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Method for extracting and separating rare earth elements in sulfuric acid system

A separation method and technology for rare earth elements, applied in the field of extraction, can solve the problems of difficult stripping of medium and heavy rare earths, high residual acid in stripping liquid, large consumption of acid and alkali, and achieve good interface phenomenon, low extraction acidity, and acid consumption. less effect

Inactive Publication Date: 2013-01-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, P204 is easy to produce emulsification when the acidity of the feed liquid is low, but the medium-heavy rare earth stripping is very difficult, the residual acid in the stripping liquid is high, and the acid-base consumption is large (Chinese patent ZL85102210)
Although under high acid conditions (>2mol / L), P507 and P204 can use the P=O bond in their molecules to extract rare earth ions under non-saponification conditions, but there are also problems of high acid-base consumption and low extraction efficiency.

Method used

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  • Method for extracting and separating rare earth elements in sulfuric acid system
  • Method for extracting and separating rare earth elements in sulfuric acid system
  • Method for extracting and separating rare earth elements in sulfuric acid system

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Potassium hydroxide (8.4g, 0.15mol) was dissolved in 42ml ethanol and added dropwise to [C 25 h 54 N][Cl] (40g, 0.1mol), stirred at room temperature for 1 hour, filtered off the precipitated potassium chloride, and obtained clear [C 25 h 54 N][OH] ionic liquid.

[0045] To the prepared [C 25 h 54 Add 2-ethylhexyl mono-2-ethylhexylphosphonic acid (P507) (0.08mol) to N][OH] (0.1mol), stir at room temperature for 2 hours, take the upper ionic liquid organic phase, and wash with deionized water for 3 time, and then reclaim the solvent ethanol by distillation under reduced pressure, and the product methyl trioctyl ammonium 2-ethylhexyl mono-2-ethylhexylphosphonic acid ionic liquid [A336][P507].

Embodiment 2

[0047] Effect of solution equilibrium pH on distribution ratio of single rare earth ions in [A336][P507] extraction.

[0048] 1.0mL0.05mol / L [A336][P507]n-heptane solution and 4.0mL containing Na 2 SO 4 Mix with an aqueous solution of La(III), where Na in the aqueous solution 2 SO 4 Concentration is 1.0mol / L, La(III) concentration is 7.5×10 -4 mol / L, shake at a constant temperature of 25°C for 0.5h, and measure the equilibrium pH value of the water phase after shaking and the corresponding concentration of La(III) in the water phase. Calculate the extraction partition ratio. When the solution equilibrium pH value is different, the extraction distribution ratio will change.

Embodiment 3~16

[0050] Using the same extraction method as in Example 2, Ce(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III), Dy(III) were obtained respectively ), Ho(III), Er(III), Tm(III), Yb(III), Lu(III) and Y(III) extraction distribution ratio, that is, the distribution ratio of different rare earth ions at different pH values. figure 1 When [A336][P507] is used as the extractant, the dot plot of the equilibrium pH value of the solution and the extraction distribution ratio of rare earth ions can be seen from the figure, when the equilibrium pH value increases, the distribution ratio of rare earth ions increases. It is obtained by measuring the equilibrium pH value, and the equilibrium pH value is in the range of 1 to 7, and various rare earth ions can complete the extraction process, and the extraction acidity of the extraction agent is relatively low. The calculated average separation coefficient of rare earth elements is 1.36.

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Abstract

The invention provides a method for extracting and separating rare earth elements in a sulfuric acid system. The method includes the steps: taking mono (2-ethylhexyl) phosphonate 2-ethylhexyl methoxy cinnamate trialkyl methyl ammonium as an extracting agent; taking normal heptane as diluent; and extracting the rare earth elements in rare earth sulfate water solution into the normal heptane. The extracting agent used in the method does not need to be saponified, extraction and reverse extraction acidity is low, and separation coefficient for the rare earth elements is high.

Description

technical field [0001] The invention relates to the technical field of extraction, in particular to an extraction and separation method of rare earth elements in a sulfuric acid system. Background technique [0002] Rare earth elements refer to lanthanide elements with atomic numbers 57-71, scandium with atomic numbers 21 and yttrium with atomic numbers 39. Today, rare earth elements are widely used in luminescent materials, electronic communications, magnetic materials, metallurgy, ceramics and other fields. And various rare earth elements are mixed in the mineral deposits, such as: bastnaesite, monazite, xenotime and oil shale. Therefore, in order to obtain a single rare earth element, the extraction and separation of rare earth elements has been widely studied and applied. Due to the similar physical and chemical properties of rare earth elements, it is difficult to separate them. The solvent extraction separation method has the advantages of large processing capacity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/40C22B59/00
CPCY02P10/20
Inventor 陈继沈璐兰景波
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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