Abstract: Coal gangue is a type of bulk solid waste produced during coal production. Its utilization presents notable environmental and resource wastage challenges. This study proposes a method to address these challenges by utilizing high-temperature fluidized bed technology, which has the potential to efficiently, economically, and on a large-scale convert coal gangue into construction sand through thermochemical reactions. To validate the feasibility of this technology, we conducted experiments in a high-temperature fluidized bed with a diameter of 160 millimeters using coal gangue samples from three different areas. The results reveal that with increasing temperature, the minimum fluidization velocity decreases and fluidization stability improves. Under stable fluidization conditions （twice the minimum fluidization velocity）, as well as appropriate operating temperature and raw material sphericity conditions, the products can meet the standard requirements of high quality construction sand aggregates. Among them, the product strength （crushing value） is related to the calcination temperature and the sphericity of the material. Increasing the sphericity of the raw material particles and the heat conversion temperature can effectively enhance the strength of the product （reduce the crushing value）.