In this method, the raw anode slime is directly subjected to leaching to remove copper without prior treatment. In the leaching operation, a large amount of air is blown into a 10% to 15% dilute sulfuric acid solution, and the copper is oxidized to soluble sulfuric acid by the action of oxygen and sulfuric acid in the compressed air. Cu+H 2 SO 4 + Usually the leaching operation the lining of lead (lead-antimony alloys are also integrally cast) or stainless steel tank leaching is performed. Use steam for direct heating and compressed air for agitation. Leaching with high- iron (Fe 3 + ) copper sulfate electrolysis waste from a copper electrolysis plant can remove more metallic copper. Alternatively, by adding high-iron sulfate or other oxidizing agent to the leachate at the end of the leaching process, the leaching can be accelerated: Cu+Fe 2 (SO 4 )3→CuSO 4 +2FeSO 4 The ferrous iron produced by the reaction is reoxidized to high-sulfur sulfate: ZFeSO 4 +H 2 SO 4 + The advantage of direct leaching of copper by direct agitation of sulfuric acid is that the equipment and operation process are simple, the sulfuric acid consumption is small, and the silver in the anode mud is not lost in the leachate. Its disadvantages are: Cu2S in the anode mud is not dissolved, the leaching rate of copper is low, and part of the selenium in the anode mud is oxidized into the leachate. In order to improve the leaching rate of copper during the direct leaching of copper by direct agitation of sulfuric acid, some factories firstly add the sulfuric acid and water to the slurry of the slurry, and then remove the copper from the copper strip. The leaching rate of copper can reach over 99%. .
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O 2 CuSO 4 +H 2 O O 2 Fe 2 (SO 4 ) 3 +H 2 O
Copper anode mud air agitated sulfuric acid leaching copper removal