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Method for enhancing sintering of high-proportion limonite by utilization of waste heat of exhaust gas

A limonite, high-proportion technology, applied in the field of limonite sintering, can solve the problems of insignificant reduction of water evaporation and heat absorption, increase of sintering processing cost, and increase of high-temperature process, so as to improve quality indicators and reduce sintering energy consumption , The effect of reducing heat expenditure

Active Publication Date: 2014-01-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology increases the processing cost of sintering due to the increase of high-temperature process, and after limonite is dehydrated in advance, due to its high porosity, it absorbs water fully in the subsequent granulation process, so the reduction of water evaporation and heat absorption is not obvious, improving The effect of sintering is not ideal

Method used

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  • Method for enhancing sintering of high-proportion limonite by utilization of waste heat of exhaust gas
  • Method for enhancing sintering of high-proportion limonite by utilization of waste heat of exhaust gas
  • Method for enhancing sintering of high-proportion limonite by utilization of waste heat of exhaust gas

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Experimental program
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Effect test

Embodiment 1

[0023] Four kinds of limonites are added into the sintered material, and the chemical compositions of various limonites are shown in Table 1. When the total amount of limonite accounts for 50% of the total amount of iron ore, the proportions of various limonites are shown in Table 2, ore blending scheme 1, and the chemical composition of the produced sinter is TFe58.5%, R1.7, SiO 2 4.9%, MgO1.5%. After the mixture is distributed and sintered and ignited, a sealed fume hood is added, and high-temperature exhaust gas is introduced to heat the mixture to remove the crystal water and free water in the mixture on the surface of the material layer. The high-temperature exhaust gas comes from the ring cooler I For the cooling exhaust gas of Section or Section II, the position of the fume hood is located at the head of the sintering machine, between the distribution device and the ignition fume hood. It can be seen from Table 2 that in the range where the hot air temperature is 300-...

Embodiment 2

[0025] Four kinds of limonites are added into the sintered material, and the chemical compositions of various limonites are shown in Table 1. When the total amount of limonite accounts for 70% of the total amount of iron ore, the proportions of various limonites are shown in Table 3, ore blending scheme 2, and the chemical composition of the produced sinter is TFe57.3%, R1.9, SiO 2 5.0%, MgO2.0%. After the mixture is distributed and sintered and ignited, a sealed fume hood is added, and high-temperature exhaust gas is introduced to heat the mixture, remove the crystal water and free water in the mixture on the surface of the material layer, and the high-temperature exhaust gas is extracted from the tail of the sintering machine for the last 1- High temperature flue gas from 2 bellows, the position of the hood is located at the head of the sintering machine, between the distribution device and the ignition hood. It can be seen from Table 3 that the use of waste gas waste heat...

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Abstract

The invention discloses a method for enhancing the sintering of high-proportion limonite by the utilization of waste heat of exhaust gas. According to the high-proportion limonite, limonite accounts for 50-70% of the total mass of iron ore, the content of crystal water in the limonite is 5-15%, after distribution of a mixture and before sintering ignition, a sealed smoke hood is additionally arranged, high temperature exhaust gas from a sintering ring cooler or high temperature exhaust gas at the tail portion of a sintering machine is guided in to be used for heating the mixture, crystal water and free water in the mixture at the surface layer of a bed of material are removed, thermal decomposition of the crystal water of the material on the surface layer in the sintering process and thermal emission of evaporation of water are reduced, the sintering temperature of the surface layer of the bed of material is increased, accordingly, the sintering yield and quality index of the high-proportion limonite are improved, and energy consumption for sintering is reduced.

Description

technical field [0001] The invention relates to a method for sintering limonite, in particular to a method for using high-temperature waste gas to heat a mixture to strengthen the sintering of limonite with a high proportion. Background technique [0002] Iron ore sintering is the first process of iron and steel production, and the concentrate it provides is the basis for high-quality, high-yield, and low-consumption steel production. my country's high-quality iron ore resources are increasingly in short supply, and with the rapid development of the iron and steel industry, the quality of raw materials used in iron and steel production has become increasingly poor and complex, and the varieties have become increasingly complex. In order to alleviate the shortage of resource supply and reduce the cost of sintering raw materials, more and more iron and steel enterprises have to use more and more inferior iron ore resources, especially the limonite with large resources, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
Inventor 范晓慧甘敏姜涛陈许玲李光辉袁礼顺余志元季志云陈强吕薇黄柱成郭宇峰杨永斌张元波李骞白国华许斌尹亮王海波
Owner CENT SOUTH UNIV
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