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半干法烧结烟气脱硫灰中含有大量CaSO_3,而CaSO_3对于脱硫灰的稳定性具有重要影响,限制了脱硫灰的处理和综合利用。为了解决该问题,采用低温静态氧化改性实验和高温动态焙烧改性实验,在掺加和不掺加催化剂条件下,对含CaSO_3的脱硫灰进行了氧化改性研究,并结合热重实验考察了半干法烧结烟气脱硫灰中CaSO_3的高温动态氧化改性效果。结果表明,在低温为45、75和90℃时,掺入不同催化剂对半干法烧结烟气脱硫灰中CaSO_3进行氧化改性2 h,效果依次为:MnO_2>Fe_2O_3>不掺催化剂>V_2O_5,且CaSO_3的氧化率均低于2.2%;在不掺催化剂的条件下,在350℃以上焙烧30~60 min,CaSO_3的氧化率均可达到85%以上。结合热重分析结果发现,选择合适的焙烧温度和时间对提高CaSO_3的氧化率有重要作用。
Semi-dry sintering flue gas desulfurization ash contains a lot of CaSO_3, and CaSO_3 desulfurization ash stability has an important impact, limiting the desulfurization ash treatment and comprehensive utilization. In order to solve this problem, using low temperature static oxidation experiment and high temperature dynamic calcination experiment, the oxidative modification of desulfurized ash containing CaSO_3 was studied with and without catalyst, High temperature dynamic oxidation modification of CaSO_3 in semi-dry sintering flue gas desulfurization ash. The results showed that CaSO_3 was modified by oxidative modification of semi-dry flue gas desulfurized ash at 45, 75 and 90 ℃ for 2 h with the following effects: MnO 2> Fe 2 O 3> V 2 O 5, And the oxidation rates of CaSO_3 are both lower than 2.2%. The oxidation rates of CaSO_3 can reach more than 85% when the catalyst is roasted at 350 ℃ for 30 ~ 60 min without catalyst. According to the results of thermogravimetric analysis, it is found that choosing the proper calcination temperature and time plays an important role in increasing the oxidation rate of CaSO_3.