waste
Waste materials are old (idle) things, or abandoned, and can be recycled as renewable resources. Materials of little value left over from daily production and life. Including: obsolete, scrapped, second-hand, inventory, materials produced by production and life.
Such as scrap metal, waste paper, recycled plastics, etc. Even a considerable number of parts in waste household appliances can be reused as renewable resources.
Waste is also a kind of resource, but it has not been valued by people. For a long time, it has been adhering to the traditional idea of throwing away second-hand goods and waste products. This not only affects the ecological environment, but also these "treasures" have certain economic value and are a "way to make money" by turning waste into treasure.
Knowledge expansion:
The recovery of scrap steel is of great significance, because the quantity of steel that China can supply at that time and for a long time to come is far from meeting the needs of the four modernizations.
Because the country's foreign exchange is limited, it is impossible to increase the quantity of imported steel too much in the future, and the disposal of steel is lacking. In addition to settling down in domestic mines, importing ore and vigorously recycling scrap steel are important ways. It is not only one of the important methods to accelerate the development of iron and steel industry, but also one of the conditions to improve the progress of industrial and agricultural production and people's living standards.
Because steelmaking with scrap steel is about 75% more energy-saving than raw ore steelmaking, steelmaking with one ton of scrap steel can save 7 tons of transportation energy. Therefore, recycling scrap steel is not only conducive to saving energy and transportation capacity, but also can reduce environmental pollution and benefit mankind.
Putting forward and implementing scrap recycling as one of the methods to develop China's national economy in a period of time not only conforms to the principle of increasing production and saving, but also has great and far-reaching significance for ending the established economic policy.