A method for producing rare earth carbonate fine particles, including, forming a reaction solution in which an alkyldimethylamine oxide compound having a structure represented by the following formula (1) or a methylmorpholine oxide compound is added to an aqueous solution containing rare earth ion and an excess amount of urea with respect to the rare earth ion, such that the compound is added in an addition amount of 10 to 200 mol % relative to the rare earth ion, and subjecting the reaction solution to hydrothermal treatment to produce rare earth carbonate fine particles. This provides a method for producing rare earth carbonate fine particles of submicron or less and having excellent dispersibility. ##STR00001##
wherein R represents an alkyl group of C1 to C14.

In one aspect, the disclosure relates to oxalic acid-based extraction methods for the preparation of a pregnant leach solution obtained from a loaded organic phase obtained from a solvent extraction system, i.e., a LOPSES, wherein the loaded organic phase comprises an organic solvent and at least one REE and/or CM, as well as pregnant leach solution products or compositions obtained by the disclosed methods. The disclosure further relates to methods for preparing a loaded organic phase using a solvent extraction system. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.

In one aspect, the disclosure relates to oxalic acid-based extraction methods for the preparation of a pregnant leach solution obtained from a loaded organic phase obtained from a solvent extraction system, i.e., a LOPSES, wherein the loaded organic phase comprises an organic solvent and at least one REE and/or CM, as well as pregnant leach solution products or compositions obtained by the disclosed methods. The disclosure further relates to methods for preparing a loaded organic phase using a solvent extraction system. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.

Methods and systems for the extraction of magnetic material from magnet containing material, and for extraction of rare earth elements (REEs) from the magnetic material are disclosed. An exemplary system includes a milling/washing unit for magnet containing material such as end-of-life motors, hard drives, partially deconstructed motors, magnet-containing end-of-life product, or parts thereof, and outputting magnetic components by exploiting magnetic properties of ferromagnetic and paramagnetic materials in the presence and absence of electromagnetic fields in conjunction with other physical properties such as size and density. The system also includes a chemical processing unit for receiving the magnetic components to extract rare earth elements in the material. Chemical processes are disclosed for separating rare earth elements from magnetic components.

Methods and systems for the extraction of magnetic material from magnet containing material, and for extraction of rare earth elements (REEs) from the magnetic material are disclosed. An exemplary system includes a milling/washing unit for magnet containing material such as end-of-life motors, hard drives, partially deconstructed motors, magnet-containing end-of-life product, or parts thereof, and outputting magnetic components by exploiting magnetic properties of ferromagnetic and paramagnetic materials in the presence and absence of electromagnetic fields in conjunction with other physical properties such as size and density. The system also includes a chemical processing unit for receiving the magnetic components to extract rare earth elements in the material. Chemical processes are disclosed for separating rare earth elements from magnetic components.

The present disclosure provides a method of increasing the rate of phase conversion and use of a carboxylate-containing substance. A method of increasing the rate of phase conversion in the course of preparing a rare earth hydroxycarbonate from a rare earth carbonate comprises: mixing a rare earth carbonate with an aqueous solution of a carboxylate-containing substance to obtain a slurry; and heating the slurry such that reactions proceed. The method of the present disclosure can improve the rate of conversion from a rare earth carbonate to a rare earth hydroxycarbonate.

The present disclosure provides a method of increasing the rate of phase conversion and use of a carboxylate-containing substance. A method of increasing the rate of phase conversion in the course of preparing a rare earth hydroxycarbonate from a rare earth carbonate comprises: mixing a rare earth carbonate with an aqueous solution of a carboxylate-containing substance to obtain a slurry; and heating the slurry such that reactions proceed. The method of the present disclosure can improve the rate of conversion from a rare earth carbonate to a rare earth hydroxycarbonate.

The present invention relates to a process for selectively capturing chemical elements from a polymetallic liquid sample.

The present invention relates to a process for selectively capturing chemical elements from a polymetallic liquid sample.

The present disclosure discloses a method for preparing rare earth oxide by recycling ammonia and carbon, comprising the steps of: (1) heating raw materials containing a first rare earth carbonate and a first rare earth oxide with microwave and calcining at 500-1000 C. for 20-120 min to obtain a second rare earth oxide and carbon dioxide; (2) reacting carbon dioxide with a first ammonia water to obtain a precipitant; (3) reacting the precipitant with rare earth chloride to obtain a second rare earth carbonate and ammonium chloride wastewater. In the method, calcination time is short, rare earth recovery rate, utilization rate of ammonia and carbon resources are high. The present disclosure also provides a use of a rare earth oxide in shortening calcination time and/or increasing rare earth yield.