A process that utilizes high alkaline properties of steel slag to promote the carbonation reaction while saving acid and alkali consumption was proposed. The experimental results verified the feasibility of the indirect carbonation process involving acetic acid to carry out the carbonation reaction without the addition of alkali. It was concluded that steel slag has high alkalinity, and the alkaline components of steel slag can be preserved by two-step leaching to contribute to the carbonation reaction. The results show that under the condition of a liquid–solid ratio of 10, the pH of the mixed leachate obtained by leaching with 0.25–1 M acetic acid for steel slag with a particle size of < 38 μm were all above 11.7. At the same time, the calcium ions leaching ratio of the two-step method was also higher than that of the one-step method. In the case of liquid–solid ratio was 20 and acetic acid concentration was 0.25 M, the leaching ratio of calcium ions of one-step method was 28.84%, while the total leaching ratio of the two-step method was 32.18%, which increased by 11.61%. The results of X-ray diffraction analysis of the carbonation products of the two-step method show that the main component of the product was calcite and a small amount of aragonite, which indicates that the two-step method can carry out the carbonation reaction to produce calcium carbonate.
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This work was supported by the National Natural Science Foundation of China (Grant No. 51534001).
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Luo, Y., He, D. Research on Indirect Carbonation of Two-step Leaching for the Purpose of Utilizing the Alkalinity of Steel Slag. J. Sustain. Metall. (2021). https://doi.org/10.1007/s40831-021-00384-w
- Two-step leaching
- Indirect carbonation
- Leaching ratio
- CO2 sequestration