首页|Making waste profitable:Efficient recovery of metallic iron from jarosite residues
Making waste profitable:Efficient recovery of metallic iron from jarosite residues
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To address the hazardous by-product of zinc smelting and resource utilization of jarosite residue,this study applies an electric field-assisted hot acid treatment to completely recycle iron (Fe). This innovative approach aims to enhance the leaching efficiency of Fe from jarosite residue. The introduction of an electric field changes the charge distribution on the surface of the particles to enhance ions and electrons exchange and promotes the collision between particles to strengthen reaction kinetics. Based on the above,the leaching efficiency of Fe in jarosite under sulfuric acid attack has improved observably. The result shows that Fe leaching efficiency reaches 98.83％,which is increased by 28％ under the optimal experimental conditions:current density of 30 mA·cm-2,H2SO4 concentration of 1.5 mol·L-1,solid-liquid ratio of 70 g·L-1,temperature of 80 ℃ and time of 12 h. Leaching kinetics calculations show that the apparent activation energy is 16.97 kJ·mol-1 and the leaching of jarosite residue is controlled by a mixture of chemical reaction and diffusion,as well as the temperature and concentration of the leaching solution have an influence on leaching. This work provides a feasible idea for the efficient leaching of Fe from jarosite residue.
Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST),Ministry of Education,Southwest University of Science and Technology,Mianyang 621010,China
School of Environment,Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control,Ministry of Education,Henan Normal University,Xinxiang 453007,China
School of National Defense Science and Technology College SWUST,Ministry of Education,Southwest University of Science and Technology,Mianyang 621010,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of China
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