A method for improving the pulverization rate of low-temperature reduction of sintered ore

A technology of pulverization rate and sintering ore, which is applied in the field of improving the reduction pulverization rate of sintering ore, can solve problems such as reducing production costs, and achieve the effects of reducing production costs, prolonging sintering time, and improving metallurgical performance indicators

Active Publication Date: 2018-08-31
ANGANG STEEL CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The air permeability of the material layer is improved, thereby reducing the probability of crystal transformation of the sinter in the lower part of the material layer during cooling, reducing the formation of glass phases, improving the quality of the sintered ore, and thus improving the low-temperature reduction powder of the sintered ore. The melting rate can solve the problems of over-melting or hard shell, and the decrease of air permeability. At the same time, it can also save coke powder resources and reduce production costs.

Method used

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  • A method for improving the pulverization rate of low-temperature reduction of sintered ore
  • A method for improving the pulverization rate of low-temperature reduction of sintered ore
  • A method for improving the pulverization rate of low-temperature reduction of sintered ore

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Embodiment 1

[0017] The mass percentage is 78% of magnetite and 19% of flux (8% of quicklime, 1.9% of limestone, 2% of magnesium stone) and 1.86% of coke powder (solid fuel is 3%, of which coking and dust removal 38% of the solid fuel, and coke powder accounts for 62% of the solid fuel) are mixed, and then the mixed material is sieved according to three particle size levels of 5mm. Mix the sieved mixture 3 / h; after the mixture is sprayed with coking dust and atomized water, the mass percentage of water is controlled at 7.2%. When distributing materials, arrange the sintered mixture with a particle size of >5mm at the bottom of the material layer, arrange the mixture with an original particle size of 3mm-5mm and added coking dust in the middle of the material layer, and place the original particle size at the middle of the material layer. The mixed material with a diameter of <3 mm and added with coking and dedusting ash is arranged on the uppermost part of the material layer, and finally ...

Embodiment 2

[0022] The mass percentage is 80% hematite and 15.5% flux (6% quicklime, 8% limestone, 1.5% magnesite) and 3.285% coke powder (solid fuel is 4.5%, wherein coking dedusting ash accounts for 27% of the solid fuel, coke powder accounts for 73% of the solid fuel) are mixed, and then the mixed material is sieved according to three particle size levels of 5mm. Mix the sieved mixture 3 / h; after the mixture is sprayed with coking dust and atomized water, the mass percentage of water is controlled at 7.7%. When distributing materials, arrange the sintered mixture with a particle size of >5mm at the bottom of the material layer, arrange the mixture with an original particle size of 3mm-5mm and added coking dust in the middle of the material layer, and place the original particle size at the middle of the material layer. The mixed material with a diameter of <3 mm and added with coking and dedusting ash is arranged on the uppermost part of the material layer, and finally sintered to obt...

Embodiment 3

[0027]The mass percentage is 84% ​​limonite and 10.6% flux (3% quicklime, 5.5% limestone, 1.0% magnesite) and 5.2% coke powder (solid fuel is 6.5%, wherein coking dedusting ash accounts for 20% of the solid fuel, and coke powder accounts for 80% of the solid fuel) are mixed, and then the mixed material is sieved according to three particle size levels of 5mm. Mix the sieved mixture 3 / h; after the mixture is sprayed with coking dust and atomized water, the mass percentage of water is controlled at 7.5%. When distributing materials, arrange the sintered mixture with a particle size of >5mm at the bottom of the material layer, arrange the mixture with an original particle size of 3mm-5mm and added coking dust in the middle of the material layer, and place the original particle size at the middle of the material layer. The mixed material with a diameter of <3 mm and added with coking and dedusting ash is arranged on the uppermost part of the material layer, and finally sintered t...

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Abstract

The invention discloses a method for improving low-temperature reduction powdering rate of sintered ores. Sintering raw materials are an iron-bearing mineral, a fusing agent and solid fuel. The method comprises the steps that firstly the iron-bearing mineral, the fusing agent and the coke powder are mixed, the mixture is screened respectively according to the three granularity levels of below 3 mm, 3-5 mm and above 5 mm, the mixture with the granularity level above 5 mm is put at the bottommost end of a material layer on a sintering trolley, the mixture with the granularity level of 3-5 mm and added with coking fly ash is put in the middle of the material layer on the sintering trolley, and the mixture with the granularity level below 3 mm and added with coking fly ash is put on the upmost portion of the material layer on the sintering trolley. The problem that the coking fly ash does not easily form sphere kernels and is difficult to adsorb is overcome, a large number of by-products of a coking plant are used, accordingly coke powder resources are saved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of raw material production for ironmaking, relates to the production technology of sintered ore, and in particular relates to a method for improving the reduction pulverization rate of sintered ore. Background technique [0002] The low-temperature reduction pulverization index of sinter is an important indicator for assessing the quality of sinter, which directly affects the production quality of blast furnaces. According to a large number of studies, the most fundamental reason for low-temperature reduction pulverization of sinter is the recycled Fe in sinter 2 0 3 At low temperature (450-500°C) from α-Fe 2 o 3 reduced to γ-Fe 2 o 3 the result of. α-Fe 2 o 3 It is a trigonal cubic lattice, and γ-Fe 2 o 3 It is an equiaxed cubic lattice. Under the action of reducing gas, the change of the lattice causes its structure to be distorted, resulting in a huge internal stress, which leads to severe fragme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
Inventor 刘杰周明顺翟立委张辉徐礼兵
Owner ANGANG STEEL CO LTD
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