Technique for preparing high-purity praseodymium from industrial praseodymium raw material

A process method and process technology, which is applied in the field of preparing high-purity praseodymium from industrial grade praseodymium raw materials, and achieves a good cohesive effect

Inactive Publication Date: 2014-01-22
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new process for preparing high-purity praseodymium with industrial-grade praseodymium raw materials for the shortcomings of the existing process for preparing high-purity praseodymium from industrial-grade praseodymium raw materials

Method used

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  • Technique for preparing high-purity praseodymium from industrial praseodymium raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Industrial grade praseodymium feed liquid

[0029] The industrial-grade praseodymium feed solution is a rare earth chloride aqueous solution with a rare earth concentration of 1.0 M and a pH value of 2.5. The mole fraction of cerium in the feed solution is 0.005, the mole fraction of praseodymium is 0.985, and the mole fraction of neodymium is 0.01.

[0030] (2) Organic phase

[0031] The organic phase is a kerosene solution of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (that is, P507), and the concentration of P507 is 1.0 M. In the cerium-praseodymium / praseodymium-neodymium separation process and the cerium / praseodymium separation process, the organic phase of the P507 extractant is saponified by conventional methods.

[0032] (3) Cerium-praseodymium / praseodymium-neodymium group separation fractionation extraction process

[0033] The group separation process of cerium-praseodymium / praseodymium-neodymium adopts a fractional distillation extraction system...

Embodiment 2

[0053] (1) Industrial grade praseodymium feed liquid

[0054] The industrial-grade praseodymium feed solution is a rare earth chloride aqueous solution with a rare earth concentration of 1.2 M and a pH value of 2.5. The mole fraction of cerium in the feed solution is 0.001, the mole fraction of praseodymium is 0.995, and the mole fraction of neodymium is 0.004.

[0055] (2) Organic phase

[0056] The organic phase is a kerosene solution of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (that is, P507), and the concentration of P507 is 1.2 M. In the cerium-praseodymium / praseodymium-neodymium separation process and the cerium / praseodymium separation process, the organic phase of the P507 extractant is saponified by conventional methods.

[0057] (3) Cerium-praseodymium / praseodymium-neodymium group separation fractionation extraction process

[0058] The group separation process of cerium-praseodymium / praseodymium-neodymium adopts a fractional distillation extraction syste...

Embodiment 3

[0078] (1) Industrial grade praseodymium feed liquid

[0079] The industrial-grade praseodymium feed solution is a rare earth chloride aqueous solution with a rare earth concentration of 1.5 M and a pH value of 3. The mole fraction of cerium in the feed solution is 0.005, that of praseodymium is 0.98, and that of neodymium is 0.015.

[0080] (2) Organic phase

[0081] The organic phase is a sulfonated kerosene solution of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (that is, P507), and the concentration of P507 is 1.5 M. In the cerium-praseodymium / praseodymium-neodymium separation process and the cerium / praseodymium separation process, the organic phase of the P507 extractant is saponified by conventional methods.

[0082] (3) Cerium-praseodymium / praseodymium-neodymium group separation fractionation extraction process

[0083] The group separation process of cerium-praseodymium / praseodymium-neodymium adopts a fractional distillation extraction system, with P507 as th...

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Abstract

The invention discloses a technique for preparing high-purity praseodymium from an industrial praseodymium raw material. According to the technique, a high-purity praseodymium (99.99%-99.9995%) product is prepared from industrial praseodymium (98%-99.9%). The technique consists of three fractional extraction systems: cerium-praseodymium/praseodymium-neodymium grouping separation, cerium/praseodymium separation and praseodymium/neodymium separation, wherein separation of cerium-praseodymium from neodymium is realized in an extraction section of the cerium-praseodymium/praseodymium-neodymium fractional extraction system; separation of cerium from praseodymium-neodymium is realized in a washing section of the cerium-praseodymium/praseodymium-neodymium fractional extraction system; the cerium/praseodymium separation fractional extraction system is directly serially connected to the praseodymium/neodymium separation fractional extraction system. Compared with an existing technique, the technique has the advantages that alkali consumption (including alkali for saponification and alkali for neutralization) is reduced by 13%, and acid consumption (including acid for washing and acid for reextraction) is reduced by 13%.

Description

technical field [0001] The invention relates to a process method for preparing high-purity praseodymium from industrial-grade praseodymium raw materials, in particular to a process method for preparing high-purity praseodymium products by first separating cerium-praseodymium / praseodymium-neodymium into groups, and then separating cerium / praseodymium in series with praseodymium / neodymium. Background technique [0002] Praseodymium is an extremely important light rare earth element, and its products are widely used in precision ceramics, special glass, rare earth permanent magnet materials, hydrogen storage materials, alloy materials and other fields. Compared with industrial-grade praseodymium products, high-purity praseodymium products have better application performance. [0003] The main raw materials for separation and extraction of praseodymium are bastnaesite and ion-adsorbed rare earth ores, and the main method for separation and extraction is P507 solvent extraction. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/40
CPCY02P10/20
Inventor 钟学明傅毛生
Owner NANCHANG HANGKONG UNIVERSITY
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