The recycling of waste raw materials for secondary production is a key link in the efficient utilization of resources under the circular economy model. It refers to the collection, classification, and pre-treatment (such as cleaning, crushing, melting, etc.) of waste generated during the production and consumption process, which is then converted into renewable raw materials that can replace native resources and reintroduced into industrial production processes to manufacture new products. This process is not only simple recycling, but also the reconstruction and extension of the value chain.