What are good methods for removing iron from copper-enriched solutions obtained through copper electrolysis?

It is generally a partial open circuit to leaching.

Reply to 2# mzkj: This will cause an increase in the acidity of the extraction solution as well as an increase in the copper content, right?

After iron removal by electrowinning, it is of course necessary to consider the acid and copper balance in the leaching and electrowinning cycles. Generally, metallurgical calculations are performed based on test data to adjust the operations.

This post was last edited by Caojianting on 2013-8-25 at 18:34. First, pump the copper-rich electrolyte mother liquor into the mixing tank, but not to full capacity. Stir and heat, gradually adding ordinary-grade copper oxide powder in the early stage to consume the large amount of sulfuric acid in the solution. As the acidity of sulfuric acid decreases, it becomes difficult for ordinary-grade copper oxide powder to dissolve completely; in such cases, active copper oxide powder can be used slowly to continue removing sulfuric acid from the solution. (There is a significant price difference between active copper oxide and ordinary-grade copper oxide, with ordinary-grade copper oxide needing to be purchased directly.) ； Active copper oxide can be purchased directly, or it can be prepared by first neutralizing and precipitating a copper sulfate solution with sodium hydroxide solution, followed by washing to remove sodium ions), with the pH strictly controlled at 3.5–4. Dilute with an appropriate amount of cold water, then slowly add hydrogen peroxide in an amount equal to twice the amount required to oxidize divalent iron to trivalent iron at a temperature of 50–60 degrees Celsius; stir for 30 minutes ； Compressed air is introduced into the solution while stirring continues, and the mixture is heated to a boil for 90 minutes; as a result, iron in the solution precipitates out as ferric hydroxide in its trivalent form. Stop the operation and let it stand to cool and settle (under normal conditions, these particles of ferric hydroxide precipitate are relatively large, so no coagulant is needed to achieve clarification). First, filter off the supernatant, then filter and wash the slurry to remove copper ions as thoroughly as possible. The wash water can be used for dilution next time, or it can be returned along with the supernatant to the copper electrolysis mother liquor. If there is a surplus, the supernatant can be concentrated to precipitate copper sulfate, which can then be stored; the solution remaining after the precipitation of copper sulfate can be reused as the electrolyte base solution. This method can remove iron from copper sulfate solutions to below 10PPM.

Can’t you remove iron from this low-copper liquid?