A treatment method and application for laterite nickel ore leaching solution with high calcium and magnesium content, comprising the following steps: S1. preparing an extracted organic phase from the 2-hexyldecanoic acid and the HBL110/HBL116 extractant; S2. performing nickel-cobalt co-extraction on the extracted organic phase and a laterite nickel ore leaching solution with a high calcium and magnesium content to obtain a first loaded organic phase and a raffinate; in a laterite nickel ore leaching solution with a high calcium and magnesium content; S3. washing the first loaded organic phase with a washing solution to obtain a second loaded organic phase and washing water, wherein the washing water is refluxed to a laterite nickel ore leaching solution with high calcium and magnesium content; S4. adding a reverse extracting solution to the second loaded organic phase for reverse extracting to obtain a nickel-cobalt salt solution and a reverse extracted organic phase; S5. saponifying the reverse extracted organic phase to obtain a regenerated extracted organic phase; this scheme is applicable to the environment with high calcium and magnesium, can prevent calcium and magnesium from forming a third phase, and the effect of separating and purifying nickel and cobalt is good.

A treatment method and application for laterite nickel ore leaching solution with high calcium and magnesium content, comprising the following steps: S1. preparing an extracted organic phase from the 2-hexyldecanoic acid and the HBL110/HBL116 extractant; S2. performing nickel-cobalt co-extraction on the extracted organic phase and a laterite nickel ore leaching solution with a high calcium and magnesium content to obtain a first loaded organic phase and a raffinate; in a laterite nickel ore leaching solution with a high calcium and magnesium content; S3. washing the first loaded organic phase with a washing solution to obtain a second loaded organic phase and washing water, wherein the washing water is refluxed to a laterite nickel ore leaching solution with high calcium and magnesium content; S4. adding a reverse extracting solution to the second loaded organic phase for reverse extracting to obtain a nickel-cobalt salt solution and a reverse extracted organic phase; S5. saponifying the reverse extracted organic phase to obtain a regenerated extracted organic phase; this scheme is applicable to the environment with high calcium and magnesium, can prevent calcium and magnesium from forming a third phase, and the effect of separating and purifying nickel and cobalt is good.

A treatment method and application for laterite nickel ore leaching solution with high calcium and magnesium content, comprising the following steps: S1. preparing an extracted organic phase from the 2-hexyldecanoic acid and the HBL110/HBL116 extractant; S2. performing nickel-cobalt co-extraction on the extracted organic phase and a laterite nickel ore leaching solution with a high calcium and magnesium content to obtain a first loaded organic phase and a raffinate; in a laterite nickel ore leaching solution with a high calcium and magnesium content; S3. washing the first loaded organic phase with a washing solution to obtain a second loaded organic phase and washing water, wherein the washing water is refluxed to a laterite nickel ore leaching solution with high calcium and magnesium content; S4. adding a reverse extracting solution to the second loaded organic phase for reverse extracting to obtain a nickel-cobalt salt solution and a reverse extracted organic phase; S5. saponifying the reverse extracted organic phase to obtain a regenerated extracted organic phase; this scheme is applicable to the environment with high calcium and magnesium, can prevent calcium and magnesium from forming a third phase, and the effect of separating and purifying nickel and cobalt is good.

A treatment method and application for laterite nickel ore leaching solution with high calcium and magnesium content, comprising the following steps: S1. preparing an extracted organic phase from the 2-hexyldecanoic acid and the HBL110/HBL116 extractant; S2. performing nickel-cobalt co-extraction on the extracted organic phase and a laterite nickel ore leaching solution with a high calcium and magnesium content to obtain a first loaded organic phase and a raffinate; in a laterite nickel ore leaching solution with a high calcium and magnesium content; S3. washing the first loaded organic phase with a washing solution to obtain a second loaded organic phase and washing water, wherein the washing water is refluxed to a laterite nickel ore leaching solution with high calcium and magnesium content; S4. adding a reverse extracting solution to the second loaded organic phase for reverse extracting to obtain a nickel-cobalt salt solution and a reverse extracted organic phase; S5. saponifying the reverse extracted organic phase to obtain a regenerated extracted organic phase; this scheme is applicable to the environment with high calcium and magnesium, can prevent calcium and magnesium from forming a third phase, and the effect of separating and purifying nickel and cobalt is good.

The present application provides an N,N-dihydrocarbonyl amino carboxylic acid, preparation method therefor and use thereof. The N,N-dihydrocarbonyl amino 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 a mixed rare earth raw material, and separating elements such as aluminum, iron, radioactive thorium, radioactive uranium and actinide from a 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 has good resistance against strong acid and strong alkali without decomposition.

The present application provides an N,N-dihydrocarbonyl amino carboxylic acid, preparation method therefor and use thereof. The N,N-dihydrocarbonyl amino 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 a mixed rare earth raw material, and separating elements such as aluminum, iron, radioactive thorium, radioactive uranium and actinide from a 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 has good resistance against strong acid and strong alkali without decomposition.

The present invention provides an N,N-dihydrocarbyl amide carboxylic acid, preparation method therefor and use thereof. The N,N-dihydrocarbyl 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-dihydrocarbyl amide carboxylic acid, preparation method therefor and use thereof. The N,N-dihydrocarbyl 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 secondary amide contained in the extraction system consists of a single compound or a mixture of two or more compounds, wherein R.sub.1 is selected from a C2C12 alkyl, or a C3C12 cycloalkyl containing a single-ring structure, R.sub.2 is selected from a C1C11 alkyl, or a C3C11 cycloalkyl containing a single-ring structure; the total number of carbon atoms in the molecule is 1218. With a volume ratio of an organic phase and a brine phase being 110:1, at a brine density of 1.251.38 g/cm.sup.3 and at a temperature of 050 C., a single-stage or multi-stage countercurrent extraction and a stripping are conducted to obtain a water phase with a low magnesium-lithium ratio, which is subjected to concentration, impurity removal and preparation to get lithium chloride, lithium carbonate and lithium hydroxide respectively. Water is used for stripping, greatly reducing the consumption of acid and base, and the separation process is shortened.

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.