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Process Optimization for Improving Compressive Strength of Preheated Pellets
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Guocheng ZHANG1, 2, Guoping LUO2, Wei SONG2
Mining and Metallurgical Engineering | 2024, 44(3) : 91 - 96
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Mining and Metallurgical Engineering | 2024, 44(3): 91-96
• METALLURGY •
Process Optimization for Improving Compressive Strength of Preheated Pellets
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Guocheng ZHANG1, 2, Guoping LUO2, Wei SONG2
Affiliations
  • 1.Faculty of Chemistry, Baotou Teachers' College, Baotou 014030, Inner Mongolia, China
  • 2.School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
Published: 2024-06-01 doi: 10.3969/j.issn.0253-6099.2024.03.020
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Based on the experience from production practices, an orthogonal experiment was performed by simulating a grate-rotary kiln process to investigate factors affecting compressive strength of preheated pellets and also find measures to improve the process. It is found that both OA iron ore and OB iron ore are fine-grained, with -0.074 mm grain content greater than 85%, which meets the basic requirements for particle size in pelletizing process. With 90% OA iron ore blended with 10% OB iron ore, the obtained pellet after drying and preheating process can have FeO content reduced from 26% to less than 4%, with the oxidation degree greater than 85%. With the following optimal thermal parameters of chain grate, including a drying temperature of 200 ℃ for air blowing and a drying temperature of 360 ℃ for ventilation, 720 ℃ for I-stage preheating and 990 ℃ for II-stage preheating, the obtained preheated pellet can have a compressive strength of 1 056 N/pellet. It is verified that the experimental result is in accordance with the anticipation.

ore blending  /  pelletizing process  /  preheated pellets  /  oxidation degree  /  imported iron concentrate  /  compressive strength  /  oxidation effect  /  process optimization  /  microstructure
Guocheng ZHANG, Guoping LUO, Wei SONG. Process Optimization for Improving Compressive Strength of Preheated Pellets[J]. Mining and Metallurgical Engineering, 2024 , 44 (3) : 91 -96 . DOI: 10.3969/j.issn.0253-6099.2024.03.020
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Year 2024 volume 44 Issue 3
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doi: 10.3969/j.issn.0253-6099.2024.03.020
  • Receive Date：2024-01-04
  • Online Date：2026-03-17
  • Published：2024-06-01
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  • Received：2024-01-04
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Affiliations
    1.Faculty of Chemistry, Baotou Teachers' College, Baotou 014030, Inner Mongolia, China
    2.School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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