Furnace used in industry A furnace is necessary for heat treatment, as well as precipitation and the separation of metals. There are small furnaces suitable for workshops as well as large furnaces that can be used in industry. Furnaces are mainly used for the recycling of non-ferrous metals and other valuable metals, as well as for recovering c... Found on https://www.surplex.com/en/machines/c/furnaces-7987.html