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Main treatment methods for copper anode slime

     

Copper anode slime is an insoluble solid produced at the anode during the electrolytic refining of blister copper. Its yield generally accounts for about 0.2% to 1% of the mass of blister copper anode plates, and it usually contains high levels of precious metals. According to relevant data, more than 60% of China's gold and silver production comes from copper-lead electrolytic anode slimes. Therefore, anode slime is an important secondary raw material for extracting rare and precious metals, attracting much attention from resource recyclers.

Copper anode slime typically has a particle size of 100-200 mesh and appears gray-black or light gray, with a relatively complex phase composition. Approximately 70% of copper exists in metallic form, while the rest is in copper compounds; silver mainly exists in elemental and compound forms; gold is mostly in free state; and platinum group metals (PGMs) are primarily in metallic or alloy state.

Main treatment methods for copper anode slime: The general process involves "pretreatment → separation of valuable and base metals → recovery of base metals → extraction and separation of precious metals". Currently, three processes are applied to pretreated anode slimes both domestically and internationally:

1. Traditional pyrometallurgical-electrolytic treatment;

2. Hydrometallurgical treatment;

3. Combined mineral processing and metallurgical treatment.

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