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Device and method for optimizing iron ore through gas-based direct reduction magnetic separation

A direct, iron ore technology, applied in gas-based direct reduction roasting kilns and mineral selection, gas-based direct reduction magnetic separation to optimize the field of iron ore devices, and can solve difficult thermal control, furnace agglomeration, raw material shortage, etc. problems, to achieve the effect of precise and easy thermal control, reducing the emission environment, and solving the problem of scarcity

Pending Publication Date: 2021-11-23
张雷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Direct reduced iron is the best and indispensable residual element diluent for smelting high-quality steel; the existing direct reduction process generally requires the raw material of reduced iron to contain Fe>68.5%. Second, although the energy consumption of the existing gas-based shaft furnace reduction process is 355 kg / ton less than the 392 kg / ton energy consumption of blast furnace ironmaking, but the furnace is agglomerated, the material is not smooth, and the thermal process is difficult to control. Unstable operation has become the Achilles' heel of the existing gas-based shaft furnace reduction process, resulting in frequent setbacks in the industrial production and application of the gas-based shaft furnace process
In the sorting process after the roasting process, the sorting and screening process is often incomplete, resulting in low iron content in the final product

Method used

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  • Device and method for optimizing iron ore through gas-based direct reduction magnetic separation
  • Device and method for optimizing iron ore through gas-based direct reduction magnetic separation
  • Device and method for optimizing iron ore through gas-based direct reduction magnetic separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] An iron oxide ore contains Fe38.85%. Follow these steps:

[0069] ①Raw material treatment: crushing, screening, granulation, drying and screening of iron oxide ore containing 38.85% by weight of Fe to obtain iron ore particles of 3 to 40 mm in weight with a water content of less than 10%.

[0070] ②Gas-based direct reduction roasting: Roast 3-40mm iron ore granular materials in a gas-based direct reduction roasting test kiln. The pressure of the gas-based reducing gas hydrogen is controlled at 1000 Pa higher than the marked pressure, and the reduction temperature in the reduction section is controlled at 930°C Left and right, the speed of the material guide impeller is 5 revolutions per hour, and the material is discharged to obtain the roasted reduced material.

[0071] ③Cyclic grinding and magnetic separation: The obtained roasted and reduced materials are successively passed through a roller mill, a magnetic separator, a screening and extraction device, a Raymond mi...

Embodiment 2

[0075] An iron oxide ore contains Fe48.63%. Follow these steps:

[0076] ①Raw material treatment: Crushing, screening, granulating, drying and screening Fe48.63% iron oxide ore to obtain iron ore particles of 3 to 40 mm in weight percentage of moisture <10%.

[0077] ②Gas-based direct reduction roasting: Roast 3-40 mm iron ore granular materials in a gas-based direct reduction roasting test kiln. The gas-based reducing gas pressure is controlled at 1200 Pa higher than the marked pressure, and the reduction temperature in the reduction section is controlled at about 930 ° C. The rotating speed of the material guide impeller is 5 revolutions per hour, and the material is discharged to obtain the roasted reduced material.

[0078] ③Cyclic grinding and magnetic separation: The obtained roasted and reduced materials are successively passed through a roller mill, a magnetic separator, a screening and extraction device, a Raymond mill, a centrifugal extraction device, and a hoist, a...

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Abstract

The invention relates to the technical field of energy-saving comprehensive utilization of mineral resources, in particular to a device and method for optimizing iron ore through gas-based direct reduction magnetic separation. The device comprises a kiln body, wherein a roundabout snake-shaped flue is arranged in the kiln body from top to bottom, and the snake-shaped flue is divided into a preheating section, a heating section and a reduction section from top to bottom; a preheating material pool is arranged above the preheating section, the bottom of the preheating section is communicated with a blanking channel, and the blanking channel penetrates through the heating section and the reduction section and is isolated from the heating section and the reduction section; the bottom end of the blanking channel is communicated with an air cooling pipeline, and a reducing gas preheating reduction device is arranged in the air cooling pipeline; the bottom of the air cooling pipeline is connected with a circulating grinding system and a magnetic separation optimizing system. According to the method, a final optimized product is obtained through raw material treatment, gas-based direct reduction roasting and grinding magnetic separation optimization; and the problems of low reduction efficiency, long reduction heating time, a high heating temperature and poor heat preservation effect in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of energy-saving and comprehensive utilization of direct reduction of mineral resources, and relates to a gas-based direct reduction roasting kiln and a mineral optimization method; in particular, it relates to a gas-based direct reduction magnetic separation device and method for optimizing iron ore. Background technique [0002] Direct reduced iron is the best and indispensable residual element diluent for smelting high-quality steel; the existing direct reduction process generally requires the raw material of reduced iron to contain Fe>68.5%. Second, although the energy consumption of the existing gas-based shaft furnace reduction process is 355 kg / ton less than the 392 kg / ton energy consumption of blast furnace ironmaking, but the furnace is agglomerated, the material is not smooth, and the thermal process is difficult to control. Unstable operation has become the Achilles heel of the existing gas-bas...

Claims

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Application Information

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IPC IPC(8): C21B13/14B02C21/00B02C23/14B03C1/30B03C3/017C22B1/02F27D17/00
CPCC21B13/146C22B1/02B02C21/00B02C23/14B03C1/30B03C3/017F27D17/00
Inventor 张雷张凯玮张妍琪
Owner 张雷
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