<p>In this study, we systematically studied the effects of the carbon fixation experimental conditions on the binding efficiency of calcium ions (Ca²⁺), and further explored the reaction mechanism in the process of carbon dioxide (CO₂) gas phase fixation, focusing on the leaching solution of the non-magnetic products of industrial solid waste pulverized steel slag. The pH value, temperature, and CO₂ flow rate of the leaching solution were precisely controlled to achieve efficient conversion of Ca²⁺ ions. Under constant CO₂ flow rate (8 mL/min) and conversion time (60 minutes), by varying the pH and temperature, the optimal process conditions for the conversion of Ca²⁺ ions were determined. The binding efficiency of Ca²⁺ significantly improved in the range of pH 11.5 to 13.5 and leaching temperature range of 25 °C to 55&#xa0;°C. The highest binding efficiency of Ca²⁺ ions of 97.78 pct was achieved at a pH value of 12, a leaching solution temperature of 30&#xa0;°C, and a CO₂ flow rate of 8 mL/min. The obtained samples were comprehensively characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and Raman spectroscopy. The crystal structure was consistent with natural calcium carbonate, and the elemental composition ratio was accurate. These data demonstrate the ability of the method to efficiently prepare high-purity calcium carbonate. This study not only provides a reference for the resource utilization of industrial solid waste, but it is also expected to play an important role in greenhouse gas emission reduction, which is of great importance to promote green sustainable development.</p>