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Outline
Hematite is the main associated mineral in a rutile ore deposit in Hebei Province. The rutile particles are fine and intergrown with or enclosed by hematite. Conventional magnetic separation has poor separation effect, making it difficult to achieve effective separation of iron and titanium. Reduction roasting has been proven as an effective technological approach for achieving efficient liberation of fine-grained iron ores from associated gangue minerals. A mineral quantitative automatic analysis system and scanning electron microscope (SEM) were adopted to clarify the mineral composition, element distribution and other information of the samples. The combined process of deep reduction and magnetic separation was adopted to treat the titanium-bearing hematite rough concentrate. Thermodynamic calculation was used to simulate the reaction behaviors of iron minerals and gangue minerals during the reduction process. The optimal experimental conditions were determined as follows: reduction temperature of 1 623 K, reduction time of 120 min, C/O molar ratio of 2.0, and magnetic field intensity of 85 mT. Under the optimal conditions, the metallization rate of reduced products reaches 78.94%. The total iron grade and total iron recovery of iron concentrate are 89.08% and 88.39%, respectively. The TiO2 grade and TiO2 recovery of titanium concentrate are 36.67% and 71.88%, respectively, showing favorable mineral processing and smelting indexes.
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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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