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Outline
An optimized two-step separation-titration method was adopted to determine calcium fluoride content in a complex low-grade fluorite ore. Firstly, the sample was leached with 2% dilute hydrochloric acid for 150 min under magnetic stirring to efficiently separate interfering minerals such as calcite, dolomite and apatite, showing the leaching rates exceeding 98%. The residue was further leached with 80 g/L aluminum trichloride solution, and the calcium fluoride content was subsequently quantified via EDTA titration. Given that approximately 10% of fluorite would be leached by 2% hydrochloric acid, a correction coefficient (K=1.10) was introduced to calibrate the test results. The experimental results demonstrate that the relative errors for samples with various calcium fluoride contents determined by this method are within the permissible range (±0.25%), showing excellent consistency with theoretical blending values. The determination results are basically consistent with data obtained by Mineral Liberation Analyzer (MLA) and total fluorine content testing. It is concluded that this method effectively addresses the difficulty in accurate determination of calcium fluoride in complex low-grade fluorite ore, and can provide a reliable reference for mineral resource evaluation and optimization of beneficiation and metallurgical processes.
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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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