The term "waste refractory materials" refers to refractory bricks, refractory castables, and other refractory products that have lost their original performance due to wear, breakage, chemical attack, or end-of-service life during use in high-temperature industrial kilns, metallurgical furnaces, chemical reactors, etc., or although not completely losing usability, have been discarded. After collection, classification, and processing, these materials can be reused as refractory raw materials or aggregates in recycling applications such as metallurgy and building materials.