Iron ore low-carbon sintering method

Abstract

The invention belongs to the field of steel smelting, and particularly relates to an iron ore low-carbon sintering method which is low in sintering energy consumption. According to the technical scheme, the iron ore low-carbon sintering method includes the steps that iron ore, fuel and a fluxing agent are distributed and mixed to form a mixture for sintering, wherein magnetite in the iron ore is not smaller than 50% by mass, non-magnetite m1 is greater than 0 but smaller than or equal to 40%, metallurgy waste m2 is greater than or equal to 0 but smaller than or equal to 10%, the non-magnetite is at least one of hematite, limonite and siderite, and the metallurgy waste is iron waste mainly composed of Fe and FeO. According to the method, raw material constitutes of the mixture and technical parameters are adjusted, so that non-carbon heat input is increased, carbon content is reduced, and sintering energy consumption is reduced.

Description

technical field

[0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a low-carbon sintering method of iron ore. Background technique

[0002] Sintering is the most important process for iron ore powder agglomeration. The result of sintering is that the powder particles are bonded, the strength of the sintered body is increased, and the aggregates of powder particles are changed into aggregates of crystal grains, so as to obtain the required physical, mechanical and metallurgical properties of the agglomerated products. For use in blast furnace ironmaking.

[0003] Iron and steel enterprises are large coal consumers, and the energy consumption of the sintering process accounts for about 10% to 15% of the total energy consumption, ranking second only to ironmaking. Among them, the sintering solid fuel consumption accounts for about 75% to 80% of the process energy consumption. To reduce the sintering process energy consumption, t...

Examples

Embodiment 1

[0073] Laboratory test:

[0074] The mixed materials were completed according to Table 2, and 10 groups of parallel experiments were performed. According to the existing sintering process, sintering is carried out in the steps of cloth distribution, ignition, ventilation sintering, thermal crushing, cooling, screening and sizing. The sintering conditions and sintering results are shown in Table 3.

[0075] Table 2 Laboratory low-carbon sintering main material ratio (%)

[0076]

[0077] Table 3 Laboratory low-carbon sintering conditions and sintering results

[0078]

[0079] Test evaluation method: using the comprehensive index method, for multiple indicators of a system, the higher the better some indicators, called high-quality indicators, such as the drum index, utilization coefficient, etc. in this test; the lower the better some indicators , known as low-quality indicators, such as solid fuel consumption, low-temperature reduction pulverization rate, etc. The i...

Embodiment 2

[0082] 260m 2 Sintering machine industrial test:

[0083] Complete the batching and mixing according to the ratio in Table 4, and conduct 7 groups of parallel experiments. According to the existing sintering process, the steps of cloth distribution, ignition, ventilation sintering, thermal crushing, cooling, screening and sizing are carried out for sintering. The experimental results are shown in Table 5.

[0084] Table 4260m 2 Sintering machine low-carbon sintering material structure and proportion (%)

[0085]

[0086] Active lime 1 in Table 4 contains CaO90%, and active lime 2 contains CaO85%.

[0087] Table 5260m 2 Industrial test results of low-carbon sintering of sintering machine

[0088]

[0089] 260m in a sintering plant 2 The low-carbon sintering industrial test was carried out on the sintering machine, and 7 groups of experiments were carried out according to the raw material ratio in Table 4. The weight distribution of utilization factor 35, solid fuel ...

technical field

[0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a low-carbon sintering method of iron ore. Background technique

[0002] Sintering is the most important process for iron ore powder agglomeration. The result of sintering is that the powder particles are bonded, the strength of the sintered body is increased, and the aggregates of powder particles are changed into aggregates of crystal grains, so as to obtain the required physical, mechanical and metallurgical properties of the agglomerated products. For use in blast furnace ironmaking.

[0003] Iron and steel enterprises are large coal consumers, and the energy consumption of the sintering process accounts for about 10% to 15% of the total energy consumption, ranking second only to ironmaking. Among them, the sintering solid fuel consumption accounts for about 75% to 80% of the process energy consumption. To reduce the sintering process energy consumption, t...

Examples

Embodiment 1

[0073] Laboratory test:

[0074] The mixed materials were completed according to Table 2, and 10 groups of parallel experiments were performed. According to the existing sintering process, sintering is carried out in the steps of cloth distribution, ignition, ventilation sintering, thermal crushing, cooling, screening and sizing. The sintering conditions and sintering results are shown in Table 3.

[0075] Table 2 Laboratory low-carbon sintering main material ratio (%)

[0076]

[0077] Table 3 Laboratory low-carbon sintering conditions and sintering results

[0078]

[0079] Test evaluation method: using the comprehensive index method, for multiple indicators of a system, the higher the better some indicators, called high-quality indicators, such as the drum index, utilization coefficient, etc. in this test; the lower the better some indicators , known as low-quality indicators, such as solid fuel consumption, low-temperature reduction pulverization rate, etc. The i...

Embodiment 2

[0082] 260m 2 Sintering machine industrial test:

[0083] Complete the batching and mixing according to the ratio in Table 4, and conduct 7 groups of parallel experiments. According to the existing sintering process, the steps of cloth distribution, ignition, ventilation sintering, thermal crushing, cooling, screening and sizing are carried out for sintering. The experimental results are shown in Table 5.

[0084] Table 4260m 2 Sintering machine low-carbon sintering material structure and proportion (%)

[0085]

[0086] Active lime 1 in Table 4 contains CaO90%, and active lime 2 contains CaO85%.

[0087] Table 5260m 2 Industrial test results of low-carbon sintering of sintering machine

[0088]

[0089] 260m in a sintering plant 2 The low-carbon sintering industrial test was carried out on the sintering machine, and 7 groups of experiments were carried out according to the raw material ratio in Table 4. The weight distribution of utilization factor 35, solid fuel ...

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