How is antimony metal made by reacting stibnite with iron?

To produce antimony metal from stibnite (antimony sulfide, ${\text{Sb}}_2{\text{S}}_3$) using iron, the ore is reacted directly with scrap iron while in a molten state. This process liberates the antimony metal from the sulfide ore.1

Historically, this method of direct reduction was described as early as 1615 by the German physician Andreas Libavius. Once the reaction is complete and the crude antimony is further purified, the resulting metal—often referred to as regulus—is cast into cakes for industrial use.1