Hydrometallurgical Recovery of Germanium from Coal Gasification Fly Ash. Solvent Extraction Method

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• 作者：F&aacute ; tima Arroyo ; Constantino Fern&aacute ; ndez-Pereira
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2008
• 出版时间：May 7, 2008
• 年：2008
• 卷：47
• 期：9
• 页码：3186 - 3191
• 全文大小：59K
• 年卷期：v.47,no.9(May 7, 2008)
• ISSN：1520-5045

文摘

This article is concerned with a simple hydrometallurgical method for the selective recovery of germaniumfrom fly ash (FA) generated in an integrated gasification with combined cycle (IGCC) process. The methodis based on the leaching of FA with water and a subsequent concentration and selective separation of germaniumby a solvent method. Regarding the leaching step, the different operational conditions studied were liquid/solid (L/S) ratio and time of contact. The solvent extraction method was based on germanium complexationwith catechol (CAT) in an aqueous solution followed by the extraction of the Ge-CAT complex with anextracting organic reagent diluted in an organic solvent. The main factors examined during the extractiontests were aqueous phase/organic phase (AP/OP) volumetric ratio, aqueous phase pH, amounts of reagents,and time of contact. Germanium extraction yields were higher than 90%. Alkaline and acid stripping oforganic extracts were studied obtaining the best results with 1M NaOH (85%). A high-purity germaniumsolution was obtained. Experimental data presented in this work show that the extraction of germanium bythe solvent method designed can be selective toward germanium, and this element can be effectively separatedfrom arsenic, molybdenum, nickel, antimony, vanadium, and zinc.