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Outline
The effects of particle size and macro morphology on the comprehensive properties of pellets produced by the straight-grate induration machine were investigated. The results show that the particle size of finished pellets is mainly distributed within the range of 12-16 mm, accounting for more than 90%. Intact pellets account for 59.95%, while broken pellets and cracked pellets account for 24.71% and 15.35%, respectively. The crushing strength of intact pellets rises with an increase in particle size. As for the pellets with the same particle size, the macro morphology serves as the dominant factor determining their crushing strength. It is shown that intact pellets exhibit the highest crushing strength, whereas cracked pellets show the lowest crushing strength. The essential reason for the difference in crushing strength among pellets lies in the different bonding compactness of internal hematite grains. Large-sized intact pellets undergo insufficient oxidation and possess poor uniformity in internal structure. In terms of reduction performance, intact pellets with different particle sizes have negligible differences in reduction degree. For pellets with identical particle size, broken and cracked pellets feature a higher initial reduction rate, but present no obvious differences compared with intact pellets in terms of final reduction degree, reduction swelling index and anti-pulverization performance. Broken and cracked pellets suffer degraded mechanical properties and tend to damage the gas permeability of blast furnace burden during smelting, so their feeding proportion into the blast furnace should be strictly controlled. It is recommended that the proportion of intact pellets sized 12-14 mm be preferentially increased to balance pellet strength and metallurgical properties. This research can provide theoretical support for the optimization of pellet quality evaluation system and proportion of blast furnace burden.
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| 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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