3 years ago

Performance Evaluation of a Gypsum-Based Desulfurizer for Sulfur Recovery from the Smelter Off-Gas: Experimental Analysis and Thermodynamic Performance

Performance Evaluation of a Gypsum-Based Desulfurizer
for Sulfur Recovery from the Smelter Off-Gas: Experimental Analysis
and Thermodynamic Performance
Jing Chang, Qingjie Guo, Jingwen Xu, Hongjing Tian, Fuqi Yuan
To find some new desulfurizers for the smelter off-gas containing high levels of SO2, both the sulfur recovery performance and the regeneration performance of the sulfides of alkali metals and alkaline-earth metals were compared in both simulation and experiment. Although sodium sulfide (Na2S) showed a good sulfur recovery performance, its regeneration performance was poor due to the production of polysulfides. Calcium sulfide (CaS) was a feasible option of the desulfurizer because both its sulfur recovery performance and regeneration performance were satisfactory. CaS was prepared after the reduction of the commercial CaSO4 (Red-Ca), the flue gas desulfurization gypsum (Red-FGD), the phosphogypsum (Red-P), and the titanogypsum (Red-Ti), respectively. The results showed that the performances of Red-Ca and Red-FGD were quite similar and both of them were distinctly better than Red-P and Red-Ti. According to XRF analysis and XRD patterns, the impurities in Red-P and Red-Ti reduced the activity of CaS. The sulfur recovery performance of both Red-FGD and Na2S in the presence of oxygen decreased comparing with the performance in the absence of oxygen, while the decrease for Red-FGD was less than Na2S. Higher reaction temperature and lower space velocity could significantly enhance the sulfur recovery performance of Red-FGD. The sulfur recovery performance was very stable in the investigated NO concentration, i.e., 400–800 ppm. SEM photos indicated that some mesopores newly occurred in the reduction of the FGD particles but then the porosity decreased to some extent after the desulfurization.

Publisher URL: http://dx.doi.org/10.1021/acs.energyfuels.7b03276

DOI: 10.1021/acs.energyfuels.7b03276

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