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Method for reducing vanadium-titanium magnetite concentrate in tunnel kiln to obtain ferrite

A vanadium-titanium magnetite concentrate and tunnel kiln technology, applied in the field of metallurgy, can solve the problems of long reduction time, unsmooth feeding and discharging, difficult atmosphere and temperature control, etc. effect of time

Inactive Publication Date: 2013-02-06
毛耐文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pellet reduction equipment of this method has the following disadvantages: rings are easy to form during the reduction process of the rotary kiln, the atmosphere and temperature are difficult to control, and the reduction time is long; the temperature is difficult to reach the reduction temperature during the reduction process of the shaft furnace, and the reduction time is also long , the atmosphere is more difficult to control; in the reduction process of the rotary hearth furnace, the reduction time is short, the temperature is difficult to control, the material in and out is not smooth, and the scale is difficult to expand; the reduction tank used in the tunnel kiln has high energy consumption, long time and low output
Therefore, the reduction equipment of vanadium-titanium magnetite concentrate in the prior art has the disadvantages of long reduction time and unsmooth feeding and discharging.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Mix the vanadium-titanium magnetite concentrate with 5% by weight of calcareous quicklime and dry it, crush it to a particle size of less than 5mm, add 16% of the original ore weight of reduced coal and 7% of granular iron aggregating agent, mix evenly, and then put it in the tunnel kiln Spread a layer of coke powder 10mm evenly on the car, then pile 100mm of evenly mixed vanadium-titanium magnetite concentrate on the coke powder, and then cover a layer of coke powder 10mm on the top of the vanadium-titanium magnetite concentrate, and install the tunnel kiln trolley , then enter the tunnel kiln for reduction, the temperature is controlled at 1250 ° C, the reduction time is 8 hours, after reduction roasting, it is cooled by water quenching, crushed, ball milled, and then magnetically separated by a 1500 Gauss magnetic separator to obtain granular iron.

Embodiment 2

[0012] Mix the vanadium-titanium magnetite concentrate with 5% by weight of calcareous quicklime and dry it, crush it to a particle size of less than 5mm, add 20% of the original ore weight of reduced coal and 8% of granular iron aggregating agent, mix evenly, and then put it in the tunnel kiln Spread a layer of coke powder 11mm evenly on the car, and then pile evenly mixed vanadium-titanium magnetite concentrate 200mm on top of the coke powder, and then cover a layer of coke powder 15mm on the top of the vanadium-titanium magnetite concentrate, and install the tunnel kiln trolley , then enter the tunnel kiln for reduction, the temperature is controlled at 1350 ° C, the reduction time is 7 hours, after reduction roasting, it is cooled by water quenching, crushed, ball milled, and then magnetically separated by a 2500 Gauss magnetic separator to obtain granular iron.

Embodiment 3

[0014] Mix the vanadium-titanium magnetite concentrate with 6% by weight of magnesia quicklime and dry it, crush it to a particle size of less than 5mm, add 26% of the original ore weight of reduced coal and 6% of granular iron aggregating agent, mix evenly, and then put it in the tunnel kiln Spread a layer of coke powder 12mm evenly on the car, then pile evenly mixed vanadium-titanium magnetite concentrate 300mm on top of the coke powder, and then cover a layer of coke powder 20mm on the top of the vanadium-titanium magnetite concentrate, install the tunnel kiln trolley , then enter the tunnel kiln for reduction, the temperature is controlled at 1400°C, and the reduction time is 5 hours. After reduction and roasting, it is cooled by water quenching, crushed, ball milled, and then magnetically separated by a 2000 Gauss magnetic separator to obtain granular iron.

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Abstract

The invention relates to a method for reducing the vanadium-titanium magnetite concentrate in the tunnel kiln to obtain the ferrite, comprising the following steps: adding a desiccating agent into the vanadium-titanium magnetite concentrate, stirring and mixing uniformly, dehydrating and drying the vanadium-titanium magnetite concentrate, adding a reducing agent and a ferrite aggregating agent into the mixture, mixing uniformly, loading the mixture on a trolley in the tunnel kiln, covering a layer of coke powder o reduce and roast, quenching by water to cool, grinding, ball milling and dressing by magnetic separation to obtain the high-grade ferrite alloy. According to the method, the traditional reducing tank is not used. The method has the advantages of simple production, short reduction time, high yield, convenience of operation, energy consumption saving, low cost and high recovery of iron. The produced ferrite alloy can be directly used as the excellent raw materials for electrosmelting of steel.

Description

Technical field: [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for reducing granular iron in a tunnel kiln by using vanadium-titanium magnetite concentrate. Background technique: [0002] Vanadium-titanium magnetite concentrate is a compound paragenetic ore with a complex structure. At present, the utilization of vanadium-titanium magnetite concentrate is mainly blast furnace iron smelting to obtain molten iron, blowing vanadium through the converter to realize the separation of vanadium and iron and discarding the titanium-containing blast furnace slag; another utilization method of vanadium-titanium magnetite concentrate is vanadium-titanium After the magnetite concentrate is pelletized, after reduction, the pig iron is smelted in an electric furnace to obtain vanadium-containing molten iron and titanium slag, and the molten iron is shaken to extract vanadium, and then steelmaking. However, the pellet reduction equipment of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00B22F9/20
Inventor 毛黎生
Owner 毛耐文
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