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Extraction separation method for heavy rare earth elements

A separation method and technology of rare earth elements, applied in the field of extraction, can solve problems such as difficult back extraction and easy precipitation of heavy rare earth extracts, and achieve the effects of improving the extraction separation coefficient, good interface phenomena, and saving acid and alkali consumption

Active Publication Date: 2014-12-10
XIAMEN INST OF RARE EARTH MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, stripping is still difficult when the ratio of C272 is low, and heavy rare earth extracts are easy to precipitate when the ratio of C272 is high

Method used

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  • Extraction separation method for heavy rare earth elements
  • Extraction separation method for heavy rare earth elements
  • Extraction separation method for heavy rare earth elements

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Take 2,4,4-trimethylpentylphosphonic acid-2,4,4-trimethylpentyl ester and bis(2,4,4-trimethylpentyl)phosphonic acid (Code C272), to The volume ratio is 0.5:0.5 to form a mixed extractant. It is mixed with sulfonated kerosene to form an organic phase, and the volume ratio of the mixed extractant to sulfonated kerosene in the organic phase is 0.1:0.9.

[0069] Take the Tm-Yb-Lu enrichment, add concentrated hydrochloric acid, and prepare a raw material solution, the composition of which is ΣREO=0.036 mol / L, HCl=0.20 mol / L, Tm:Yb:Lu=10:80:10.

[0070] The organic phase with a volume ratio of 1:1 was mixed with the raw material solution, extracted at room temperature for 10 minutes, and the extraction stage was 1 stage. After the extraction is completed, the adjacent element separation coefficient β is calculated by the method of the present invention, and it can be known that under the current conditions, the separation coefficient β of the mixed extractant to Tm and Yb Y...

Embodiment 2

[0080] Prepare the organic phase: take 2,4,4-trimethylpentylphosphonic acid-2,4,4-trimethylpentyl ester, di(2,4,4-trimethylpentyl)phosphonic acid and trimethylpentylphosphonic acid (2,4,4-trimethylpentyl) phosphate, the volume ratio is 0.45:0.45:0.10 to form a mixed extractant. It is mixed with sulfonated kerosene to form an organic phase, and the volume ratio of the mixed extractant to sulfonated kerosene in the organic phase is 0.45:0.55.

[0081] Preparation of raw material solution: take the Yb-Lu enrichment, add concentrated hydrochloric acid to dissolve at a solid-to-liquid ratio of 10:1.5, and prepare a raw material solution, the composition of which is ∑REO=1.2 mol / liter, pH=1, Yb:Lu=10: 1.

[0082] Fractional extraction and back extraction: Fractional extraction and back extraction are carried out in a 0.25L mixing and settling tank, and the residence time of the aqueous phase and the organic phase in the mixing chamber is 8 minutes. The number of extraction stages ...

Embodiment 3

[0084] Prepare the organic phase: take 2,3,4-trimethylpentylphosphonic acid-2,3,4-trimethylpentyl ester, di(2,3,4-trimethylpentyl)phosphonic acid and trimethylpentylphosphonic acid (2,3,4-trimethylpentyl) phosphate, the volume ratio is 0.45:0.45:0.10 to form a mixed extractant. It is mixed with sulfonated kerosene to form an organic phase, and the volume ratio of the mixed extractant to sulfonated kerosene in the organic phase is 0.3:0.7.

[0085] Prepare the raw material solution: take the scandium enrichment recovered from the tailings of the southern ion-type mine, of which scandium oxide accounts for 85%, and the impurities are mainly heavy rare earths. The scandium enriched material is dissolved in nitric acid at a solid-to-liquid ratio of 10:1.5 to prepare a raw material solution, the composition of which is ∑REO=0.35 mol / liter and pH=0.5.

[0086] Fractional extraction and back-extraction: Fractional extraction and back-extraction are carried out in a 0.25L mixed-settl...

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Abstract

The invention provides an extraction separation method for heavy rare earth elements. The extraction separation method comprises the following steps: mixing rare earth concentrates with inorganic acid to obtain a raw material liquid; mixing an extraction agent with a thinning agent to obtain an organic phase; using the organic phase to extract rare earth elements in the raw material liquid, wherein the extraction agent is the mixture of alkyl phosphonic monoalkyl ester and dialkyl hypophosphorous acid. By taking the mixture of alkyl phosphonic monoalkyl ester and dialkyl hypophosphorous acid as the extraction agent, the selectivity for rare earth elements is high, and the extraction agent is combined with the inorganic acid and the thinning agent, so that the separation coefficient for the rare earth elements, particularly adjacent rear earth elements, are improved, and reverse extraction is easy.

Description

technical field [0001] The invention relates to the technical field of extraction, in particular to an extraction and separation method of heavy rare earth elements. Background technique [0002] Rare earth elements refer to the lanthanide elements with atomic number 57-71 and yttrium with atomic number 39. Today, rare earth elements are widely used in luminescent materials, electronic communications, magnetic materials, metallurgy, ceramics and other fields. According to the atomic electron layer structure and physical and chemical properties of rare earth elements, as well as their symbiosis in minerals and different ionic radii that can produce different properties, the seventeen rare earth elements are usually divided into two groups: light rare earths and heavy rare earths. [0003] Heavy rare earths are called "super industrial monosodium glutamate", mainly including gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium. Since the...

Claims

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Application Information

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IPC IPC(8): C22B3/38C22B59/00
CPCY02P10/20
Inventor 孙晓琦王艳良郭向广
Owner XIAMEN INST OF RARE EARTH MATERIALS
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