Metals are derived from ores and are one of the most widely used materials in life, including iron, copper, aluminium, tin, lead, nickel, silver and zinc, etc. The combination of metals of different compositions is called an alloy. The recycling value of metals is extremely high and a large number of non-ferrous metals, including aluminium, copper and lead, have always been favoured by the recycling industry and due to their rarity, a large number of industries rely heavily on the recycling of scrap. With the use of metal shredders, scrap metal can be reduced to a uniform shape and size for separation and further processing.