Effects of O2 mole fraction and ultraviolet irradiation on arsenic leaching from coal with flue gas

被引：0
作者：
Lu Z.-Z. [1 ]
Sun W.-S. [1 ]
Guo Y.-F. [1 ]
Tao L.-L. [1 ]
Zhang J.-S. [1 ]
Chen S.-M. [1 ]
机构：
[1] College of Environmental Science and Engineering, Qingdao University, Qingdao
来源：
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2019年 / 33卷 / 04期
关键词：
Arsenic; Coal; Flue gas; Free radical; Sulfur dioxide; Ultraviolet light;
D O I：
10.3969/j.issn.1003-9015.2019.00.003
中图分类号：
学科分类号：
摘要：
In order to study the effects of O2 mole fraction and ultraviolet (UV) irradiation on arsenic leaching from coal with flue gas, N2, O2 and SO2 (1% mole fraction) were used to simulate flue gas which was introduced into a bubbling reactor containing coal slurry. Profiles of arsenic leaching ratio and the ratio of As(III) to total arsenic leached were determined at different O2 mole fractions, and under dark and UV irradiation conditions. The arsenic leaching kinetics was analyzed. The results show that increasing O2 mole fraction can effectively increase the leaching ratio of arsenic from coal. However, the ratio of As(III) to total arsenic leached is about 50% even the O2 mole fraction is increased to 20%. UV irradiation can also increase the leaching ratio of arsenic. It can reduce the ratio of As(III) to total arsenic leached to less than 5%, which is due to the formation of strong oxidizing free radicals in the slurry under UV irradiation. This is particularly favorable for the subsequent disposal processes of leached arsenic, such as precipitation and separation. Kinetic analysis results show that the arsenic leaching process follows the reaction-controlled shrinking core model. © 2019, Editorial Board of Journal of Chemical Engineering of Chinese Universities". All right reserved."
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页码：989 / 997
页数：8
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