化工学报2017，Vol.68Issue(1)：281-288,8.DOI:10.11949/j.issn.0438-1157.20161173
蜈蚣草燃烧过程中As迁移转化规律
Arsenic transformation behavior during combustion of P. vittata
摘要
Abstract
P. vittata is one of the hyperaccumulators of arsenic(As), the combustion experiments were conducted in a horizontal tube furnace to investigate the transformation behavior of As during the combustion of P. vittata. Results show that the release of As in P.vittata increased first then decreased, reaching the highest at 500℃. With increasing temperature from 400℃ to 500℃, the higher release rate is due to the volatility of the inorganic As at lower temperature. With further increase the temperature from 500℃ to 900℃, As release decreased which may be attributed to the fast oxidation of As and the formation of some inorganic compounds. Moreover, the soluble As in the solid residue mainly presents as As5+, and the content varies largely with the temperature with a peak value of 81%of total As at 800℃. The content of soluble As5+decreases before 500℃ due to the volatility of the inorganic As. The physical adsorption of some compounds plays an important role for the As fixation at the temperature from 500℃ to 700℃, while the As fixation is mainly conducted by the chemical oxidation at 800℃. The content of soluble As5+decreases a little, possibly because of the sintering of the ash. Considering the As recycling process, 800℃ is recommended as the optimum combustion temperature for the P. vittata.关键词
蜈蚣草/燃烧/As/可溶As/形态Key words
P. vittata/combution/As/soluble As/speciation分类
资源环境引用本文复制引用
李小乐,段伦博,雷梅,赵长遂..蜈蚣草燃烧过程中As迁移转化规律[J].化工学报,2017,68(1):281-288,8.基金项目
国家自然科学基金项目（51206023）。 （）
