A method for reducing emission of flue gas pollutants from high pyrite sintering

A high-pyrite ore and pollutant technology, applied in the field of flue gas pollutant emission reduction of high-pyrite ore sintering, can solve the problems of high concentration, sulfur enrichment, adverse effects of blast furnace ironmaking, etc., and achieve the reduction of free CaO content , Increase the sintering temperature and prolong the effect of high temperature time

Active Publication Date: 2015-10-21
CENT SOUTH UNIV
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  • Claims
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Problems solved by technology

Due to the sintering process of high pyrite ore, the SO in the flue gas emitted 2 High concentration, SO 2 It is easy to be adsorbed in sintered ore during the circulation process and lead to sulfur enrichment, which has a significant adverse effect on blast furnace ironmaking

Method used

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  • A method for reducing emission of flue gas pollutants from high pyrite sintering

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Experimental program
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Effect test

Embodiment 1

[0027] For the mixed iron ore with a sulfur content of 0.1%, quicklime accounting for 4% of the total mass of the sintering mixture is mixed in the batching process. The CaO content of the quicklime is 82% and the activity is 400ml; the nine-roller cloth is used to make the sintering machine The mass percentage of fuel in the surface material is 0.4% higher than that of the bottom material; the ignition intensity is 20% higher than that of conventional sintering during ignition, and the ignition temperature is 1200°C; the flue gas part of the tail wind box of the sintering machine will account for 1 / 3 of the length of the sintering machine Circulate to the surface of the sintered material, that is, SO at the tail of the sintering machine 2 The flue gas from the two wind boxes with the highest concentration is sent to the desulfurization system for desulfurization, and the flue gas from the remaining wind boxes at the tail is circulated to the fume hood on the sintering material...

Embodiment 2

[0029] For the mixed iron ore with a sulfur content of 0.3%, quicklime accounting for 6% of the total mass of the sintering mixture is mixed in the batching process. The CaO content of the quicklime is 88% and the activity is 550ml; the airflow distribution is used to make the surface of the sintering machine The mass percentage of fuel in the material is 0.8% higher than that of the bottom material; the ignition intensity is 30% higher than that of conventional sintering when ignited, and the ignition temperature is 1250°C; the flue gas of the tail bellows of the sintering machine, which accounts for 1 / 2 of the length of the sintering machine, is partially circulated To the surface of the sintered material, that is, the SO at the tail of the sintering machine 2 The flue gas from the three wind boxes with the highest concentration is sent to the desulfurization system for desulfurization, and the flue gas from the remaining wind boxes at the tail is circulated to the fume hood on...

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Abstract

The invention discloses a method for reducing emission of flue gas pollutants generated by sintering high sulfur containing pyrites. The method has the beneficial effects that by adopting a reasonable flue gas circulation mode, namely a flue gas circulation method of transmitting the flue gases in 2-3 air boxes with the highest SO2 concentrations in a tail air box of a sintering machine to a desulfurization system to be desulfurized and circulating the flue gases in the remaining air boxes at the tail of the machine to the surfaces of sintered materials, and combining the technology of adopting highly active quick lime to reinforce centralized release of SO2 in the sintering process and adopting high-strength ignition and segregation distribution to inhibit adsorption of SO2 in the circulation process, flue gas emission can be reduced by 25-40%, dust emission can be reduced by 20-35%, NOx can be reduced by 25-40%, dioxins can be reduced by 55-75% and CO can be reduced by 25-40% through flue gas circulation under the condition of not increasing the content of sulfur in the sinters.

Description

technical field [0001] The invention relates to a method for reducing emission of flue gas pollutants, in particular to a method for reducing emission of flue gas pollutants for sintering of high pyrite ore. Background technique [0002] Sinter is the main burden of blast furnace ironmaking, accounting for about 75% of the total iron-containing burden in my country. However, the sintering production not only has high energy consumption in the process, but also the flue gas emitted during the sintering process contains dust, COx, SOx, NOx, and highly carcinogenic substances such as dioxins and furans, and also emits various pollutants such as acid gases, heavy metals, and alkali metals. An important source of air pollution in the iron and steel industry. [0003] At present, there are many kinds of sintering flue gas purification technologies, but most of them are technologies that deal with single types of pollutants and high treatment costs. In order to reduce the cost of...

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邓琼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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