Sequential extraction of valuable trace elements from Bayer Process waste red mud samples
Sequential extraction of valuable trace elements from Bayer Process waste red mud samples
复制标题
从拜耳法废赤泥样品中连续提取有价值的微量元素
DOI：
10.1007/s40831-018-0164-6
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发表时间：
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影响因子：
2.4
通讯作者：
Justin S. J. Hargreaves
中科院分区：
文献类型：
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作者：
Hannian Gu;Ning Wang;Justin S. J. Hargreaves
我国拜耳法赤泥按化学成分可分为高铁一水硬铝石型赤泥、低铁一水硬铝石型赤泥和三水铝石型赤泥。采用XRF、ICP-MS、XRD和SEM等方法对三种典型拜耳法赤泥样品的化学组成和矿物组成进行了表征。例如，这些结果表明，GX（高铁一水硬铝石赤泥）中镧系元素含量大于1015 μg/g，钇313 μg/g，钪115 μg/g，铌252 μg/g，HN（一种低铁的一水硬铝石赤泥）中锂含量高（224 μg/g），而SD（三水铝石赤泥）具有非常低的有价值的微量元素含量，除了镓（59.4 μg/g）。采用连续提取法对三种赤泥样品中有价微量元素的可分离性进行了评价。应用萃取程序，GX中60%的钇和HN中65%的锂可以被萃取，这将是痕量金属回收的兴趣。
Bayer Process-derived red mud produced in China can be classified into three types according to chemical composition: high-iron diaspore red mud, low-iron diaspore red mud, and gibbsite red mud. The specific chemical and mineral compositions of three such typical Bayer-derived red mud samples have been characterized by XRF, ICP-MS, XRD, and SEM. These results, for example, indicate that GX (a high-iron diaspore red mud) contains more than 1015 μg/g lanthanides, 313 μg/g yttrium, 115 μg/g scandium, and 252 μg/g niobium and that HN (a low-iron diaspore red mud) has a high content of lithium (224 μg/g), whereas SD (a gibbsite red mud) possesses a very low valuable trace element content, except for gallium (59.4 μg/g). A sequential extraction procedure was carried out to assess the leachability of valuable trace elements in these three red mud samples. Applying the extraction procedure, 60% of the yttrium in GX and 65% of the lithium in HN could be extracted which would be of interest for trace metal recovery.