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Method and device for optimizing iron ore through gas-coal double-base direct reduction magnetic separation

A gas-coal and iron ore technology, applied in the field of energy-saving and comprehensive utilization of direct reduction of mineral resources, can solve the problem that natural raw materials are difficult to meet the needs of large-scale production of direct reduction iron raw materials, the frustration of industrial production and application of gas-based shaft furnace technology, sorting and screening treatment Incomplete and other problems, achieve significant removal effect, improve quality structure and energy structure, and be easy to promote

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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  • Method and device for optimizing iron ore through gas-coal double-base direct reduction magnetic separation
  • Method and device for optimizing iron ore through gas-coal double-base direct reduction magnetic separation
  • Method and device for optimizing iron ore through gas-coal double-base direct reduction magnetic separation

Examples

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Effect test

Embodiment 1

[0104] A certain iron oxide ore contains Fe42.87% (weight percentage). Follow these steps:

[0105] ①Raw material treatment: The iron oxide ore Fe42.87% raw material and reducing agent coal were sieved, granulated, dried and screened to obtain iron oxide ore particles with a particle size of 3-40 mm and coal particles with a particle size of 5-10 mm. Mix 10mm coal particles at a ratio of 8%, and a particle size of 1-5mm, and then use coal particles at a ratio of 6% and 3-40mm iron oxide particles to obtain a mixed material, and the water content of the mixed material is less than 10%.

[0106] ②Gas-coal double-base direct reduction roasting: roast the mixture of 3-40mm iron oxide ore particles in the gas-coal double-base direct reduction roasting test kiln, the gas-base reduction gas pressure is controlled at 1000Pa higher than the marked pressure, and the reduction temperature in the reduction section The temperature is controlled at about 930°C, and the rotating speed of th...

Embodiment 2

[0112] An iron ore contains Fe48.63% (weight percentage). Follow these steps:

[0113] ①Raw material treatment: The iron oxide ore Fe48.63% raw material and reducing agent coal were sieved, granulated, dried and screened to obtain iron ore particles with a particle size of 3-40 mm and coal particles with a particle size of 5-10 mm. 8% of coal particles in millimeters, 1-5mm in particle size, and 6% of recycled coal particles in proportion to 3-40mm iron oxide particles are mixed to obtain a mixed material, and the weight percentage of the mixed material is less than 10%.

[0114] ②Gas-coal double-base direct reduction roasting: Roast 3-40 mm iron oxide ore pellet mixture in the gas-coal double-base direct reduction roasting test kiln. The reduction temperature is controlled at about 930°C, and the rotation speed of the material guide impeller is about 6 revolutions per hour, so as to obtain roasted reduced materials.

[0115] ③Coal separation and reuse: The obtained roasted ...

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Abstract

The invention relates to the technical field of energy-saving comprehensive utilization of mineral resources, and particularly relates to a method and device for optimizing an iron ore through gas-coal double-base direct reduction magnetic separation. The method specifically comprises the steps: carrying out raw material treatment; carrying out reduction roasting on a material and reduction coal mixture by using a gas-coal double-base direct reduction roasting kiln; cooling an iron ore particle material subjected to reduction roasting; and sequentially treating by a coal separation recycling system, a double-roller grinding system, a Raymond grinding system and a magnetic separation optimization system to obtain optimized fine iron powder, wherein the grade Fe of the optimized fine iron powder is greater than 78%. The invention solves the problems of low reduction efficiency, long reduction heating time, high heating temperature and poor heat preservation effect in the prior art.

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 roasting kiln for double-base direct reduction of gas-coal and a mineral optimization method; in particular, it relates to a method and device for optimizing iron ore by magnetic separation of double-base direct reduction of gas-coal. 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...

Claims

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Application Information

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IPC IPC(8): C21B13/14C22B1/02B02C21/00B02C23/14B03C1/30B03C3/017F27D17/00
CPCC21B13/146C21B13/0046C21B13/0073C22B1/02B02C21/00B02C23/14B03C1/30B03C3/017F27D17/00
Inventor 张雷张凯玮张妍琪
Owner 张雷
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