China Nonferrous Metallurgy

The silver separated residue of copper anode slime is the tailings of extracting precious metals from anode slime. The yield is about 50% of anode slime. It contains valuable metals such as lead, tin, barium, antimony, bismuth, gold, silver, platinum and palladium, and has great recovery value. Traditional treatment methods tend to extract single elements or precious metals such as gold and silver, and there are few methods to recover valuable metals such as barium.In this paper, silver separated residue of copper anode slime with high content of lead, barium and tin is used as raw material to test, and lead and barium were directly extracted step by step by the process of lead carbonate-hydrochloric acid leaching lead-barium carbonate-hydrochloric acid leaching barium-gold and silver extraction. The separation, enrichment and distribution of lead, tin, barium, gold and silver in the process were analyzed. The results show that the direct recovery rates of lead, barium and tin in the silver separated residue of copper anode slime are 76.69%, 93.16% and 99.91% respectively. The lead, barium and tin were recovered in the form of lead sulfate, barium sulfate and tin concentrate, respectively. The grade of lead, barium and tin was 97.5%, 95% and 45.84%, respectively, the enrichment of gold and silver in barium separated residue was 98.74% and 95.14%, respectively. The yield of tin concentrate is 23.44%. This process realizes the efficient separation and comprehensive recovery of lead, barium, tin, gold and silver. The leaching system of lead and barium is recycled, with less reagent consumption and mild process conditions. It can provide reference for similar enterprises to treat copper anode slime.