Here, "waste titanium dioxide powder" refers to titanium dioxide powder and materials containing titanium dioxide that have lost their original functionality due to substandard quality, expiration, process residues, or end-of-life, or although not completely losing their utility value, have been discarded during the production of titanium dioxide, and during processing and usage of products such as coatings, plastics, paper, and rubber. After collection, drying, sorting, and purification, this type of waste titanium dioxide powder can be recycled as a titanium resource, reused for the re-production of titanium dioxide, preparation of catalysts, pigment fillers, or in regeneration applications such as cement and building materials.