Method for strengthening sintering of high-proportion fine-grained material through multi-medium gas injection

A high-proportion, multi-media technology, applied in multi-media gas injection and optimized fuel composition to strengthen the sintering of high-proportion fine-grained materials, the sintering industry in the field of iron and steel metallurgy, can solve the problem of long burning time of fuel, heat dispersion and release, and impact Solve problems such as sinter output and quality indicators, achieve the effects of accelerated migration speed, balanced heat distribution, and improved heat supply shortage

Active Publication Date: 2020-12-04
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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  • Method for strengthening sintering of high-proportion fine-grained material through multi-medium gas injection
  • Method for strengthening sintering of high-proportion fine-grained material through 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 strengthening sintering of a high-proportion fine-grained material through multi-medium gas injection. The method comprises the following steps that uniform mixing, granulation, distribution, ignition and sintering are sequentially conducted on raw materials such as fine-grained iron ore, a fluxing agent, high-combustion-activity fuel, conventional fossil fueland return mines, and a mixed gas medium formed by fuel gas and water vapor is sprayed to the surface of a sintered material in the sintering process. According to the method, the permeability and thethermal state of a material layer are optimized by regulating and controlling the characteristic parameters and the addition proportion of the high-combustion-reaction-activity fuel and regulating and controlling the injection concentration and the coverage range of multi-medium gas and the relative volume percentage of fuel gas and water vapor in a coupling manner, so that the sintering of high-proportion fine-grained material is strengthened.

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 Applications(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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