Abstract: The CO2 mineral sequestration-based ammonium slag recycling carbon sequestration process has promising economic potential and CO2 emission reduction benefits, which can help steel companies achieve high-value comprehensive utilization of steel slag solid waste and waste resources containing CO2 flue gas. Raw material loss, reaction time and impurity ion behavior directly affect the operation cost and product quality of the process, and ultimately determine its application value. In this study, the economic potential of the steel slag ammonium salt recycling carbon fixation process was evaluated through laboratory scale test data, and suggestions were made for process parameter determination and optimization directions from the cost control perspective. The results show that the freshness of the solution remains basically unchanged during 10 cycles of leaching solution, and the main reason for the loss of raw materials is the loss of solution volume; the precipitation process CO2 flow rate reaches 15-20 L/min when the precipitation time drops to 20-30 min, at this time the precipitation process is not a limiting factor of the process operation rate; no obvious enrichment of impurity ions is seen in the circulating solution, and the precipitated calcium carbonate products of ten rounds of reactions are in line with industry standards; the CO2 reduction factor of this process to produce precipitated calcium carbonate is 1.543; the profit of this process to reduce 1 ton of CO2 is 1325.25 RMB, and the profit can reach 1654.74 RMB by reducing the solution loss, which has significant economy.