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Based on experimental studies on separation and quality improvement for a boron-bearing iron ore, a scheme for boron extraction and sulfur reduction was proposed, and a metallurgical process combined with mineral processing was determined, which consists of activation roasting, grinding, alkali leaching and magnetic separation. After activation roasting at 650 ℃ for 90 min in a neutral atmosphere, the obtained roasted ore was ground to a fineness of -0.075 mm 83.28%, and then leached for 60 min at 100 ℃, with liquid-to-solid ratio of 3∶1, leaching reagent of NaOH at a concentration of 15%, and stirring speed of 180 r/min. A boron-bearing mother liquor was obtained, with leaching rate of B2O3 at 94.62%. The leaching residue was subjected to conventional magnetic separation, resulting in an iron concentrate grading 54.94% TFe, containing 0.24% B2O3 and 0.077% S. It is concluded that boron can be fully recovered and the quality of iron concentrate can be also improved by adopting this processing scheme.
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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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