The study on optimization of copper leaching from waste PCBs by using response surface methodology

As a result, a model was established which is compatible with the experimental data at the correlation coefficient (R2 ) of . The optimal conditions were identified as Fe2(SO4)3 concentration of M, volume of H2O2 addition at 10 mL and leaching time of 10 h. Under this condition, leaching efficiency of percent was achieved. | Vietnam Journal of Science and Technology 56 (2C) (2018) 16-22 THE STUDY ON OPTIMIZATION OF COPPER LEACHING FROM WASTE PCBs BY USING RESPONSE SURFACE METHODOLOGY Tran Thi Ngoc Mai*, Tran Thi Thuy Nhan, Truong Thi Dieu Hien Faculty of Environment, Resource and Climate Change HCM City University of Food Industry, 140 Le Trong Tan, Tay Thanh ward, Tan Phu district, Ho Chi Minh City * Email: ngocmai0306@ Received: 10 May 2018, Accepted for publication: 20 August 2018 ABSTRACT Recycling printed circuit boards (PCBs) is an important solution not only to treat hazardous waste but also to recover valuable materials. This research focus on optimizing the leaching copper process from waste PCBs to recycle. This process was performed in Fe2(SO4)3 solution at room temperature and using H2O2 as an oxidant. For optimization, response surface methodology was used to investigate the different parameters, including Fe2(SO4)3 concentration, volume of H2O2 addition and leaching time. Design Expert software was applied to design the experiments and calculate the regression equation of the response function. As a result, a model was established which is compatible with the experimental data at the correlation coefficient (R2) of . The optimal conditions were identified as Fe2(SO4)3 concentration of M, volume of H2O2 addition at 10 mL and leaching time of 10 h. Under this condition, leaching efficiency of percent was achieved. After leaching, copper was recovered from extract solution by electrochemical technology with the efficiency of 85 percent. The results from this study hence proposed a very promising method for recycling copper in PCBs. Keywords: circuit boards (PCBs), leaching, recovery, response surface methodology. 1. INTRODUCTION Increasing demand for electronic equipments in modern life has been creating pollutional issues and generating 20-50 million tons of electronic wastes (or e-wastes) every year [1]. Because of their hazardous material .

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