This book provides a comprehensive exploration of modern hot metal and ferroalloy smelting technologies, focusing on mini blast furnaces as a key player in the global transition to green metallurgy. Drawing from years of practical experience and scientific insights, the book offers a field-tested description of these furnaces, providing practical recommendations and optimizing operational modes to significantly reduce carbon dioxide emissions. From theoretical foundations to practical applications, this book is useful for engineers, researchers, and industry professionals interested in the landscape of eco-friendly metallurgical practices.