This is a theoretical and empirical investigation of the synergistic preparation of ferrophosphorus via carbothermal reduction using phosphate rock and copper slag as raw materials. The results showed that with an increase in carbon dosage, the amount of ferrophosphorus obtained first increased and then decreased. The amounts of ferrophosphorus obtained after separation were highest at a carbon dosage of 12 wt%. The distribution ratio of Fe–P in the slag and metal was opposite to that the amounts of ferrophosphorus, highlighting its facile and complete separation from the slag. A high carbon dosage also hinders the aggregation, growth, and separation of ferrophosphorus particles. In addition, the obtained ferrophosphorus impurity content is the lowest at a carbon dosage of 12 wt%. The products were characterized by X-ray diffraction, chemical composition and scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The main phases of the ferrophosphorus were Fe₃P and Fe₂P, and the main phase of the residue was CaSiO₃.

Graphical Abstract

中文翻译：

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磷矿与铜渣协同还原制备磷铁：碳添加的优化

这是一项以磷酸盐岩和铜渣为原料，通过碳热还原协同制备磷铁的理论和实证研究。结果表明，随着加碳量的增加，获得的磷铁量先增加后减少。在碳用量为 12 wt% 时，分离后获得的磷铁含量最高。Fe-P在渣和金属中的分布比例与磷铁的含量相反，突出了它与渣分离的容易和完全。高碳剂量也阻碍了磷铁颗粒的聚集、生长和分离。此外，得到的磷铁杂质含量在碳用量为 12 wt% 时最低。通过 X 射线衍射对产物进行了表征，化学成分和扫描电子显微镜，以及能量色散 X 射线光谱。磷铁的主要相是 Fe₃ P和Fe ₂ P，残渣的主相为CaSiO ₃。

图形概要