The Lead-Tin Alloying Furnace (LTAF) process is designed to recover lead and tin from the converting slags from the non-ferrous metals industry. The slag is usually transported in a ladle via crane to the LTAF. The slag is poured the LTAF furnace. Reverts can be added with a boat if necessary. For reduction, Fe-containing material is added to the LTAF. Porous plugs (with N₂ gas) at the bottom of the furnace stirs the bath and enhances the reaction between slag and Fe phase. Other elements like Ni, Pb and Sn are partly reduced as well, forming a black copper phase with Ni, Pb and Sn impurities. The metal is tapped from LTAF into a ladle, which is placed under the furnace by ladle transfer car.