Related Experiment Video
Updated: Jan 16, 2026

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
Effect of carbonic anhydrase-producing microorganisms on carbonation of steel slag powder under suspension process
Yijin Fan1, Yangfan Xu1, Chunxiang Qian1
1School of Materials Science and Engineering, Southeast University, Nanjing 211189, China; State Key Laboratory of Engineering Materials for Major Infrastructure, Nanjing 211189, China.
Abstract:
Addressing the needs of carbon dioxide capture and waste residue utilization, this study tackles the low reaction rate of existing steel slag carbonation under ambient temperature and pressure, investigating microorganisms' role in the process under suspended reaction conditions. Results show microorganisms significantly accelerate the carbonation rate: the time to reach 10% amount of carbon dioxide fixation is shortened to 1/5 of that of direct carbonation. Key influencing factors include steel slag powder moisture content, reaction humidity, and carbon dioxide concentration. After carbonation, the calcium-silicon phase mainly transforms. Compared with direct carbonation, microorganisms speed up carbon dioxide dissociation-diffusion in the liquid film on steel slag particles, enhance chemical reaction rate, promote carbonation of dicalcium silicate, and improve early-stage carbonation rate. The decrease of the diffusion rate of the product layer is the main rate-limiting step in the later carbon fixation reaction. This study provides process methods and data support for promoting microorganism-assisted steel slag carbonation technology.
Related Concept Videos
Carbonation Shrinkage
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
Turbulent Flow: Problem Solving
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
Corrosion of Reinforcement
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
Acid Attack on Concrete
The rate at which hydrogen...
Steel Manufacturing
During this smelting process, limestone plays a crucial role by forming slag. Slag captures impurities within the molten iron, such...
Factors Affecting Solubility

