Recovery of neodymium, dysprosium, and cobalt from NdFeB magnet leachate using an unsymmetrical dialkylphosphinic acid extractant, INET-3

On-line quantification of solid-phase metal extraction efficiencies using instrumented millifluidics platform

“…A beam stop made of a circular tin plate (8) is located beneath the XRF chip. The glass reagent bottle in the background (9) contains the solution to be eluted in the column and the one in the forefront (10) is filled up with the output liquid (waste). (B) Real-life picture of the platform.…”

“…Indeed, lots of work has been done in the past few years focusing on the recovery of the elements commonly found in magnets, e.g. Neodymium-Iron-Boron magnets (NdFeB) [5][6][7][8][9][10][11][12] or electronic components that can be enriched in REEs, such as Nd-based capacitors [13].…”

Enrichment of Rare Earth from Wasted NdFeB Lotion with the Extraction-Precipitation Method

“…In addition to solvent extraction, chemical precipitation is another commonly used hydrometallurgical technology to recover REE secondary resources . Chemical precipitation is a simple and inexpensive method to recover REEs. , Unfortunately, the commonly used oxalate precipitant is toxic, and the precipitation particles formed by an ammonium bicarbonate precipitant are smaller; both of the precipitants cannot be reused during the separation process. Given the disadvantages of molten salt extraction, gas-phase extraction, solvent extraction, and chemical precipitation, a novel method, extraction-precipitation, has been developed for REE recovery in this laboratory.…”

“…18 Chemical precipitation is a simple and inexpensive method to recover REEs. 19,20 Unfortunately, the commonly used oxalate precipitant is toxic, and the precipitation particles formed by an ammonium bicarbonate precipitant are smaller; both of the precipitants cannot be reused during the separation process. In the process of extraction-precipitation, metal ions can be quantitatively extracted to form solid complexes without using an organic solvent or support; also, the extraction-precipitant can be effectively stripped and recycled.…”

Selective separation of cobalt and nickel using a stable supported ionic liquid membrane

“…To meet this growing demand, extraction and separation of cobalt from primary ( [6]) and secondary sources ( [7], [8]) has attracted much attention. The recycling of spent lithium-ion batteries and permanent magnets in view of cobalt recovery has been extensively studied recently ( [9], [10], [11], [12], [13], [14], [15]). Separation and microextraction of divalent cobalt ion are also an important issue for analytical chemistry purposes ( [16], [17], [18], [19]).…”