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A method for intensifying sintering of high-proportion fine-grained materials by multi-medium gas injection

A high-proportion, multi-media technology, which is used in multi-media gas injection and optimization of fuel composition to strengthen the sintering of high-proportion fine-grained materials. Quality indicators, heat dispersion and release, etc., to achieve the effect of accelerating migration speed, improving insufficient heat supply and balanced heat distribution

Active Publication Date: 2021-11-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the use of high proportion of fine-grained materials (fine-grained iron ore, iron-containing dust) in the prior art, it is easy to cause conventional fossil fuel particles to be tightly wrapped by fine-grained materials, which makes the fuel burn for a long time and the heat is dispersed and released , thereby affecting the sinter output and quality indicators. The main purpose of the present invention is to provide a method of improving the gas permeability and thermal state of the material layer by injecting multi-media gas and optimizing the fuel characteristics of the fuel in the material layer, thereby A method to strengthen the sintering of high-proportion fine-grained materials, which can significantly increase sintering output, quality index, utilization factor and reduce sintering solid fuel consumption

Method used

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  • A method for intensifying sintering of high-proportion fine-grained materials by multi-medium gas injection
  • A method for intensifying sintering of high-proportion fine-grained materials by multi-medium gas injection

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Effect test

Embodiment 1

[0034] Iron ore, gas ash (characteristic parameters such as Table 4), quicklime, dolomite, straw charcoal, coke powder, and returned ore are 65%, 3%, 6%, 2%, 1%, 3%, 20% by mass percentage % for batching, wherein the fine-grained iron ore and gas ash accounted for 80% of the total mass of iron ore and gas ash, the particle size composition of fine-grained iron ore and the physical and chemical characteristics of straw charcoal are shown in Table 1 and Table 2 respectively ;Use a strong mixer and a cylinder mixer to mix and granulate the materials, and then distribute the granulated mixture on the sintering machine trolley; the mixture is ignited at a temperature of 1050±50°C for 1min, Keep warm for 1min, sintering negative pressure 15kPa, after ignition and heat preservation, inject a mixed gas medium composed of gas and water vapor into the material surface through the gas medium injection pipe added on the sintering material surface, in which the volume percentage of coke ove...

Embodiment 2

[0036] Iron ore, gas ash (characteristic parameters such as Table 4), quicklime, dolomite, straw charcoal, coke powder, and returned ore are 65%, 3%, 6%, 2%, 1.5%, 2.5%, 20% by mass percentage % for batching, wherein the fine-grained iron ore and gas ash accounted for 80% of the total mass of iron ore and gas ash, the particle size composition of fine-grained iron ore and the physical and chemical characteristics of straw charcoal are shown in Table 1 and Table 2 respectively ;Use a strong mixer and a cylinder mixer to mix and granulate the materials, and then distribute the granulated mixture on the sintering machine trolley; the mixture is ignited at a temperature of 1050±50°C for 1min, Keep warm for 1min, sintering negative pressure 15kPa, after ignition and heat preservation, inject a mixed gas medium composed of gas and water vapor into the material surface through the gas medium injection pipe added on the sintering material surface, in which the volume percentage of coke...

Embodiment 3

[0038] Iron ore, gas ash (characteristic parameters such as Table 4), quicklime, dolomite, straw charcoal, coke powder, and returned ore are 65%, 3%, 6%, 2%, 2%, 2%, 20% by mass percentage % for batching, wherein the fine-grained iron ore and gas ash accounted for 80% of the total mass of iron ore and gas ash, the particle size composition of fine-grained iron ore and the physical and chemical characteristics of straw charcoal are shown in Table 1 and Table 2 respectively ;Use a strong mixer and a cylinder mixer to mix and granulate the materials, and then distribute the granulated mixture on the sintering machine trolley; the mixture is ignited at a temperature of 1050±50°C for 1min, Keep warm for 1min, sintering negative pressure 15kPa, after ignition and heat preservation, inject a mixed gas medium composed of gas and water vapor into the material surface through the gas medium injection pipe added on the sintering material surface, in which the volume percentage of coke ove...

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Abstract

The invention discloses a method for intensifying the sintering of high-proportion fine-grained materials by multi-medium gas injection. The method involves mixing, granulating, distributing, igniting and sintering raw materials such as fine-grained iron ore, flux, high-combustion active fuel, conventional fossil fuels and ore returns in sequence, and spraying into the sintering material surface during sintering Mixed gas medium composed of gas and water vapor. This method optimizes the gas permeability and thermal state of the material layer by adjusting the characteristic parameters and proportion of fuel with high combustion reactivity, coupled with the adjustment of the concentration of multi-medium gas injection, the coverage area, and the relative volume percentage of gas and water vapor, so as to achieve high Intensification of proportional fine-grained material sintering.

Description

technical field [0001] The invention relates to a method for sintering high-proportion fine-grained materials, in particular to a method for strengthening sintering of high-proportion fine-grained materials by multi-media gas injection and optimizing fuel composition, and belongs to the sintering industry in the field of iron and steel metallurgy. Background technique [0002] Since my country's crude steel output exceeded 100 million tons for the first time in 1996, it has continued to rank first in the world. In 2019, the crude steel output reached 996 million tons. In order to support the huge steel production capacity, my country imports a large proportion of iron ore from Australia, Brazil, South Africa and other iron ore exporting countries. For Baosteel, Wuhan Iron and Steel, Shougang, Hunan Iron and Steel and other coastal and riverside iron and steel enterprises, due to the advantage of low transportation costs, a high proportion of imported iron ore can be used for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 季志云范晓慧甘敏陈许玲黄斌斌武钰丰黄晓贤孙增清袁礼顺李浩锐
Owner CENT SOUTH UNIV
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