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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: 2015-04-08
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 were mixed 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 proportion of various limonites is shown in the ore blending scheme 1 of Table 2, and the chemical composition of the produced sinter is TFe58.5%, R1.7, SiO 2 4.9%, MgO1.5%. After the mixture is laid out and before sintering and ignition, a sealed fume hood is added to introduce high-temperature waste gas to heat the mixture and remove crystal water and free water in the mixture on the surface of the material layer. The high-temperature waste gas comes from the ring cooler Ⅰ 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 when the hot air temperature is 300-500°C and the prehea...

Embodiment 2

[0025] Four kinds of limonites were mixed 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 proportion of various limonites is shown in the ore blending scheme 2 of Table 3, and the chemical composition of the produced sinter is TFe57.3%, R1.9, SiO 2 5.0%, MgO2.0%. After the mixture is laid out and before sintering and ignition, add a sealed fume hood to introduce high-temperature waste gas to heat the mixture, remove crystal water and free water in the mixture on the surface layer of the material layer, and extract the high-temperature waste gas from the last 1~ of the tail of the sintering machine. The high-temperature flue gas from the two bellows, the position of the fume hood is located at the head of the sintering machine, between the material distribution device and the ignition fume hood. It can be seen from Table 3 that the produ...

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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 the mixture to strengthen the sintering of high-proportion limonite. Background technique [0002] Iron ore sintering is the first process of iron and steel production, and the concentrate it provides is the basis for iron and steel production to achieve high quality, high yield and low consumption. my country's high-quality iron ore resources are increasingly scarce, and with the rapid development of the iron and steel industry, the quality of raw materials used in iron and steel production is becoming poorer and more complex. In order to alleviate the tight supply of resources and reduce the cost of sintering raw materials, more and more iron and steel enterprises have to use more and more low-quality iron ore resources, especially limonite with a large amount of resources. Many manufacturers use more and more higher. [...

Claims

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Application Information

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Patent Type & Authority Patents(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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