Bioleaching of Al from Coarse-Grained Waste Printed Circuit Boards in a Stirred Tank Reactor

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• 作者：Kaibin Fu^a ; ^b ; ^{fukaibin@126.com" class="auth_mail" title="E-mail the corresponding author} ; Bin Wang^a ; ^b ; Haiyan Chen^a ; ^b ; Mengjun Chen^a ; ^b ; Shu Chen^a ; ^b
• 关键词：Coarse-grained ; aluminum ; bioleaching ; waste printed circuit boards ; stirred tank reactor
• 刊名：Procedia Environmental Sciences
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：31
• 期：Complete
• 页码：897-902
• 全文大小：301 K

文摘

The present work was aimed at studying the bioleachability of aluminium from coarse-grained waste printed circuit boards in a stirred tank reactor. Al recovery, variation of ORP and pH value, during the process of zero-valence Al bioleached by A. ferrooxidans, were discussed in detail. When WPCBs concentrations was 100 g/L, bacterial inoculation was 10% (v/v), temperature was 30 °C, Al extraction rates of WPCBs was up to 82.13% after 30 days. Experimental results indicated that regeneration cyclic process of Fe²⁺ in bioleaching reactions can accelerate the extraction of Al. Zero-valence aluminium was mainly leached out chemically in the initial stage, and mainly leached out by Fe³⁺ and H⁺ in the late stage. The alkaline substance of WPCBs and the oxidation of Fe²⁺ consume H⁺, these result in the increasement of pH value in initial stage, whereafter, the decrease of pH value attributes to the hydrolysis of the ferric ion and jarosite precipitation formation.