Removal of impurities with AgNO3
Thread Content
*The Ag acid solution contains low levels of iron and copper ions, and it is desired to remove these two types of impurity metal ions. *The solubility of Ag in AO acid is 500 g/L, while the concentrations of iron and copper are very low. Impurities are currently removed using filter bags and heating methods. Now we want to upgrade this process; we hope experts can provide some good suggestions. Or help us solve this problem. Thank you!
These two impurities, iron and copper, can be separated using membrane separation; do they exist in solid form or as ions? Different forms require different separation membranes
Sorry, I misread it; it can be removed using membrane filtration – nanofiltration can be used directly
For nanofiltration, the concentration of AgNO3 is very high, reaching 500 g Ag per liter of water; I’m not sure whether nanofiltration membranes will work in this case In addition, the iron ion content is 5 ppm, and that of copper is 25 ppm; it is desired to achieve 2.5 ppm for Fe and 2.5 ppm for copper after treatment
Add ammonia to adjust the pH value – pass steam to raise the temperature to 200 to 250 degrees Celsius (AGNO3 begins to crystallize) – dissolve the concentrate in hot water – filter – add HNO3 to adjust the pH value – electrolyze!