Inorganic Chemicals Industry >
Effect of liquid phase impurity Fe and Al ions on crystallization of ammonium sulfate in ammonia flue gas desulphurization
Received date: 2024-06-28
Online published: 2024-07-30
In ammonia flue gas desulphurization，it is very important to determine the effect of liquid phase impurities on the crystallization of （NH4）2SO4.In this paper，the effects of Fe3+ and Al3+ on the crystal shape and particle size distribution of （NH4）2SO4 were studied by SEM，XRD and particle size analysis，and the effect mechanism of Fe3+ and Al3+ on the crystallization of （NH4）2SO4 was revealed by molecular dynamics simulation.The results showed that when the concentration of Fe3+ in （NH4）2SO4 solution was less than 200 mg/L or the concentration of Al3+ was less than 400 mg/L，the crystallized crystals existed in a regular prismatic shape with average particle sizes of about 168 µm and 169 µm，respectively，the uniformity was relatively high.When the concentration of Fe3+ in （NH4）2SO4 solution was higher than 200 mg/L or the concentration of Al3+ was higher than 400 mg/L and continues to increase，the crystal shape of （NH4）2SO4 crystal changes to sheet，and the average particle size and uniformity of （NH4）2SO4 crystal showed a decreasing trend.Compared with Al3+，the increase of Fe3+ concentration had a greater inhibitory effect on the crystallization of （NH4）2SO4.The molecular dynamics simulation showed that the adsorption energy of Fe3+/Al3+ and （NH4）2SO4 crystal （020） surface was more negative than that of （NH4）2SO4 molecule and （NH4）2SO4 crystal （020） surface，and （NH4）2SO4 was easy to form sheet.With the increase of Fe3+/Al3+ concentration，the pH of （NH4）2SO4 solution was decreased，the metastable zone of solution was narrowed，resulting in the decrease of supersaturation，and ultimately the crystal size.Therefore，the crystallization properties of （NH4）2SO4 could be reasonably regulated by controlling the concentration of Fe3+ and Al3+.
XU Xiaojing , ZHANG Yuanyuan , LIU Wenqian , LIU Shuyan , WANG Fei , GAO Yangyan , YANG Yuhua , YANG Fengling . Effect of liquid phase impurity Fe and Al ions on crystallization of ammonium sulfate in ammonia flue gas desulphurization[J]. Inorganic Chemicals Industry, 2025 , 57(6) : 27 -34 . DOI: 10.19964/j.issn.1006-4990.2024-0364
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