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Abstract
Ammonium sulfate crystallization of ammonia-based flue gas desulphurization was studied. Experiments were conducted to study the influence of pH, temperature, and the fly ash content of the solution on ammonium sulfate crystallization. The fly ash promoted ammonium sulfate crystallization was investigated as well. The results show that the pH has a significant impact on the mean crystal size and the shape of the ammonium sulfate crystals, and it is appropriate to keep pH at 5.0–5.5. The mean crystal size at a temperature of 60°C is larger than that of 70°C, and it will not change significantly from 70 to 90°C. Appropriate concentration of fly ash is helpful to ammonium sulfate crystallization and fly ash acts as a crystal nucleus, while higher fly ash concentration prevented the growth of large-size crystals and surface absorption becomes obvious. The ideal concentration of fly ash for the largest size crystal is about 4 g/L.