& Which metals are suitable for extraction using your products?
P204 （D2EHPA）and P507(PC88A ) together for sulfate Nickle and Cobalt
Only use p204 could extract Zinc and Vanadium
ZD984 copper extractant mainly extract for Copper
Only use p507 could extract rare earth
& What are the conditions/ parameters to obtain optimal extraction/selectivity?
Actually ,different situation have different conditions/ parameters mainly based on your type of
raw material (black powder of lithium iron phosphate or Ternary lithium battery or other）
,Indian plant normally wrok as recycled ternary lithium battery as raw material for Nickle ,Cobalt
& Recommended concentration in the diluent, pH, temperature, number of separation stages?
P204 :diluent = 1:3
P507 :diluent =1:4 ;
PH: 3-5
Temperature:50-70℃ ，
Separation stage :5 stage
& Your product loading capacity ?
Pls refer to Isotherm curves as below
P507 Isotherm curves
p204 Isotherm curves
ZD984 copper extractant Isotherm curves
& What happens if saponification occurs?
P204 does not have strong surface activity, but after saponification or complexation with
the extracted ions, the surface activity is greatly enhanced and reverse micelles can be formed.
204 needs to be saponified with sodium hydroxide before use. During the extraction process of
saponified P204, the Na+ in the extractant will not only exchange with the metal ions in the feed
solution, but also exchange with the H+ in the feed solution, causing the pH value of the feed solution
to increase. However, the pH50 difference between manganese and cobalt is small, and the pH50
difference is only about 1. Therefore, during the extraction process, it is extremely important to control
the pH value of the feed solution, otherwise the co-extraction of cobalt during the manganese removal
process will be very serious.
& We have found it difficult to maintain the pH of solvents in a specific range.
How to do this efficiently?
a . Add alkali to an acidic solution with an acidity coefficient of 3-5 to obtain a buffer
solution with a pH value of 4-4.5.
b. Add the buffer solution from step (a) to the manganese removal solution, adjusting
the pH to 4.0-5.0 to ensure that the concentration of manganese ions is less than 6 g/L.
Use acid or alkali to adjust the pH to 3.8-4.2, resulting in a mixed solution.
c. Perform multi-stage extraction on the mixed solution from step (b) using an acidic extractant
solution to remove manganese ions from the manganese removal solution. The concentration of
the acidic extractant solution should be less than or equal to 0.4 mol/L. The ratio of the total
amount of the acidic extractant used in the multi-stage extraction to the amount of acidic solute
in the acid solution added to the manganese removal solution in step (b) should be 1:(5-10).
