China's foundry industry should adopt the development mode of circular economy

• it is an important way to reduce energy consumption to establish a resource-saving and environment-friendly casting industry by adopting the development mode of circular economy. All kinds of industrial furnaces in foundry process are large consumption of resources and the source of environmental pollution. The energy consumption can be reduced by making full use of the residual heat in the foundry process. For example, a factory in shandong introduced waste heat from the cupola into the drying room to dry the castings after painting, so as to save energy. Waste heat from cupola is used to heat domestic water. According to a German saying, garbage is things that are misplaced. Enough attention should be paid to waste reduction, reuse, recycling and remanufacturing in foundry production. It is reported that the cost of dumping one ton of waste sand is higher than that of buying new sand, and the indexes of recycled sand are no less than that of new sand. According to the comparison between the price of new sand and the cost of recycled sand in China, the cost of recycled sand is only one third of that of the new sand. The granulation of a large amount of slag can be used as raw material to produce cement, which is a good way to reduce the emission of pollutants.

Over the past 20 years, the development of China's foundry industry is mainly achieved by relying on cheap labor and domestic resources, energy and even a large amount of investment. With the rapid development of China's economy and continuous expansion of its scale, domestic energy, resources and ecological environment are increasingly restricting economic growth, and the development of casting industry is facing a series of major challenges. If we continue to follow the previous extensive, high-growth path at the expense of resources and the environment, we will certainly fail. China has been the world's largest casting production country for six consecutive years. But, in the foundry industry in our country faces energy constraints, environmental safety of pressure increases, the international casting industry competition and the protection of intellectual property rights to strengthen trends, casting in our country will become power from power, and to reduce the energy consumption of 20% in five years, reduce the pollutant emissions by 10%, only rely on innovation and improve the quality of the practitioners, by establishing harmonious manufacture idea, by the development of circular economy to just have hope.