The method and efficiency of recovering the metals from the remaining waste materials prior to extraction and refining play an important role in the efficiency of the overall recycling process. The valuable entrapped metallic particles present in process drosses and slags can be recovered by ball milling the drosses and grinding the slags. This fragments the brittle oxide materials (in which the metallics are locked) to a greater extent than the more ductile metals which can be separated on subsequent screening. Swarf and turnings after degreasing are shredded in a hammer mill and baled while light scrap such as sheet, tubing, and scrapped or faulty domestic utensils are simply baled. Heavy scrap such as girders, ingot moulds and railway lines need only to be cut into convenient sizes for charging to the melting furnace. Borings and fines are best briquetted, sintered or pelletised, although the cost of sintering and pelletising may be prohibitive. Large components such as washing machines and cars must be treated to separate the different metals present. To this end cryogenic processing (subjection the components to very low temperatures, followed by shredding in a hammer mill) has been used to separate ferrous metals from non-ferrous metals. At very low temperatures the differences in ductility of metals becomes increased such that with liquid nitrogen (-196◦C) treatment ferrous metals fragment to a greater extent that non-ferrous metals which can be separated on subsequent screening. One technique developed is to press the composite component into the form of a bale which is then subjected to a liquid nitrogen spray followed by crushing in a hammer mill and screening to separate the ferrous metals from the non-ferrous metals.