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Water-leaching characteristic of valuable trace metals (U, V, and Ga) from (NH4)2SO4-treated coal ash: A coprecipitation behavior at high temperature.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.jhazmat.2020.122113 Zhe Yang 1 , Wei Zhang 1 , Yumei Li 2 , Changxiang Wang 1 , Sen Yang 1 , Zhi Tang 1 , Danqing Liu 2 , Yilian Li 1
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.jhazmat.2020.122113 Zhe Yang 1 , Wei Zhang 1 , Yumei Li 2 , Changxiang Wang 1 , Sen Yang 1 , Zhi Tang 1 , Danqing Liu 2 , Yilian Li 1
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Coal ash (CA) becomes the most significant industrial solid waste and attracts much attention due to its potential environmental risk and reuse as the supplementary material. In this study, experiments were conducted to investigate the mode of occurrence and the leaching behavior of valuable trace metals (U, V, and Ga) from CA and (NH4)2SO4-treated CA (NCA), based on the recovery of aluminum. Integrations of Fe- and K-oxide with Si-Al glass increased the ash strength and obstructed the activation of NH4+ on amorphous Al-bearing phases, resulting in a limited improvement in the leaching efficiency of trace metals. On the other side, a higher liquidus temperature, contributing to the dissolutions of Al3+ and Ca2+, could promote the leaching of U from NCA as well, whereas the water-leaching behaviors of V and Ga involved a sophisticated trend with temperature > 40℃. Water-leached V/Ga tended to transfer into Fe-Mn oxide-bound and residual V/Ga owing to the noticeable hydrolysis of Fe and Ti ions that facilitated the formation of coprecipitation. However, 0.1 M H2SO4 could re-dissolve that coprecipitation, and thus leaching efficiencies of U, V, and Ga were 1.9, 1.3, and 5.0 times higher than those by directly leaching CA, respectively.
中文翻译：
从（NH4）2SO4处理的煤灰中有价值的痕量金属（U，V和Ga）的水浸特性：高温下的共沉淀行为。
煤灰（CA）成为最重要的工业固体废物，由于其潜在的环境风险和作为补充材料的再利用而备受关注。在这项研究中，进行了实验，以铝的回收率为基础，研究了CA和（NH4）2SO4处理的CA（NCA）中有价值的痕量金属（U，V和Ga）的发生方式和浸出行为。Fe和K氧化物与Si-Al玻璃的集成增加了灰分强度，并阻碍了无定形含Al相上NH4 +的活化，导致微量金属的浸出效率有限。另一方面，较高的液相线温度有助于Al3 +和Ca2 +的溶解，也可能促使U从NCA中浸出，温度> 40℃时，钒和镓的浸出行为呈复杂趋势。由于Fe和Ti离子的明显水解促进了共沉淀的形成，水浸出的V / Ga倾向于转移到Fe-Mn氧化物结合的和残留的V / Ga中。但是，0.1 M H2SO4可以重新溶解该共沉淀物，因此U，V和Ga的浸出效率分别比直接浸出CA的浸出效率分别高1.9、1.3和5.0倍。
更新日期：2020-01-15
中文翻译：
从（NH4）2SO4处理的煤灰中有价值的痕量金属（U，V和Ga）的水浸特性：高温下的共沉淀行为。
煤灰（CA）成为最重要的工业固体废物，由于其潜在的环境风险和作为补充材料的再利用而备受关注。在这项研究中，进行了实验，以铝的回收率为基础，研究了CA和（NH4）2SO4处理的CA（NCA）中有价值的痕量金属（U，V和Ga）的发生方式和浸出行为。Fe和K氧化物与Si-Al玻璃的集成增加了灰分强度，并阻碍了无定形含Al相上NH4 +的活化，导致微量金属的浸出效率有限。另一方面，较高的液相线温度有助于Al3 +和Ca2 +的溶解，也可能促使U从NCA中浸出，温度> 40℃时，钒和镓的浸出行为呈复杂趋势。由于Fe和Ti离子的明显水解促进了共沉淀的形成，水浸出的V / Ga倾向于转移到Fe-Mn氧化物结合的和残留的V / Ga中。但是，0.1 M H2SO4可以重新溶解该共沉淀物，因此U，V和Ga的浸出效率分别比直接浸出CA的浸出效率分别高1.9、1.3和5.0倍。
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