It is an important way to reduce energy consumption to adopt the development mode of circular economy and establish a resource-saving and environment-friendly foundry industry. Various industrial furnaces and kilns in foundry production process are the major resource consumers and the source of environmental pollution. Fully utilizing the waste heat of furnace and kiln in casting process can reduce energy consumption. For example, a factory in Shandong introduced cupola waste heat into the drying room to dry the sprayed castings, which achieved the effect of energy saving. Use cupola waste heat to heat domestic water. According to the Germans, garbage is something that has been put in the wrong place. The waste reduction, reuse, recycling and remanufacturing in foundry production should be paid full attention to. It is reported that the cost of dumping a ton of waste sand is higher than that of purchasing new sand, and the indexes of recycled sand are no less than that of new sand. Compared with the cost of recycled sand, the cost of recycled sand is only one third of that of new sand. A large amount of slag can be used as raw material for cement production through granulation, which is a good way to reduce pollutant emissions.

Over the past 20 years, the development of China's foundry industry has mainly depended on cheap labor and large or even excessive investment in domestic resources and energy. With the rapid development of China's economy and the continuous expansion of its scale, the constraints of domestic energy, resources and ecological environment on economic growth are increasing day by day. The development of foundry industry is also facing a series of major challenges. If we follow the path of extensive, high-growth and sacrificing resources and environment in the past, we will surely not be able to follow. China has been the world's largest castings producer for six consecutive years. However, in view of the situation that China's foundry industry is facing with increasing energy constraints, increasing pressure on environmental safety, intensifying competition in the International Foundry Industry and strengthening protection of intellectual property rights, China's foundry industry should transform from a big country into a powerful country, reduce energy consumption by 20% and pollutant emissions by 10% within five years. Only by innovating and improving the quality of employees can we rely on the establishment of a harmonious manufacturing concept and development. Only by developing circular economy can we have hope.