Optimization and mechanism of surfactant accelerating leaching test

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• 作者：Chun-ming Ai 艾纯明 ; Ai-xiang Wu 吴爱祥 ; Yi-ming Wang 王贻明…
• 刊名：Journal of Central South University
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：23
• 期：5
• 页码：1032-1039
• 全文大小：1,473 KB
• 刊物类别：Engineering
• 刊物主题：Engineering, general
  Metallic Materials
  Chinese Library of Science
  
• 出版者：Central South University, co-published with Springer
• ISSN：2227-5223
• 卷排序：23

文摘

To solve the problem of slow leaching speed of copper, surfactant was added into lixivium as leaching agent in the experiment. Based on physical chemistry and seepage flow mechanics, the leaching mechanics of surfactant was analyzed. The solution surface tension and surfactant adsorbing on the surface of ore have a significant impact on the surface wetting effect. With leaching rate for response, the study screened out three main factors by Plackett-Burman design method: the sulfuric acid concentration, surfactant concentration and temperature. Among these three factors, the surfactant concentration is the most important contributor to leaching rate. After obtaining the experiment center by the steepest ascent experiment, a continuous variable surface model was built by response surface methodology. By solving quadratic polynomial equation, optimal conditions for leaching were finally obtained as follows: the sulfuric acid concentration was 60 g/L, the surfactant concentration was 0.00914 mol/L, and the temperature was 45 °C. The leaching rate was 66.81% in the optimized leaching conditions, which was close to the predicted value, showing that regression result was good.Key wordssurfactantoptimizationleachingresponse surface