direct reduced iron in the melting process of electric furnace, and the reduction atmosphere is maintained by external carbon addition, which will lead to high carbon content in molten iron, but there is no such situation in gas-fired smelting furnace

Method used

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  • Method for comprehensively utilizing vanadium titano-magnetite by melting and separating through reduction-fuel smelting furnace of rotary hearth furnace
  • Method for comprehensively utilizing vanadium titano-magnetite by melting and separating through reduction-fuel smelting furnace of rotary hearth furnace

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Embodiment 1

[0047] Composition of vanadium-titanium magnetite: TFe 59.28%, TiO 2 9.14%, V 2 o 5 0.47%. More than 100 mesh accounted for 90%, using anthracite below 1mm, of which 75.34% fixed carbon, 10.94% ash, 12.5% ​​volatile matter, 0.45% total sulfur. The material ratio is: vanadium-titanium ore: pulverized coal: binder = 100:24:6. After mixing evenly, use a double-roller briquetting machine to make pellets. After drying, the pellets enter the bottom of the rotary hearth furnace through a distribution machine. Double-layer distribution, the thickness is about 24mm. The reduction temperature in the furnace is between 1200 and 1350°C, and the holding time at 1350°C is about 17 minutes, and the whole reduction process takes 39 minutes. The metallization rate after pre-reduction in the rotary hearth furnace is >88%, and the hot cans enter the gas melting furnace. The temperature of the gas furnace is 1450~1620 ° C, and the melting time is 60 minutes. After smelting, the titanium slag...

Embodiment 2

[0049] Vanadium-titanium magnetite composition: TFe 54.45%, TiO 2 16.24%, V 2 o 5 1.02%. More than 200 mesh accounted for 40%, using anthracite below 1mm, of which 75.34% fixed carbon, 10.94% ash, 12.5% ​​volatile matter, 0.45% total sulfur. The material ratio is: vanadium-titanium ore: pulverized coal: binder = 100:24:6. After mixing evenly, use a double-roller briquetting machine to make pellets. After drying, the pellets enter the bottom of the rotary hearth furnace through a distribution machine. Double-layer distribution, the thickness is about 24mm. The reduction temperature in the furnace is between 1150 and 1350°C, and the holding time at 1350°C is about 17 minutes, and the whole reduction process takes 39 minutes. The metallization rate after pre-reduction in the rotary hearth furnace is >90%, and the hot cans enter the gas melting furnace. The temperature of the gas furnace is 1450~1600 ° C, and the melting time is 60 minutes. After smelting, the titanium slag a...

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Abstract

The invention discloses a method for comprehensively utilizing vanadium titano-magnetite by melting and separating through a reduction-fuel smelting furnace of a rotary hearth furnace, comprising the following steps of: firstly, uniformly mixing the vanadium titano-magnetite, reduced coal and a bonding agent and pressing into a pellet; drying the pellet and filling into the rotary hearth furnace to be heated to be at 1150-1350 DEG C, and reducing for 30-40 minutes; directly conveying an obtained high-temperature metallized pellet into a heat accumulating type fuel melting furnace in which coal-derived gas is taken as fuel for melting and separating; controlling the temperature of the fuel melting furnace to be at 1500-1620 DEG C to obtain liquid iron containing vanadium and titanium slag; producing titanium dioxide powder by taking the titanium slag as a raw material or producing a titanium-enriched material through using a flotation process; conveying the liquid iron containing the vanadium into a converter to blow oxygen to obtain vanadium slag and semi-steel; and removing the vanadium slag and continually smelting the semi-steel into steel liquid. The method takes the coal-derived gas with a low calorific value as motive power for the melting and the separating of the heat accumulating type fuel melting furnace so as to combine a coal-derived gas procedure and a melting and separating procedure; blast furnace gas and coal-derived natural gas which have the low calorific value can be used; and the carbon content of the liquid iron containing the vanadium obtained by the melting and the separation of the fuel furnace is very low and the purity is very high.

Description

technical field [0001] The invention relates to a method for smelting vanadium-titanium magnetite, in particular to a method for comprehensive utilization of vanadium-titanium magnetite by rotary hearth furnace reduction-gas smelting furnace smelting. Background technique [0002] Vanadium-titanium magnetite is magnetite (Fe 3 o 4 )-titanium iron spar (2FeO·TiO 2 )-magnesium aluminum spinel (MgO·Al 2 o 3 )-Ilmenite (FeO·TiO 2 ) in a closely symbiotic complex. Vanadium-titanium magnetite is rich in iron, vanadium, titanium and other valuable elements, and has extremely high utilization value. Countries in the world that comprehensively utilize, develop and industrialize vanadium-titanium magnetite resources mainly include South Africa, Russia, New Zealand and China, among which South Africa and New Zealand adopt the rotary kiln-electric furnace process, mainly recovering Fe and V. In the blast furnace-converter process used in China and Russia, the recovery effect of T...

Claims

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Application Information

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IPC IPC(8): C21B13/08C22B1/24C21C5/28
CPCY02P10/143
Inventor 吴道洪古明远曹志成
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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