从富硒石煤回收制备粗硒的新工艺 |
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引用本文: | 田欢,帅琴,徐生瑞,鲍征宇,谢淑云.从富硒石煤回收制备粗硒的新工艺[J].地球科学,2014,39(7):880-888. |
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作者姓名: | 田欢 帅琴 徐生瑞 鲍征宇 谢淑云 |
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作者单位: | 1.中国地质大学地球科学学院, 湖北武汉 430074 |
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基金项目: | 中国地质调查局项目(Nos.1212011120324,12120113087100,12120113087000) |
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摘 要: | 通过实验研究了湖北恩施富硒石煤燃烧中烟气硒的回收, 提出了一条回收制备粗硒的有效途径, 即采用高效钙基吸附剂固定石煤燃烧排放的硒, 用亚硫酸钠还原硒化合物制备出粗硒产物.模拟实验确定了Na2SO3还原硒的最佳条件: 还原温度353 K, 还原时间15 min, HCl浓度4 mol·L-1, 亚硫酸钠加入量(质量比)Na2SO3∶Se最佳比值为6, 硒的回收率达98.48±1.95%(n=3), 在实验应用中也得到了较好的回收率.XRD和SEM-EDS分析表明产物硒的晶型和纯度等是受反应体系中多种因素共同影响的.
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关 键 词: | 富硒石煤 硒 亚硫酸钠 还原 回收 地球化学 |
收稿时间: | 2013-09-26 |
Novel Technology for Preparation of Crude Selenium from Se-Rich Stone Coal |
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Abstract: | A new effective recovery method of crude Se by Na2SO3 is presented from high efficient calcium-adsorbent used for combustion of Se-rich stone coal, which was collected from Yutangba, Enshi, Hubei Province. The reduction of Se reaches 98.48±1.95% (n=3) in the simulation process and the optimium parameters are determined as follows: terperature 353 K, time 15 mins, HCl concentration 4 mol·L-1 and mass ratio between Na2SO3 to Se of 6∶1. An acceptable recovery rate of selenium was also obtained from the actual experiment using Se-rich stone coal. The XRD and SEM-EDS analysis results show that the crystal system and purity of Se are controlled by many factors in the reaction system. |
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