Song HY  Seo JB  Kang SK  Kim ID  Choi BW  Oh KJ

Vol. 20,  No. 1, pp. 42-50, Mar.  2014

Ferro-nickel slag Kinetic modeling of sequestered CO2 sequestration rate

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In this study, the Mg(OH)2 slurry was made form ferro-nickel slag and then used for CO2 sequestration. The experiments were in the order as leaching step, precipitation, carbonation experiments. According to the leaching results, the optimal leaching conditions were H2SO4 concentration of 1 M and the temperature of 333 K. In the Mg(OH)2 manufacturing step, NaOH was added to increase the pH upto 8, the first precipitation was confirmed as Fe2O3. After removal the first precipitation, the pH was upto 11, the Mg(OH)2 was generated by XRD analysis. The Mg(OH)2 slurry was used for CO2 sequestration. The pseudo-second-order carbonation model was used to apply for CO2 sequestration. The CO2 sequestration rate was increased by the CO2 partial pressure and temperature. However, CO2 sequestration rate was decreased when temperature upto 323 K. After CO2 sequestrated by Mg(OH)2, the CO2 can be sequestrated stable as MgCO3. This study also presented optimal sequestration condition was the pH upto 8.38, the maximum MgCO3 can be generated. This study can be used as the basic material for CO2 sequestration by ferro-nickel slag at pilot scale in the future.