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1·XRD patterns show that all SDC powders calcined at various temperatures have a cubic fluorite structure.

XRD测试显示在不同温度预烧的粉体均成立方萤石结构。

2·The results show that the prepared samples have uniform crystallinity and fine crystalline, with a cubic fluorite structure.

结果表明：所得到的纳米晶粒度均匀、结晶完好，属于立方萤石结构。

3·In addition, the flowsheet structure and the content of heavy metal ions in the slurry have effects on the grade of fluorite concentrates as well.

另外流程结构及矿浆中重金属离子含量对萤石精矿品位也影响较大。