Method for recycling nickel, cobalt and manganese from feed liquid containing nickel, cobalt and manganese

A method for recycling nickel, cobalt, and manganese from a feed solution containing nickel, cobalt, and manganese, comprising

• (1) subjecting the feed solution to a first extraction to obtain an aqueous phase 1 and an organic phase 1;
• wherein an extractant B used in the first extraction comprises one or a combination of at least two of a phosphorus extractant, a carboxylic acid extractant or an oxime extractant;
• the carboxylic acid extractant has the following structural general formula:
• wherein 10<m+n≤22, and —CnH2n+1 and —CmH2m+1 are each independently linear or branched alkyl with 1-21 carbon atoms;
• the extractant B has a volume fraction of 5-30%;
• the first extraction comprises single-stage extraction or multi-stage countercurrent extraction;
• the extractant B used in the first extraction and the feed solution have a volume ratio of (0.1-10):1;
• the first extraction has a stirring speed of 100-250 r/min;
• the first extraction has a mixing time of 5-30 min;
• the multi-stage countercurrent extraction has 2-30 stages;
• (2) subjecting the aqueous phase 1 obtained in step (1) to a second extraction to obtain an organic phase 2 and an aqueous phase 2 with a pH value of 6-7.5;
• wherein an extractant A used in the second extraction is a carboxylic acid extractant;
• the carboxylic acid extractant has the following structural general formula:
• wherein 10≤m+n≤22, and —CnH2n+1 and —CmH2m+1 are each independently linear or branched alkyl with 1-21 carbon atoms;
• the extractant A has a volume fraction of 5-30%;
• the second extraction is multi-stage countercurrent extraction;
• the extractant A used in the second extraction and the aqueous phase 1 have a volume ratio of (0.1-10):1;
• the second extraction has a stirring speed of 100-250 r/min;
• the second extraction has a mixing time of 5-30 min;
• the multi-stage countercurrent extraction of the second extraction has 5-30 stages;
• and
• (3) subjecting the organic phase 2 obtained in step (2) to washing and back extraction in sequence to obtain a solution containing nickel, cobalt and manganese;
• wherein the washing is multi-stage countercurrent washing;
• the washing has 2-10 stages.