**Preface to "Fundamentals of Advanced Pyrometallurgy"**

Pyrometallurgical technologies have the advantages of the ability to process low-grade ores, to have a high productivity, and to easily control by-products. With the depletion of minerals and the growing interest in processing of secondary raw materials, new pyrometallurgical technologies have been developed in recent years that are more efficient, economical, and environmentally friendly processes. These new technologies enabled complex primary and secondary raw materials to be processed and advanced materials to be produced more efficiently.

High-temperature reactions inside furnaces are difficult to observe directly. High-quality fundamental research provides not only a deep understanding of pyrometallurgical operations but also direct support for optimization of the processes and development of new technologies. This reprint includes experimental research and modeling simulations for the pyrometallurgical production of ferrous and nonferrous metals including cobalt, copper, lead, tungsten, iron, and steel.

The Special Issue Editors of this reprint express their gratitude to the authors for their contribution and willingness to share their research findings. The Special Issue Editors also thank the academic editors and reviewers for their time and effort, which ensured the quality and timeliness of the publication.

> **Baojun Zhao, Jianliang Zhang, and Xiaodong Ma** *Editors*
