硝酸与微波辅助硝酸萃取工业污泥中铜的比较研究

Xiangyi Zha, Chunwei Han, Jiancheng Tu, Dandan Ma
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引用次数: 0

摘要

采用传统酸萃取法和微波辅助酸萃取法对工业污泥中的铜进行了脱除。考察了酸浓度、萃取时间、污泥粒径和固液比对工业污泥中铜的去除率的影响。结果表明,以1 N硝酸萃取90 min, S/L比为1/20是最经济的传统萃取条件;微波功率越高,铜的可提取分数越高;活性炭的加入使萃取80% Cu的工业污泥所需的萃取时间从15 min缩短到10 min。微波吸收剂的加入、微波功率的输入和S/L比是影响微波酸萃取Cu的最重要因素。结果表明,硫酸是有效的萃取剂;提取了与Fe-Mn氧化物结合的Cu组分。相反,在酸萃取过程中,残渣部分仍然存在。
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Comparative study of copper extraction by nitric and microwave assisted nitric acid extraction from industrial sludge
Cu was removed from industrial sludge by traditional and microwave assisted acid extraction. The effects of acid concentration, extraction time, sludge particle size and solid/liquid (S/L) ratio on removal of Cu from industrial sludge were investigated. The results indicated that extraction of Cu by 1 N nitric acid for 90 min at an S/L ratio of 1/20 is the most economical traditional extraction conditions; the higher microwave power can increase the Cu extractable fractions; active carbon addition shortened the extraction time required to extract 80% Cu industrial sludge from 15 to 10 min. The addition of a microwave absorber, the microwave power input and the S/L ratio are the most important factors to microwave acid extraction of Cu. The results reveal that sulfuric acid was an effective extractant; Cu fraction bound to the Fe-Mn oxides was extracted. Conversely, the residue fraction remained during acid extraction.
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