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Outline
The ultra-fine low-grade calcite-containing apatite concentrate that comes from Hebei Province cannot meet the grade requirement and is difficult to be utilized. For solving this problem, an experimental research was carried out to improve the concentrate grade. A depressant of CD-8 was adopted for calcite, the dominate gangue mineral affecting the grade of apatite concentrate, and a collector of CK-P with high selectivity was adopted for apatite. A closed-circuit experiment was performed with a direct flotation flowsheet, consisting of one roughing, one scavenging and three cleaning, with middlings sequentially returned. As a result, a phosphate concentrate with P2O5 grade of 32.02% was finally obtained with a recovery of 70.92%. This flowsheet was applied to industrial production with normal operation and stable flotation indicators, indicating that efficient utilization of such ultra-fine and refractory phosphorus resource was actualized.
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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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