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Electrolytic reduction process of preparing bivalent europium

A process, trivalent europium technology, applied in the field of electrolytic reduction to prepare divalent europium, can solve problems such as unsatisfactory process conditions, clogging of porous carbon cathodes, inability to perform electrolysis, etc., to improve reduction current efficiency, prolong life, and long life. Effect

Inactive Publication Date: 2003-11-05
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the 1960s, mercury cathode electrolysis and porous carbon cathode electrolysis have appeared successively. However, due to the serious harm of mercury to the environment, the pores of the porous carbon cathode are clogged, and electrolysis cannot be carried out.
[0004] At present, there is a method for preparing divalent europium by electrolytic reduction, but the process conditions for preparing divalent europium by electrolytic reduction are not very ideal, for example, the entire electrolytic system, the material selection of the electrode, the electrode area, and the corresponding process parameters, etc., need to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The experiment was carried out in a square electrolytic reduction cell consisting of a cathode chamber and two anode chambers.

[0029] The cathode chamber and the anode chamber are separated by an ion exchange membrane, and there are two cathode chambers and two anode chambers. The distance between the ion exchange membranes is 116mm, the width of the electrolytic cell is 100mm, the solution in the cathode chamber is stirred with a stirring paddle, and the top is covered with kerosene or liquid paraffin or foam plastic, and the effective area of ​​the plate is 60×100×2mm 2 .

[0030] Analysis method: Eu 2+ It was determined by iodometric method; the total amount of rare earth was determined by EDTA volumetric method; the acidity was determined by neutralization method.

[0031] Cathode: Porous titanium plate; Anode: Titanium-coated iridium-ruthenium plate; Membrane material: AM-203 negative membrane.

[0032] Using a current density of 750A / m 2 , Feed liquid Eu 3+...

Embodiment 2

[0034] With embodiment 1, wherein feed liquid Eu 3+ 0.5mol / L, H + The concentration is 0.8mol / L, and the anolyte HCl is 0.5mol / L. The reduction rate is greater than 99%, and the reduction time is 150 minutes.

[0035] Compared with Example 1, the acidity of the feed solution in Example 2 is increased, which increases the acidity of the feed solution to reduce the current efficiency and prolong the reduction time.

Embodiment 3

[0037] With embodiment 1, wherein feed liquid Eu 3+ Concentration is 0.9mol / L, H + The concentration is 1.0mol / L, and the anolyte HCl is 0.5mol / L. The reduction rate was 99%, and the reduction time was 170 minutes.

[0038] In this embodiment, the concentration of the feed liquid is increased, and increasing the concentration of the feed liquid can improve the current efficiency.

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Abstract

The electrolytic reduction process for preparing bivalent europium includes using net coated with titanium or plated with noble metal as anode, titanium net or porous titanium plate as cathode, RE solution containing europium chloride as cathode solution, hydrochloric acid or hydrochloric acid plus sodium chloride solution as anode solution, and ion exchange film to separate the anode chamber andthe cathode chamber. The electrolytic reduction process is performed under the said conditions to prepare bivalent europium. The present invention has the advantages of reasonable electrolytic system, high reduction current efficiency, etc.

Description

technical field [0001] The invention relates to a process for preparing divalent europium through electrolytic reduction. Background technique [0002] As an activator for fluorescent and luminescent materials, europium oxide is widely used in color TV, lighting, laser, electronics and other fields. With the rapid development of large-screen high-definition color TV, high-resolution computer terminal display, and projection TV, europium-containing fluorescent The amount of red powder will increase substantially, and the demand for phosphor will still grow rapidly in the future. Since europium is the most easily reduced divalent element among the rare earth elements, and divalent europium is significantly different from trivalent rare earth elements, the reduction method can be used to extract europium oxide. Zinc pollutes the product, and the electrolytic reduction method is the most researched at present. [0003] Since the 1960s, mercury cathode electrolysis and porous c...

Claims

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Application Information

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IPC IPC(8): C25B1/00C25B9/00C25B15/00C25C1/22
Inventor 龙志奇黄文梅黄小卫张国成
Owner GRIREM ADVANCED MATERIALS CO LTD
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