Through the reduction reaction of Fe3O4 and graphite rod, the viscosity of slag was reduced and the settlement of matte in slag was promoted. The reduction of Fe3O4 in copper slag by a graphite rod was studied and the kinetics of the reduction process analyzed. The results show that the content of Fe3O4 decreased with increase in reduction temperature and reduction time. The slag samples after reduction were examined and found to consist of three layers: a slag foam layer, a fayalite layer, and a matte layer. A substantial number of large-sized matte particles were found in the slag foam layer. Also, a layer of Fe3O4 was attached to the upper surface of the matte layer. The reduction of Fe3O4 was concluded to be a second-order reaction, the apparent activation energy was 610 kJ/mol, and the limiting step was the Boudouard reaction.

中文翻译：

---

在石墨棒存在下从铜冶炼渣中还原磁铁矿

通过Fe3O4与石墨棒的还原反应，降低了炉渣的粘度，促进了炉渣在炉渣中的沉降。研究了用石墨棒还原铜渣中的 Fe3O4 并分析了还原过程的动力学。结果表明，随着还原温度和还原时间的增加，Fe3O4的含量降低。检查还原后的矿渣样品，发现由三层组成：矿渣泡沫层、铁橄榄石层和无光泽层。在矿渣泡沫层中发现了大量大尺寸的无光泽颗粒。此外，一层 Fe3O4 附着在无光泽层的上表面。Fe3O4 的还原反应为二级反应，表观活化能为 610 kJ/mol，限制步骤为 Boudouard 反应。