Extraction and separation of copper and iron from copper smelting slag: A review

A comprehensive review on the recovery of copper values from copper slag

Indirect bioleaching recovery of valuable metals from electroplating sludge and optimization of various parameters using response surface methodology (RSM).

Due to the environmental hazard of waste printed circuit boards (WPCBs), there is an urgent need to develop efficient recycling technology of useful metal elements in WPCBs and to promote the efficient use of WPCBs. Therefore, we tried to intensify the efficient recovery of metal elements from WPCBs by introducing ultrasound into the flotation process. Scanning electron microscope (SEM) observation and laser particle size analysis confirmed that ultrasonic treatment was conducive to removing the epoxy resin and fine metal particles on the surface of glass fibers and promoting particle dispersion, which significantly improved metal recovery. In addition, wettability analysis demonstrated that the enhanced hydrophobicity of the non-metallic components caused by ultrasonic treatment improved the flotation performance of non-metallic components, thereby strengthening the reverse flotation separation efficiency of the metal components and the non-metallic components. Consequently, compared with traditional flotation, ultrasonic-enhanced flotation promoted the significant increase of total metal recovery and Cu, Al and Zn recovery from WPCBs, in which the total metal recovery and Cu, Al and Zn recovery from WPCBs increased by 7.20%, 4.82%, 15.41% and 5.58%, respectively. Based on this, our findings will provide an important guide for efficiently recovering valuable metal elements from WPCBs. 

Efficient recovery of valuable metals from waste printed circuit boards via ultrasound-enhanced flotation

Co-treatment of spent carbon anode and copper slag for reuse and the solidification of the constituent fluorine and heavy metals

Flotation is one of the most important methods for recovering copper from copper slag, However, traditional grinding may be over grinding sometimes, resulting in smaller interface difference, which leads to a decrease in the selectivity of flotation. In this study, a sodium carbonate combined with mechanical activation enhanced flotation for recovering copper from copper slag was developed. Based on the phase analysis, the flotation experiment was conducted. It showed that adding sodium carbonate before wet grinding can change the surface energy of copper slag particles and increase the possibility of cracks between chalcocite particles and gangue particles, while sodium carbonate can also increase the Eh of the copper slag flotation system and improve the flotation effect. Under the optimal flotation conditions of 600 g/t sodium carbonate and 300 g/t xanthate, the recovery efficiency of copper can reach 98.07% with a concentration of 36.13%. Moreover, the flotation kinetic model of copper slag was established and the results showed that the movement of copper slag in the flotation process conforms to the first-order kinetics. The addition of sodium carbonate increased the stability of the pulp and improved the flotation kinetics greatly, resulting in a better flotation performance. 

Copper Recovery from Copper Slags through Flotation Enhanced by Sodium Carbonate Synergistic Mechanical Activation

Recovery of metals from jarosite of hydrometallurgical nickel production by thermal treatment and leaching

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Copper Recovery from Copper Slags through Flotation Enhanced by Sodium Carbonate Synergistic Mechanical Activation

Recovery of metals from jarosite of hydrometallurgical nickel production by thermal treatment and leaching