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In order to investigate the microstructure and mineral composition of sintered limonite (42% in mass fraction) within different size fraction, a sintering pot test was used to simulate the actual sintering process conditions. Thereby, the sintered ore with different particle sizes were prepared, and then mineralogical microscope was used to analyze its microstructure characteristics. The results show that if the mixed ore has the powdered ore with size larger than 5 mm in a mass fraction of 25.23%, the finally sintered ore with small particle size increases, presenting a poor pelletizing performance. As the sintered ore has its particle size reduced from 40 mm to a range of 5-12 mm, the bonding phase therein is in a mass fraction decreasing from 59.10% to 23.19%, and the calcium ferrite has its morphology converting from being acicular to flaky and agglomerated, and its mass fraction decreases from 39.43% to 17.26%. It is found that the sintered ore has converted from the structure with magnetite interwoven with calcium ferrite to granular structure composed of hematite, magnetite and bonding phase. The euhedral to subhedral magnetite grains are transformed to be anhedral, and the number of micropores between and within the grains increases, presenting a "porous and thin-walled" structure, resulting in worse performance in the strength of the sintered ore.
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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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