The present invention provides an N,N-dihydrocarbonyl amide carboxylic acid, preparation method therefor and use thereof. The N,N-dihydrocarbonyl amide carboxylic acid can be used as an extractant for enriching rare earth elements from raw materials containing low-concentration rare earth elements, separating and purifying yttrium element from mixed rare earth raw material, and separating elements such as aluminum, iron, radioactive thorium, radioactive uranium and actinide from mixed rare earth raw material, etc. The compound can be synthesized in a simple and cost-efficient way. As an extractant, it has good chemical stability and can withstand strong acid and strong alkali without decomposition.

The present invention provides an N,N-dihydrocarbonyl amide carboxylic acid, preparation method therefor and use thereof. The N,N-dihydrocarbonyl amide carboxylic acid can be used as an extractant for enriching rare earth elements from raw materials containing low-concentration rare earth elements, separating and purifying yttrium element from mixed rare earth raw material, and separating elements such as aluminum, iron, radioactive thorium, radioactive uranium and actinide from mixed rare earth raw material, etc. The compound can be synthesized in a simple and cost-efficient way. As an extractant, it has good chemical stability and can withstand strong acid and strong alkali without decomposition.

Provided are a carboxylic acid compound of formula I, and a preparation method therefor and application thereof. When being applied to the extraction and separation of metal ions, the carboxylic acid compound can achieve a high separation coefficient, low back extraction acidity, high load rate, high back extraction rate, high stability, and low water solubility, so that the extraction process is stable, and environmental pollution and components can be reduced. The present application can be used in various systems such as ternary battery recycling and battery-grade nickel sulfate preparation.

Provided are a carboxylic acid compound of formula I, and a preparation method therefor and application thereof. When being applied to the extraction and separation of metal ions, the carboxylic acid compound can achieve a high separation coefficient, low back extraction acidity, high load rate, high back extraction rate, high stability, and low water solubility, so that the extraction process is stable, and environmental pollution and components can be reduced. The present application can be used in various systems such as ternary battery recycling and battery-grade nickel sulfate preparation.

A method for producing mixed metal salts containing manganese ions and at least one of cobalt ions and nickel ions, the method including: an Al removal step of subjecting an acidic solution containing at least manganese ions and aluminum ions, and at least one of cobalt ions and nickel ions, to removal of the aluminum ions by extracting the aluminum ions into a solvent, the acidic solution being obtained by subjecting battery powder of lithium ion batteries to a leaching step; and a precipitation step of neutralizing an extracted residual liquid obtained in the Al removal step under conditions where a pH is less than 10.0, to precipitate mixed metal salts comprising a metal salt of manganese and a metal salt of at least one of cobalt and nickel.

The present invention relates to metallurgical processes, and more particularly to a process for producing titaniferous feedstock and fines, a process for agglomerating titaniferous fines, and a process for producing titaniferous metals and titaniferous alloys. Recovery of rare-earth, vanadium and scandium from titanium iron bearing resources is also disclosed. Selective leaching for Scandium recovery from all magnetite type resources such as ilmenite, ferro titanic resources, nickel laterites, magnetite iron resources etc.

Provided are processes for extracting lithium and optionally nickel from a Nickel(II)/Lithium(I) (Ni.sup.2+/Li.sup.+) solution. The extraction is optionally performed in a series of steps with counterflow of aqueous and organic flows to thereby produce a lithium poor solution. The lithium poor solution may be treated so that remaining Ni in the lithium poor solution may be directly precipitated therefrom in the form of a Ni salt. Once complete, the process provides for recoverable nickel and/or lithium that may be recycled into batteries or sold for other uses.

This invention has an object to provide a method for producing a beryllium solution by dissolving beryllium oxide, the method being novel and having high energy efficiency. A production method (M10) for producing a beryllium solution includes a main heating step (S13) of dielectrically heating an acidic solution containing beryllium oxide to generate a beryllium solution.

Rare earth extractant compounds having the following structure:

##STR00001##

wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently selected from alkyl groups containing 1-30 carbon atoms and optionally containing an ether or thioether linkage connecting between carbon atoms, provided that the total carbon atoms in R.sup.1, R.sup.2, R.sup.3, and R.sup.4 is at least 12; R.sup.5 and R.sup.6 are independently selected from hydrogen atom and alkyl groups containing 1-3 carbon atoms; and provided that at least one of the conditions (i)-(iv) apply as follows: presence of a distal branched group in at least one of R.sup.1-R.sup.4 (condition i), asymmetry in R.sup.1-R.sup.4 (condition ii), presence of amine-containing ring (condition iii), or presence of lactam ring (condition iv). Also described are hydrophobic water-insoluble solutions containing at least one extractant compound of Formula (1), as well as method for extracting rare earth elements from aqueous solution by contacting the aqueous solution with the water-insoluble solution.

A dissymmetric RN,N-dialkylamides of formula (I) in which: R.sup.1 represents a linear C.sub.1 to C.sub.4 alkyl, R.sup.2 represents a linear C.sub.1 to C.sub.10 alkyl, and R.sup.3 represents a linear or branched C.sub.6 to C.sub.15 alkyl, where R.sup.3 is different from a n-octyl, n-decyl, n-dodecyl, 2-ethylhexyl and 2-ethyloctyl group when R.sup.1 represents a n-butyl group and R.sup.2 represents an ethyl group. A method for synthesising the N,N-dialkylamides, and uses of same for extracting uranium and/or plutonium from an aqueous acid solution or for fully or partially separating the uranium from the plutonium contained in an aqueous acid solution and a solution resulting from the dissolution of spent nuclear fuel in nitric acid. A method for treating an aqueous solution resulting from the dissolution of spent nuclear fuel in nitric acid, which allows the uranium and the plutonium contained in the solution to be extracted, separated and decontaminated in a single cycle.