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Method for reducing rare earth oxide into rare earth metal elementary substance in chloride molten salt system

A rare earth oxide and rare earth metal technology, which is applied in the field of rare earth smelting and spent fuel reprocessing, can solve the problems of interruption of redox reaction, increase in energy and material cost, etc., and achieves the effect of reducing electrolysis temperature, simple operation and solving high temperature

Active Publication Date: 2021-02-23
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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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 method for reducing rare earth oxides to simple rare earth metals in a chloride molten salt system, so as to solve the problem of rising energy and material costs in the FFC Cambridge method in the prior art due to the high temperature of the molten salt. and the problem of interrupted redox reactions

Method used

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  • Method for reducing rare earth oxide into rare earth metal elementary substance in chloride molten salt system
  • Method for reducing rare earth oxide into rare earth metal elementary substance in chloride molten salt system
  • Method for reducing rare earth oxide into rare earth metal elementary substance in chloride molten salt system

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Embodiment 1

[0026] According to this preferred embodiment, there is provided a method for reducing rare earth oxides to simple metals in a chloride molten salt system, comprising the following steps: Grinding: take 2g Sm 2 o 3 Add 2wt% polyethylene glycol for grinding; drying: drying the ground material; tableting: pressing the dried material into a green body; sintering: putting the green body into a muffle furnace at 650 ° C After sintering for 8h, the Sm 2 o 3 is the solidified body of the matrix; cathode preparation: the sintered Sm 2 o 3 The solidified body is punched and fixed and bound with a wire to obtain the cathode; electrolysis: insert the prepared cathode into a molten state LiCl(42g)-KCl(58g)-Li 2 In a crucible of O (0.1wt%) molten salt, graphite was used as an anode at 550° C. for 12 hours by constant cell voltage method (3.00 V).

[0027] Characterization: The electrolysis product was washed with water and dried, and the dried product was analyzed by XRD. like figu...

Embodiment 2

[0029] A method for reducing rare earth oxides to simple metals in a chloride molten salt system, comprising the following steps: Grinding: taking 2g Gd 2 o 3 Add 3wt% polyethylene glycol for grinding; drying: drying the ground material; tableting: pressing the dried material into a green body; sintering: putting the green body into a muffle furnace at 700 ° C After sintering for 7h, the Gd 2 o 3 The cured body of the matrix; cathode preparation: the sintered Gd 2 o 3 The solidified body is punched, and fixed and bound with a wire to obtain the cathode; electrolysis: the prepared cathode is inserted into a molten state LiCl (50g)-KCl (50g)-Li 2 In a crucible of O (1wt%) molten salt, graphite was used as an anode at 650° C. for 20 h by constant cell voltage method (2.80 V).

[0030] Characterization: The electrolysis product was washed with water and dried, and the dried product was analyzed by XRD. like image 3 As shown, it is found that metal Gd is obviously generated...

Embodiment 3

[0032]A method for reducing rare earth oxides to metal simple substances in a chloride molten salt system, comprising the following steps: Grinding: taking 2g Dy 2 o 3 Add 5wt% polyethylene glycol for grinding; drying: drying the ground material; tableting: pressing the dried material into a green body; sintering: putting the green body into a muffle furnace at 800 ° C After sintering for 6h, the Dy 2 o 3 The cured body of the matrix; cathode preparation: the sintered Dy 2 o 3 The solidified body is punched and fixed and bound with a wire to obtain the cathode; electrolysis: insert the prepared cathode into a molten state LiCl(42g)-KCl(58g)-Li 2 In a crucible of O (2wt%) molten salt, graphite was used as an anode at 600° C. for 24 hours by constant cell voltage method (3.40 V).

[0033] Characterization: The electrolysis product was washed with water and dried, and the dried product was analyzed by XRD. like Figure 4 As shown, it is found that in the XRD pattern, metal...

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Abstract

The invention provides a method for reducing rare earth oxide into rare earth metal elementary substance in a chloride molten salt system. The method comprises the following steps that a, grinding isconducted, wherein a pore-forming agent is added into the rare earth oxide for grinding and mixing; b, tabletting is conducted, wherein tabletting is conducted on the materials mixed in the step a toprepare a green body; C, sintering is conducted, the green body is put into a muffle furnace for sintering to prepare a rare earth oxide solidified body; d, a cathode is prepared, wherein the rare earth oxide solidified body is bundled by using a metal wire to obtain the required cathode; e, electrolysis is conducted, the cathode is inserted into a crucible filled with chloride molten salt in a molten state, electrolyzing is conducted by taking graphite as an anode, and rare earth oxide is reduced into the rare earth metal elementary substance; and the chloride molten salt in the step e is chloride molten salt LiCl-KCl added with Li2O. The method is simple to operate, a rare earth metal solid can be obtained through direct electrolysis, and a new method is provided for rare earth smeltingand spent fuel aftertreatment.

Description

technical field [0001] The invention belongs to the fields of rare earth smelting and spent fuel reprocessing, and more specifically relates to a method for reducing rare earth oxides to rare earth metal simple substances in a chloride molten salt system. Background technique [0002] In 2000, George Zheng Chen, Derek J.Fray and Tom W.Farthing scholars were in CaCl 2 Successfully achieved the direct incorporation of TiO in molten salt 2 Electrolytic reduction to metal Ti, this electrolytic method is called FFC Cambridge method (FFC-Cambridge). This process method directly electrolytically reduces metal oxides into metal elements in molten salt. At present, the electrolyte used by the research object of the FFC Cambridge method, CaCl 2 The molten salt system is the most common, and CaCl is also selected 2 -CaO, CaCl 2 -NaCl etc. as research. However, this type of molten salt has the problems of high melting point and high service temperature. Excessive use temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/34
CPCC25C3/34
Inventor 季男黄卫龚昱蒋锋彭浩佘长锋朱铁建
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI