Rönnskärsverken in Skelleftehamn is a smeltery owned by Boliden. Rönnskär receives raw materials from Boliden´s mines and electronic materials. The metals that are mined at Rönnskär are mainly copper, lead and zinc, as well the precious metals silver and gold, where copper is the largest volume of the metal production. Today Rönnskär meet the heat demand with waste heat from Rönnskär´s processes in its internal heating network and Skelleftehamn and Ursviken. During the colder days or accidents, Rönnskär´s energy central fires oil to maintain the steam demand for condensation of steam to the district heating network. Oil fired steam production is something that Rönnskärsverket wants to reduce.    This Report is a pre study that will present a future potential solution to utilize slutabs-heat for SO2 (l) production, thereby release intermediate circuit heat to the district heating network. In the pre study pipes, pumps, heat exchangers were dimensioned, and estimated installations cost was calculated. During the pre-study, drawings for installation of the pipelines was designed.    The pre study showed that is was possible to install pipelines and heat exchangers to make use of the slutabs-heat for SO2 (l) production, thereby release the intermediate circuit heat to the district heating network. The pre study also showed that the oil consumption in the oil-fired steam boilers would be reduced by 660 m3 during the estimate period and the payback time on the investment cost is 4 years.