Improving Extraction Performance of D2EHPA for Impurities Removal from Spent Lithium-Ion Batteries Leaching Solution by TPC[4]

Abstract

To reduce reagent consumption, wastewater discharge, and production cost of Mn 2+ recovery and impurities (Zn 2+ /Cu 2+ /Ca 2+ ) removal from an acid leaching solution of spent lithium-ion batteries, a mixed extractant (TPC[4]+D2EHPA) was synthesized, and the extraction performances for Mn 2+ and impurities were systematically investigated. The synthesis experimental results demonstrated that TPC[4] can be synthesized in a simple and high yield way with cheap raw materials. Extraction tests indicated that the separation coefficients of Mn 2+ , Cu 2+ , and Zn 2+ to Ni 2+ and Co 2+ by D2EHPA were significantly enlarged by the addition of TPC [4], which can mainly be attributed to the enhancement in the differences of binding abilities for cationic complexes with different sizes. Furthermore, the loading capacities of Mn 2+ and impurities (Cu 2+ , Zn 2+ ) were also enlarged, and the stripping of these cations could easily be achieved with dilute acid. Compared with traditional Mn 2+ and an impurities extraction process with D2EHPA alone, the addition of TPC[4] saved about 10.36% of the saponification alkali (NaOH), 10.36% of the washing acid (H 2 SO 4 ), ∼20% of the washing water, and more than 4.56% of the organic loss. From both economic and environmental perspectives, the mixed solvent of D2EHPA+TPC[4] is an excellent application prospect.

Carbon neutrality strategies for sustainable batteries: from structure, recycling, and properties to applications

“…170 extractants, mostly protonic acids, usually with chelating properties, and therefore classified as chelating extractants. D2EHPA, [171][172][173] Versatic 10, 174 Cyphos IL-101, 175 and Cyanex272 176,177 are excellent extractants with high extraction efficiency for Co, Ni and Mn ions. A mixture of more than two extractants can improve the recovery efficiency of Mn, Co, Ni and Li with significant synergistic effects due to the enhanced binding ability difference for cationic complexes of different sizes.…”

“…A mixture of more than two extractants can improve the recovery efficiency of Mn, Co, Ni and Li with significant synergistic effects due to the enhanced binding ability difference for cationic complexes of different sizes. 172,178 In the mid-term, researchers were focused on how to extract and dissolve materials efficiently. Therefore, various auxiliary means to achieve rapid dissolution of cathode materials have been reported, such as mechanochemical activation, 109,152,179,180 ultrasound assisted, 145,[181][182][183] and deep eutectic solvent.…”

“…A mixture of more than two extractants can improve the recovery efficiency of Mn, Co, Ni and Li with significant synergistic effects due to the enhanced binding ability difference for cationic complexes of different sizes. 172,178…”

Extraction Strategies from Black Alloy Leachate: A Comparative Study of Solvent Extractants

“…Contrary to the hydrometallurgical process, this pyrometallurgical process can be completed simply without the necessity of the pretreatment step. However, the pyrometallurgical process loses a portion of valuable metals in a form of slag or vapor [17][18][19]. Economic efficiency is also a crucial aspect of the recycling industry, with the economic efficiency of the pyrometallurgical process largely depending on the kinds of recovered metals [19,20].…”

Direct Extraction of Ni(II) from Acidic Polymetallic Sulfate Media with a Novel Synergistic Extraction System of DNNSA-MSL211

“…In addition, to improve the stability of the extracted complex, the extractant should also be able to form a chelating ring with Ni(II). In view of the above considerations and inspired by the structure of resins containing multiple pyridyl groups − and our previous investigation, a novel Ni(II) extractant, 3-(nonyloxy)- N , N -bis(pyridin-2ylmethyl)propan-1-amine (MSL211) with two pyridyl groups, was designed and synthesized.…”