Reaction behavior of copper slag with waste acid and its arsenic removal mechanism
LI Yong-kui1,2, ZHU Xing1,2, QI Xian-jin1,2, WANG Hua1,2, ZHANG Xin3, HUI Xing-huan3, HAO Feng-yan1,2, CAI Gui-yuan1,2
1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China;
2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
3. Chuxiong Dianzhong Non-ferrous Metal Co. Ltd, Chuxiong 675000, China
On the basis of composition and phase characteristics of copper slag, the reaction behavior of copper slag with arsenic-containing waste acid and the rule of arsenic removal were investigated, and the reaction kinetics of arsenic removal was also elucidated. Under optimal conditions, including a copper slag dosage of 0.2g/mL, a reaction temperature at 23℃, and a reaction time of 24hours, a maximum adsorption capacity of copper slag of 25.89mg/g was achieved, following by an arsenic removal efficiency of 99.56%. The leaching toxicity of arsenic-fixed copper slag was lower than 5mg/L that is the standard threshold value of hazardous waste. The arsenic-fixed copper slag could be classified as a general solid waste. The kinetic studies revealed that the arsenic adsorption on the copper slag was described by a pseudo-second-order kinetic equation. The process of arsenic removal was limited by the release rate of iron ion. Arsenic was removed via the ion exchange adsorption and the chemical precipitation, which were also beneficial to the arsenic stabilization. A large number of iron ions were released during the solid-liquid reaction between copper slag and waste acid, which could precipitate arsenic via the ion exchange adsorption and the chemical precipitation, forming relative stable arsenates and their derivatives for the arsenic removal. The copper slag exhibits a superior performance for the arsenic removal from waste acid and provides a high-efficient and low-cost method for the disposal of waste acid from heavy non-ferrous smelting industry.
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