The Influence of different additives on the transformation behavior of arsenic during the combustion of the P. vittata
LI Xiao-le, DUAN Lun-bo, YU Zhi-jian, YAN Yong, ZHAO Chang-sui
Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
P. vittata is one of the hyperaccumulators of arsenic(As),a series of experiments were conducted in a horizontal tube furnace to investigate the influence of CaO, MgO and dolomite on the transformation behavior of As during the combustion of P. vittata. The results showed that the As retention of CaO, MgO and dolomite was efficient during 400~700℃,and the MgO performed best, followed by CaO and dolomite. The most proper temperature of As retention of CaO and MgO was 500℃, while that was 700℃ for dolomite. It was found that the low temperature would promote the formation of soluble As when the additives were used, because the physical adsorption played the important role in low temperature zone. When the temperature exceeded 800℃, the content of soluble As in solid residue decreased, due to the influence of the additives on the self-retention of ash, where the additives would suppress the formation of soluble As compound. In addition, with the use of additives, a small amount of As3+ was found in the solid residue when the temperature was lower than 700℃.
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LI Xiao-le, DUAN Lun-bo, YU Zhi-jian, YAN Yong, ZHAO Chang-sui. The Influence of different additives on the transformation behavior of arsenic during the combustion of the P. vittata. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(2): 643-650.
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