In non-ferrous industries, pyrometallurgical processesProcess involve high-temperatureTemperature processesProcess which generate off-gases characterized by extreme heat, high dust content, and hazardous contaminants. These gases must be cooled and cleaned prior to further handling to ensure environmental standards and maintain processProcess integrity. Off-gases generated from primary or traditional smeltingSmelting and converting processesProcess, existing non-ferrous industries or from modern or future recyclingRecycling processesProcess differ from the type of contaminants present in the off-gas and its quantities. Primary smelters often contain high load particulate matter, SO2, and heavy metals and high mercury loads, while recyclingRecycling processesProcess contain low load of SO2 but very high loads of halides (hydrofluoric acid, hydrochloric acid, hydrobromic acid, and bromine). For environmental compliance with specific clean gas requirements, multi-stage gas cleaning trains and advanced construction materials may become necessary. Additionally, sustainabilitySustainability and energy efficiency are critical considerations in the design of modern gas cleaning plants. In this paper, GEA presents different possibilities to treat these off-gases as well as the latest innovations. Besides the equipment of a typical gas cleaning train for primary copper smelters, which consists of hot electrostatic precipitators, scrubbers, and packed cooling towers followed by wet electrostatic precipitators and often mercury removalRemoval technologies, additional equipment for halide removalRemoval as well as advanced material concepts and energy savingEnergy saving equipment will also be explored.