How about the Aluminum die casting process and its recycling?

http://www.cn-casting.net : Aluminum die casting process is to pour heated liquid aluminum or aluminum alloy into the  inlet port of die casting machine,after die casting,casting aluminum or aluminum alloy parts whose shape and size is restricted by the mould. Aluminum die casting process solves the aluminum slag problems.During the smelting aluminum materials,selectively adding slag-forming agent and refining agent,enabling the ultimate in recycling process producing aluminum slag,aluminum ash full return process applications to  improve the recovery of aluminum,and avoid the aluminum ash pollution.