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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >A Greener Approach to Extract Copper from Fertilizer Industry Spent Catalyst
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A Greener Approach to Extract Copper from Fertilizer Industry Spent Catalyst

机译：一种更环保的方法，从化肥工业中提取铜催化剂

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摘要

Large quantities of catalysts after their useful life are discarded as waste material from fertilizer industry. Disposal of spent catalyst is a problem as it falls under the category of hazardous industrial waste due to its heavy metals concentration. This investigation applied a novel approach to extract copper from spent low-temperature shift catalyst (CuO–ZnO–Al_2O_3) using chelation process. Ethylenediaminetetraacetic acid (EDTA) was used as the chelating agent. Optimum parameters to extract 95% copper were found as: EDTA concentration 0.5 M, reaction temperature 100°C, solid-to-liquid ratio 1:25 (g/ml), particle size 120 μm and reaction time 4 h. A kinetic analysis of the experimental data was done by shrinking core model which revealed the rate-controlling step of the leaching process as product layer diffusion. The activation energy calculated was 10.58 kJ/mol which supports leaching process to be the product layer diffusion controlled. The process adopted is ecofriendly as the EDTA was recovered after the extraction of copper from the spent catalyst and reused again. The recycled EDTA obtained after the extraction was characterized by NMR and SEM. The activity of the recycled EDTA was found to be consistent with the fresh EDTA.
机译：在其有用的寿命之后弃出大量催化剂作为来自肥料工业的废料。废催化剂的处理是由于其重金属浓度的危险工业废物类别下降。本研究应用了一种使用螯合法从废的低温移催化剂（CuO-ZnO-Al_2O_3）中提取铜的新方法。乙二胺四乙酸（EDTA）用作螯合剂。发现95％铜的最佳参数是：EDTA浓度0.5M，反应温度100℃，固 - 液比1:25（g / ml），粒径为120μm，反应时间4小时。通过收缩核心模型来完成实验数据的动力学分析，该核心模型揭示了浸出过程的速率控制步骤作为产物层扩散。计算的激活能量为10.58 kJ / mol，其支持浸出过程，以成为产品层扩散控制。采用的过程是Ecofriendly，因为在从废催化剂中萃取铜后回收EDTA并再次重复使用。萃取后获得的再循环EDTA的特征在于NMR和SEM。发现再循环的EDTA的活性与新鲜的EDTA一致。

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