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A technology of sintering and sintering return, which is applied in the field of improving the quality of sintering, can solve the problems of poor quality of sintering ore, and achieve the effects of increasing the granularity of sintering, easy implementation, and improving air permeability
Active Publication Date: 2021-12-17
SHANGHAI MEISHAN IRON & STEEL CO LTD
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[0008] The purpose of the present invention is to provide a method for improving the quality of sintered ore, which mainly solves the technical problem of poor quality of sintered ore produced by the existing technology. Reasonable distribution of sintering heat to improve sinter quality
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Embodiment 1
[0036] Embodiment 1, according to the technical quality index of sintering ore, calculate the mass ratio of ultra-fine iron ore concentrate powder, hematite rich ore powder, sintering return ore, flux and solid fuel, and control the mass percentage of MgO in the sintering ore to be 1.4%, the mass percentage of FeO is 8.5%, and the basicity (CaO / SiO2) of the sintered ore is 1.95.
Embodiment 2
[0037] Embodiment 2, according to the technical quality index of sintering ore, calculate the mass ratio of ultra-fine iron ore concentrate powder, hematite rich ore powder, sintering return ore, flux and solid fuel, and control the mass percentage of MgO in the sintering ore to be 1.5%, the mass percentage of FeO is 8.0%, and the basicity (CaO / SiO2) of the sintered ore is 1.88.
Embodiment 3
[0038] Embodiment 3, according to the technical quality index of sintered ore, calculate the mass ratio of ultra-fine iron ore concentrate powder, hematite rich ore powder, sintered return ore, flux and solid fuel, and control the mass percentage of MgO in the sintered ore to be 1.35%, the mass percentage of FeO is 8.5%, and the basicity (CaO / SiO2) of the sintered ore is 1.85.
[0039] Table 1 Ratio of mixed material ore mix in the middle part of the sintered material layer of the embodiment of the present invention, unit: mass percentage.
[0040] category Hematite rich mineral powder Sintering return ore dolomite quicklime gray stone solid fuel Example 1 72.9 9.5 2.3 7.3 3.4 4.6 Example 2 74.6 8.5 2.3 6.9 3.2 4.5 Example 3 74.3 8.7 2.3 7 3.3 4.4
[0041] Table 2 Ratio of mixed material ore mixture in the upper part of the sintered material layer in the embodiment of the present invention, unit: mass percentage.
[00...
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Abstract
The invention discloses a method for improving the quality of sintered ore. The method mainly solves the technical problem that the quality of sintered ore produced through an existing process is poor. According to the technical scheme, the method for improving the quality of the sintered ore comprises the following steps that (1) a sintering material layer middle mixture is prepared; (2) a sintering material layer upper portion mixture is prepared; (3) material distribution is conducted, wherein limonite lump ores are evenly distributed at the bottom of a sintering trolley, the particle size of the limonite lump ores is 8-20 mm, and the thickness of a limonite lump ore material layer is 25-35 mm; the sintering material layer middle mixture is distributed on the surface of the limonite lump ore layer, and the thickness of the sintering material layer middle mixture is 70-85% of the total height of the sintering trolley; and then the sintering material layer upper portion mixture is distributed on the surface of the sintering material layer middle portion mixture; and (4) air draft sintering is conduced, wherein the sintered material is subjected to ignition and air draft sintering, and the sintered ore is produced. The sintered ore produced by the method is excellent in metallurgical performance and low in cost.
Description
technical field [0001] The invention relates to a production method of sintered ore, in particular to a method for improving the quality of sintered ore, specifically, a method for improving the quality of sintered ore by rationally distributing the heat of the sintered material layer, which belongs to the technical field of production of sintered ore as an ironmaking raw material . Background technique [0002] During the sintering process, the iron-containing raw materials and coke powder fuel are uniformly mixed, and the mixed material is spread on the sintering trolley by the distributor for sintering. For the sintered fuel, due to segregation, the fuel with coarser particles is easily distributed at the bottom of the material layer, so that the heat at the bottom of the sintered material layer is excess, while the upper part of the material layer is insufficient. The difference in heat demand between the upper and lower material layers and the uneven distribution of fu...
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Application Information
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