title: Carbonation of gypsum from wet flue gas desulfurization process: experiments and modeling.
abstract: In this paper, waste gypsum from wet flue gas desulfurization (WFGD) mixed with NH3·H2O was applied for CO2absorption in the solid-liquid-gas phase system. The effects of operation temperature, CO2flow rates, and ammonia-to-gypsum ratio on carbonation process were discussed. Meanwhile, a model for CO2absorption in the suspension of WFGD gypsum and ammonia was established. The results indicate that higher temperature favors the reaction, and WFGD gypsum conversion can be achieved above 90% even at lower ammonia-to-gypsum ratio, while CO2conversion reaches 90% and ammonia utilization is up to 83.69%. The model fits well with the experimental results at various CO2flow rates and predicts the concentration distribution of the main species, including CO2absorbed, NH2COO-, and HCO3-.
authors.affiliation: School of Environment Technology, Nanjing Institute of Technology, Nanjing, Jiangsu, 211167, China. twy1102@gmail.com.
authors.forename: Wenyi
authors.initials: W
authors.lastname: Tan
authors.affiliation: School of Environment Technology, Nanjing Institute of Technology, Nanjing, Jiangsu, 211167, China.
authors.forename: Zixin
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: School of Environment Technology, Nanjing Institute of Technology, Nanjing, Jiangsu, 211167, China.
authors.forename: Hongyi
authors.initials: H
authors.lastname: Li
authors.affiliation: School of Environment Technology, Nanjing Institute of Technology, Nanjing, Jiangsu, 211167, China.
authors.forename: Youxu
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Environment Technology, Nanjing Institute of Technology, Nanjing, Jiangsu, 211167, China.
authors.forename: Zewen
authors.initials: Z
authors.lastname: Shen
mesh_terms: D002133:Calcium Sulfate / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry; D005740:Gases; D008956:Models, Chemical; D013455:Sulfur / Q000737:chemistry*; D013696:Temperature
chemical_list: D005740:Gases; D002245:Carbon Dioxide; D013455:Sulfur; D002244:Carbon; D002133:Calcium Sulfate
keywords: Ammonia; CO2 sequestration; Carbonation; Wet flue gas desulfurization gypsum