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Electrochemical recovery method of heavy rare earth metals

A recycling method and heavy rare earth technology, which can be used in optics, process efficiency improvement, instruments, etc., and can solve problems such as recycling

Active Publication Date: 2019-06-07
蔚山大学产学合作部
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The object of the present invention is to overcome the previous technical difficulties that heavy rare earth metals cannot be electrochemically recovered from solutions containing heavy rare earths due to low reduction potential, and can be electrochemically recovered from solutions containing heavy rare earth metals. Method for recovering heavy rare earth metals

Method used

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  • Electrochemical recovery method of heavy rare earth metals
  • Electrochemical recovery method of heavy rare earth metals

Examples

Experimental program
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Effect test

Embodiment

[0056] Example: Three-electrode electrolytic reduction (electrolytic reduction) system

[0057] The three-electrode electrolytic reduction system used in the present invention includes a potentiostat (Potentiostat), a working electrode, a counter electrode, a reference (Reference) electrode and RE-Cl solution (Rare Earth (Rare Earth)-chloride solution) as a sample . figure 1 is a schematic diagram of a three-electrode electrolytic reduction system, figure 1 Part (a) is a schematic diagram of a three-electrode electrolytic reduction system using titanium foil as a working electrode, figure 1 Part (b) is a schematic diagram of the working electrode. The potentiostat used in the present invention is Iviumstat and Gamry equipment, in three electrodes, has used titanium rod (Titanium rod, (r=5mm, l=2mm)) or titanium foil (2mm * 2mm) as working electrode, As the counter electrode, a platinum mesh electrode (Platinum meshelectrode) was used, and as the reference electrode, an accu...

experiment example 1

[0061]Experimental example 1: Cyclic voltage and current experiment based on complexing agents

[0062] The complexing agent is an organic compound combined with metal ions in a circular arrangement structure. The complexing agent to be used in the three-electrode electrolytic reduction system ensured in Example 1 is glycine, ethylenediaminetetraacetic acid, imino Diacetic acid and nitrilotriacetic acid. And 2M of the above-mentioned complexing agent was used. The pH of the basic solution (a mixed solution of hydrochloric acid and distilled water) was fixed at 1, and RECl was added to the above basic solution 3 .6H 2 O powder to prepare RE-Cl solution. As the heavy rare earth metal ions in the RE-Cl solution, erbium, thulium, and ytterbium were used, and the concentrations of the respective metal ions were set to 1M. The titanium rod was used as the working electrode, and as the control group, the experiment was carried out under the same conditions except that no complexi...

experiment example 2

[0071] Experimental example 2: Cyclic voltage and current experiment based on pH conditions

[0072] Except that KOH is used to adjust the pH of the RE-Cl solution and the heavy rare earth metal ions of the RE-Cl solution are fixed as erbium, all other conditions are the same as those of the complexing agent-based cyclic voltage-current experiment in Experimental Example 1. The RE-Cl solution used in the present invention is the simulated solution of mineral waste water, thereby although initial waste water has acidity, but considering carrying out neutralization treatment, the reduction situation of the erbium when pH is 1 and 7 has been observed, and for For comparison, a reduction experiment of erbium at a pH of 12 was carried out.

[0073] Figure 6a , Figure 6b and Figure 6c Respectively represent the current density based on the complexing agent measured by cyclic voltammetry when the heavy rare earth metal ion is erbium when the pH is 1, 7 and 12, respectively.

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Abstract

The present invention solves an existing technical serious problem in which it is impossible to electrochemically recover heavy rare earth metals from waste including heavy rare earths due to low reduction potential. The present invention adds a complexing agent to industrial waste including the heavy rare earth metals; thereby forming a heavy rare earth metal ion-ligand complex compound between heavy rare earth metal ions and the complexing agent, and metalizes and recovers the heavy rare earth metal ions through an electrochemical method, thus being able to recover environmentally friendly heavy rare earth metals at a high recovery rate from the industrial waste including the heavy rare earth metals.

Description

technical field [0001] The invention relates to a method for electrochemically reclaiming heavy rare earth metals from a solution containing heavy rare earth metals, more specifically, to adding a complexing agent to various industrial solutions containing heavy rare earth metals. A heavy rare earth metal ion-ligand complex is formed between the metalloid ion and the complexing agent, thereby recovering the heavy rare earth metal by electrolytic reduction. Background technique [0002] Rare earth metals is a general term for trace elements used in cutting-edge industries including power generators and next-generation batteries. The earth's crust contains a very small amount of rare earth metals. Currently, China supplies a considerable amount of rare earth metals, but it has a tendency to be weaponized like oil. Therefore, many developed countries are making efforts to find new resource suppliers while paying attention to the development of a method for reusing rare earth m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/22
CPCC25C1/22Y02P10/20
Inventor 金善正
Owner 蔚山大学产学合作部
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