Problem of excessive acidity in the extraction section
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There is a copper sulfide mine within the plant, and the acidity level in the extraction section is high. Experienced colleagues, could you tell me what aspects might be causing this problem?
Insufficient roasting? Or is the extraction incomplete?
It depends on where the liquid comes from before extraction, I guess There are mainly two reasons for high acidity: one is that the acidity of the liquid is already high before extraction, and the other is a high copper concentration; for every gram of copper extracted, approximately 1.5 grams of acid is produced, so when the copper concentration is high, the acidity increases after extraction
It depends on what process was used to obtain this solution earlier on; only then can we know why the acidity is high
Roasting of gold concentrate, leaching and extraction of copper from the roasting slag
Wow, copper sulfide ore has turned into gold concentrate. The roasting of gold ore is generally carried out through sulfation roasting. During leaching, a small amount of acid is sufficient to extract copper; if the acidity of the liquid after leaching is high, it means that too much acid was used during the leaching process Is it still because the acid consumption prevents an increase in copper leaching rate? Have you tried two stages of leaching? Another possibility is that the sulfation roasting was not complete; some sulfides remain during the roasting process, which can also lead to high acidity during the leaching stage
Yes, lowering the acid leaching rate means a lower value; thank you for your guidance
What if it’s a sulfide ore? What could be the possible causes of this problem and how to solve it? Thank you for the guidance
Two leaching stages can be tried: the second stage uses a high acid concentration to ensure a high leaching rate, and the leachate is neutralized with roasted ore to keep the solution’s pH at a level suitable for extraction. Additionally, the phase composition of the roasted ore can be checked to see if the roasting was thorough.