New process of removing impurities from aluminum alloy dross by roasting-pickling process
ZHENG Chun-yan1,2, XIE Ming-zhuang1,2, ZHAO Hong-liang1,2, LÜ Han1,2, LIU Feng-qin1,2
1. State Key Laboratory of New Technologies in Iron and Steel Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract：Aluminum alloy dross is a kind of hazardous waste with complex components produced in aluminum industry, and it is considered to have potential recycling value because of its high alumina content. A roasting-pickling process for removing impurities from aluminum alloy dross was presented. The influences of acid types, acid concentration, reaction temperature, extraction time, liquid-solid ratio and other factors on removing impurities from aluminum alloy dross during pickling were investigated. The phase and element composition of aluminum alloy dross before and after impurity removal were analyzed by XRD and XRF. The results show that the optimal pickling conditions are sulfuric acid, acid concentration of 1 mol/L, reaction temperature of 60 ℃, leaching time of 30 min, liquid-solid ratio of 10 mL/g. After pickling, the main phases of aluminum alloy dross are alumina (α-Al2O3) and Mg-Al spinel, the sum of the two accounting for about 94%, and the mass fraction of alumina can reach 82.73%. This study provides new idea for resource utilization of aluminum alloy dross.
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2023, Vol. 33 
