The purification of non-ferrous foundry exhaust gas mainly consists of metal smoke. The foundry is a large energy consumer and has environmental protection in the casting industry. It is not only related to the process, but also has a great relationship with casting equipment. Energy-saving and emission-reduction measures in casting process and equipment: selection of castings with low energy consumption and low pollution Precision casting is a casting method that is relative to the traditional casting process. It can obtain relatively accurate shape and high casting accuracy. The more common practice is to first make the required rough (remaining margin is very small or no margin)