Why is the separation of nickel in P507 not good?
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Nickel-cobalt separation: Why is P507 not effective for nickel separation? After purification with P204, the pH of the solution is between 4.0 and 4.5; the concentration of cobalt is 30–35 grams per liter, that of nickel is 1–2 grams per liter, and that of magnesium is 3–5 grams per liter. The organic concentration of P507 is 20%, while the saponification rate is 60–65%. The flow rate in the washing stage is high, and the magnesium concentration has been reduced to below 0.002 grams per liter. Then why is there still nickel present in the back-extraction stage?
Bro, have you found out what the problem is? I’ve run into this problem too
There is usually a trace amount of entrainment, and the nickel carried along can be washed away through the nickel washing stage.