Process for selectively capturing chemical elements from a polymetallic sample

A process for capturing chemical elements M1, M2, M3, and optionally M4, contained in a liquid sample, said process comprising the following steps:

• a) contacting said liquid sample with at least one amine and optionally CO2, so as to obtain a first liquid phase, M1 in a solid form, and optionally M2 in a solid form,
• b) recovering said M1 in a solid form, and optionally said M2 in a solid form,
• c) contacting said first liquid phase with copper ions, so as to obtain a second liquid phase,
• d) contacting said second liquid phase with a carbonate and optionally a hydroxide, so as to obtain a third liquid phase, M3 in a solid form, optionally M4 in a solid form and optionally M2 in a solid form,
• e) recovering said M3 in a solid form, optionally said M4 in a solid form, and optionally said M2 in a solid form,
• said M2 in a solid form being recovered in step b) and/or step e),
• M1 being selected from the group consisting of iron, aluminum, titanium, a rare earth, an actinide, and a combination thereof,
• M2 being manganese, and
• M3 and M4 being each independently selected from the group consisting of nickel, cobalt, and a combination thereof.