Ion flotation of germanium from fly ash aqueous leachates
Ion flotation of germanium from fly ash aqueous leachates
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DOI：
10.1016/j.cej.2006.01.012
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发表时间：
2006-05
影响因子：
15.1
通讯作者：
A. Hernández-Expósito;J. M. Chimenos;A. I. Fernández;O. Font;X. Querol;P. Coca;F. Peña
中科院分区：
文献类型：
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作者：
A. Hernández-Expósito;J. M. Chimenos;A. I. Fernández;O. Font;X. Querol;P. Coca;F. Peña
锗-与在Elcogas工厂（Puertollano，Spain）的联合循环中的整体气化（IGCC）中产生的飞灰中包含的其它金属和类金属一起-可以通过水浸出来提取。本文报道了以络合剂和表面活性剂为捕收剂，用离子浮选法从浸出液中选择性回收锗的研究。使用不同的配体与十二胺作为捕收剂和pH值的影响进行了评价。锗回收的最佳条件为：邻苯二酚为络合剂，三倍化学计量比的试剂和pH 4-7。在此条件下，锗的回收率为100%，并减少了杂质的萃取。将回收的泡沫燃烧，并通过热重分析（TGA），X射线荧光（XRF）和X射线衍射（XRD）进行表征。得到高Ge产物（53%GeO2）。
The germanium – together with other metals and metalloids contained in the fly ash generated in the Integrated Gasification in Combined Cycle (IGCC) of Elcogas plant (Puertollano, Spain) – may be extracted by aqueous leaching. Here we report the study of the selective recovery of germanium from aqueous leachate by means of ion flotation, using a complexating agent and a surfactant as collector. The use of different ligands with dodecylamine as collector and the effect of the pH were evaluated. The optimal conditions found for germanium recovery are: catechol as complexating agent, triple stoichiometric ratio of the reagents and pH 4–7. In these conditions, germanium recovery was 100% and the extraction of impurities was reduced. The recovered froth was burned and characterized by thermogravimetric analysis (TGA), X-ray fluorescence (XRF) and X-ray diffraction (XRD). A high Ge product (53% GeO2) was obtained.