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A method for making blast furnace charge from iron ore powder

A technology of iron ore powder and blast furnace, which is applied in the field of metallurgy, can solve the problems of fine-grained ore return, dust and exhaust gas emissions, and difficulty in adapting to high-quality iron ore resources, so as to avoid negative impacts and reduce pollutants and exhaust gas emissions.

Active Publication Date: 2021-05-25
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the large amount of dust and waste gas emissions generated by the ventilation process, and a large amount of fine particles returned to the ore during the production process, the production efficiency is not high
However, the pelletizing method has high requirements on raw material quality and particle size, and it is difficult to adapt to the current situation of decreasing high-quality iron ore resources and diverse sources of iron ore resources.

Method used

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  • A method for making blast furnace charge from iron ore powder

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Comparison scheme
Effect test

Embodiment 1

[0042] A single type of magnetic fine powder of -0.15mm is used as fine-grained iron ore powder, a single type of iron ore particle of +1mm is used as coarse-grained iron ore powder, and limestone of -1mm is used as flux. All materials are expressed in terms of dry basis mass percentage. Mix 31.7% fine-grained iron ore powder with 13.0% flux, dry it, and melt it at 1500°C to form a liquid phase with a binary alkalinity of 4.0; mix the obtained liquid phase with 55.3% coarse-grained iron ore powder, and cool , crushing and sieving to obtain a charge with a binary alkalinity of 2.0.

Embodiment 2

[0044] -1mm single iron ore powder is used as fine iron ore powder, +1mm mixed iron ore particles are used as coarse iron ore powder, -1mm quicklime and limestone mixture is used as flux, all materials are based on dry basis mass percentage express. Mix 24.5% fine-grained iron ore powder with 13.5% flux, dry it, and melt it at 1400°C to form a liquid phase with a binary alkalinity of 6.0; mix the obtained liquid phase with 62.0% coarse-grained iron ore powder, and cool , crushing and sieving to obtain a charge with a binary alkalinity of 2.0.

Embodiment 3

[0046] -1mm mixed iron ore powder is used as fine-grained iron ore powder, +1mm mixed iron ore particles are used as coarse-grained iron ore powder, and -1mm quicklime is used as flux. All materials are expressed in terms of dry basis mass percentage. Mix 27.1% fine-grained iron ore powder with 5.7% flux, dry it, and melt it at 1400°C to form a liquid phase with a binary alkalinity of 4.0; mix the obtained liquid phase with 67.2% coarse-grained iron ore powder, and cool , After crushing and sieving, the charge with a binary alkalinity of 1.3 is obtained.

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Abstract

The invention relates to a method for making blast furnace charge from iron ore powder, belonging to the technical field of metallurgy, comprising: dividing the iron ore powder to be agglomerated into fine-grained iron ore powder and coarse-grained iron ore powder according to the particle size; The fine-grained iron ore powder is mixed with a flux and dried to obtain an iron ore powder mixture; the iron ore powder mixture is melted to obtain a liquid phase mixture, and the melting temperature is 1300-1500°C; the liquid phase mixture is mixed with The coarse iron ore powder is mixed, cooled, crushed and sieved to obtain blast furnace charge.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for making blast furnace charge from iron ore powder. Background technique [0002] Iron and steel metallurgy is mainly based on the blast furnace smelting method, and the raw materials used in the blast furnace need to be agglomerated in advance to make the raw materials have a certain particle size, so as to ensure the smooth progress of the blast furnace smelting process. Commonly used agglomeration methods are mainly sintering and pelletizing. The sintering method first ignites the mixed material of iron ore powder, flux, fuel, etc. on the sintering machine, and then sinters the material downward by means of ventilation, and obtains sintered ore after cooling and crushing. In the pelletizing method, fine iron ore powder, binder, etc. are pelletized on a pelletizing disk, and then pellets are obtained after high-temperature roasting and cooling. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00
CPCC21B5/00C21B5/008
Inventor 马怀营赵志星潘文辛越欧书海张志东王春来梁宏义刘磊宋福亮李永欣赵俊花
Owner SHOUGANG CORPORATION