祥鹄科技

Summary： In order to address the dual challenges of environmental pollution and sustainable energy systems, this study investigates a novel COsequest technology through steel slag, a by-product of steel production. It introduces an ultrasonic-enhanced leaching process that uses CHCOOH to extract calcium and magnesium from steel slag, thereby facilitating the synthesis of CaCOwhiskers. The results showed that the selective leaching rate of Ca + Mg was significantly increased by increasing the ultrasonic power, improving solid-liquid consistency, increasing the initial reaction temperature, and using lower concentrations of CHCOOH. Kinetic analysis under ultrasonic conditions showed a low activation energy of 11.45 kJ•mol, indicating the presence of surface-controlled reaction kinetics during ultrasonic leaching. Eventually, high-purity CaCOwhiskers were synthesized under carefully controlled conditions: using 400 W of ultrasonic power, maintaining a reaction temperature of 70 C, and performing the procedure for 15 minutes with an initial solution pH of 9.2. This innovative approach not only helps to reduce CO2 emissions, but also promotes the reuse of steel slag, addresses environmental issues and supports a sustainable energy system. The report highlights the potential to integrate sustainable practices into the steel industry, in line with global efforts to mitigate climate change and reduce pollution.

Summary： The abundant resource of steel slag makes it an interesting prospect for long-term COstore through mineral carbonization . In this paper, the dissolution of steel slag in acetic acid (HAc) solution and the immobilization of COin in steel slag leachate are investigated to synthesize high-value CaCO. The results showed that the microwave water bath conditions were beneficial for increasing the leaching rate of Ca and Mg elements in steel slag, while the low concentration HAc solution showed high selectivity for Ca+Mg. In microwave-enhanced water bath reactions, the leaching rate and selectivity of Ca+Mg can be increased by increasing the reaction temperature, extending the leaching time, decreasing the concentration of the HAc solution, and increasing the stirring rate. The kinetic parameters of elemental calcium, including the apparent activation energy, were 14.51 kJ⋅mol, indicating control by surface chemical reactions. Finally, by introducing 20% CO into the leachate, high-purity CaCO whiskers could be synthesized at 400 W ultrasonic conditions at a reaction temperature of 70 °C, a reaction time of 15 minutes, and a solution pH of 9.1. This strategy promotes the parallel utilization of thin smoke gases and large quantities of solid steel slag waste, thereby improving the economic and environmental performance of the steel industry.