Ultra fast ultrasound-assisted decopperization from copper anode slime

Area of Science:

• Metallurgy
• Materials Science
• Chemical Engineering

Background:

• Anode slime is a valuable byproduct of copper electrorefining, containing significant amounts of copper and other valuable metals.
• Conventional decopperization methods are often time-consuming and may result in incomplete copper removal.
• Developing efficient and selective decopperization techniques is crucial for resource recovery and economic viability.

Purpose of the Study:

• To develop an ultra-fast decopperization method for anode slime using ultrasound-assisted leaching.
• To investigate the influence of key parameters on the decopperization efficiency.
• To evaluate the selectivity of the ultrasound-assisted method for copper removal.

Main Methods:

• Ultrasound-assisted leaching was employed for decopperization.
• Systematic investigation of parameters including ultrasound power, leaching time, sulfuric acid concentration, and liquid/solid ratio.
• Analysis of copper concentration in residues using chemical analysis.
• Investigation of mineralogical characteristics of anode slime and residues using techniques like XRD and SEM.

Main Results:

• Optimum conditions achieved a copper concentration of only 2.64% in the residue.
• Decopperization efficiency was considerably increased, and processing time significantly shortened compared to conventional methods.
• Selenium and tellurium were not detected in the leachate, indicating selective copper leaching.
• Changes in phase composition, morphology, and particle size were observed in residues, contributing to enhanced decopperization.

Conclusions:

• Ultrasound-assisted leaching is a highly effective and rapid method for anode slime decopperization.
• The method demonstrates excellent selectivity for copper, preserving other valuable elements.
• The observed changes in material characteristics are key to the improved decopperization efficiency.