Mechanical and chemical activation coupled refractory iron ore pelletizing energy conservation and emission reduction method

An energy saving and emission reduction, iron ore technology, applied in the field of refractory iron ore pretreatment, can solve problems such as poor roasting performance of refractory iron ore, and achieve the advantages of reducing energy consumption of pellets, increasing specific surface area and activity, and reducing energy consumption. Effect

Active Publication Date: 2020-06-19
CENT SOUTH UNIV
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Problems solved by technology

[0006] In view of the problem of poor roasting performance of refractory iron ore in the prior art and the shortcomings of high-pressure roller mills in the process of pretreatment of refractory iron ore, the purpose of the present invention is to provide a method that promotes refractory iron ore through the coupling of mechanical activation and chemical activation. High-efficiency activation of iron ore to realize pellet energy-saving roasting and emission reduction method. This method realizes low-temperature roasting of refractory iron ore through the joint action of mechanical activation and chemical activation, greatly reduces the energy consumption of pellets, and reduces COx and SOx from the source , NOx emissions, especially to achieve low NOx production of refractory iron ore

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  • Mechanical and chemical activation coupled refractory iron ore pelletizing energy conservation and emission reduction method

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Embodiment 1

[0031] For the specularite in Table 1, adding 1.0% CaO content to the specularite is 54.2% limestone, the content of limestone less than 0.045mm is 80%, the content less than 0.02mm is 33%, and the moisture of limestone is controlled at 7.5%, after the limestone is added to the specularite, it is mixed with a horizontal strong mixer with coulter-type stirring blades, the stirring speed is 4r / min, and then high-pressure roller milling under the conditions of 2.5MPa and 7.5% moisture, The grate-rotary kiln is used for roasting, the temperature rise rate of the grate preheating stage I is controlled to be 100°C / min, and the decomposition ratio of limestone before entering the roasting reaches 90%. Compared with the conventional pellet preparation and sintering process of Example 1, the optimal pellet calcination temperature can be reduced to 1260°C, the pellet strength can be increased to 2678N / piece, the energy consumption can be reduced by 19%, and the SO 2 22% reduction in emi...

Embodiment 2

[0033]For the specularite in Table 1, adding 1.5% CaO content to the specularite is 54.2% limestone, the content of limestone less than 0.045mm is 80%, the content less than 0.02mm is 33%, and the moisture of limestone is controlled at 7.0%, after the limestone is added to the specular iron ore, it is mixed with a horizontal strong mixer with a plow-type stirring blade, and the stirring speed is 6r / min, and then high-pressure roller milling under the conditions of 3.2MPa and 7.0% moisture, The grate-rotary kiln is used for roasting, the temperature rise rate of the grate preheating stage I is controlled to be 70°C / min, and the decomposition ratio of limestone before entering the roasting reaches 93%. Compared with the conventional pellet preparation and sintering process of Example 1, the optimal pellet calcination temperature can be reduced to 1240°C, the pellet strength can be increased to 2712N / piece, the energy consumption can be reduced by 25%, and the SO 2 30% reduction ...

Embodiment 3

[0035] For the hematite in Table 1, add 0.5% CaO to the hematite and add limestone with a content of 54.2%. The content of limestone less than 0.045mm is 80%, and the content less than 0.02mm is 33%. The moisture content of limestone is controlled at 7.0%, after limestone is added to hematite, it is mixed with a horizontal strong mixer with coulter-type stirring blades, and the stirring speed is 5r / min, and then high-pressure roller milling under the conditions of 2.5MPa and 6.5% moisture, The grate-rotary kiln is used for roasting, the temperature rise rate of the grate preheating stage I is controlled to be 85°C / min, and the decomposition ratio of limestone before entering the roasting reaches 92%. Compared with the conventional pellet preparation and sintering process in Example 1, the optimal pellet calcination temperature can be reduced from 1320°C to 1260°C, the strength of pellets can be increased from 2521N / piece to 2895N / piece, and the energy consumption can be reduced...

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Abstract

The invention discloses a mechanical and chemical activation coupled refractory iron ore pelletizing energy conservation and emission reduction method. In the pelletizing preparation process of refractory iron ore concentrates, refractory iron ores and limestone are forcibly and evenly mixed and then are subjected to high-pressure roller grinding pretreatment. According to the method provided by the invention, the mechanical activation effect of high-pressure roller grinding and the chemical activation effect of limestone are coupled to jointly promote solidification reaction of the refractoryiron ores, so that the calcination temperature of refractory iron ore pelletizing feed is lowered by 60-100 DEG C, the pellet strength is improved by 300-600 N or more, energy consumption is reducedby 10%-25%, emission of SO2 is reduced by 12-30%, and emission of NOx is reduced by 25%-52%.

Description

technical field [0001] The present invention relates to a method for pretreatment of refractory iron ore, in particular to a method for promoting refractory iron ore crystal lattice activation by coupling a chemical activator with a high-pressure roller mill, thereby reducing the roasting temperature of refractory iron ore and realizing refractory iron ore pellets A method for energy saving and emission reduction in the preparation process belongs to the field of iron ore pellet preparation in iron and steel metallurgy. Background technique [0002] As a main iron-containing charge for blast furnace ironmaking, pellets have the advantages of uniform particle size, good compressive strength, high iron grade, and good metallurgical properties. And compared with sinter, pellet production is relatively friendly to the environment and has a higher heat utilization rate. Therefore, steel mills in various countries prefer pellets in the selection of blast furnace charge. So far, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/02
CPCC22B1/02C22B1/2406
Inventor 范晓慧甘敏陈许玲季志云孙伟黄晓贤高志勇袁礼顺汪国靖王殊
Owner CENT SOUTH UNIV
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