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Method for recovering rare earth from rare earth fluoride fused salt electrolysis waste with effects of environmental protection and low cost

A rare earth fluoride, molten salt electrolysis technology, applied in the fields of rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high energy consumption required for equipment, very large environmental impact, difficult waste gas collection and treatment, etc., to achieve production The effect of low cost, low requirement for reaction equipment and high rare earth yield

Inactive Publication Date: 2015-08-19
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, waste molten salt was either discarded as industrial waste, or mixed with qualified molten salt at the expense of product quality for continued use. In order to ensure product quality and resource recycling, rare earth molten salt electrolysis is currently Waste residue recovery is mainly divided into sulfuric acid roasting or alkali-transfer roasting; alkali-transfer roasting is carried out under negative pressure or high temperature, which requires high equipment requirements, high energy consumption, and low rare earth yield; sulfuric acid roasting process has a high fluorine conversion replacement rate, but its The separation process of rare earth chloride is the longest. At the same time, a large amount of hydrogen fluoride gas and sulfuric acid are heated and decomposed and acidic gas emerges during the production process. It is difficult to collect and treat the waste gas, which has a great impact on the environment.

Method used

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  • Method for recovering rare earth from rare earth fluoride fused salt electrolysis waste with effects of environmental protection and low cost
  • Method for recovering rare earth from rare earth fluoride fused salt electrolysis waste with effects of environmental protection and low cost

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 1000Kg gadolinium electrolytic waste as an example, the sample content and distribution are as follows:

[0025] Gd 2 o 3 %

F%

Y 2 o 3 %

Nd 2 o 3 %

Fe 2 o 3 %

al 2 o 3 %

CaO%

TiO 2 %

MoO 3 %

NaCl%

TREO%

54.42

30.91

0.02

0.12

12.47

0.14

0.45

0.11

0.21

1.14

54.57

[0026] Step A. Crushing and milling: the raw materials are coarsely broken by a crusher, and the waste molten salt after primary crushing is about 10-20 mesh; then it is ground by a ball mill to more than 200 mesh.

[0027] Step B. stirring and mixing: the raw materials of step A and 620Kg sodium hydroxide are batched and fully mixed.

[0028] Step C. Roasting conversion: put the material in step B into a roasting iron bowl, and enter the tunnel kiln for roasting at 350°C for 4 hours.

[0029] Step D. Ball milling: Put the material in step C into a ball mill and grind it to 200 me...

Embodiment 2

[0039] Taking 1000Kg electrolytic waste as an example, the sample content and distribution are as follows:

[0040] Gd2O 3 %

F%

Y 2 o 3 %

PR 4 o 11 %

Nd 2 o 3 %

Fe 2 o 3 %

al 2 o 3 %

CaO%

TiO 2 %

MoO 3 %

Li 2 O%

Cl%

TREO%

7.78

31.24

0.01

11.7

29.87

2.99

0.46

0.89

0.08

0.36

12.31

2.31

49.36

[0041] Step A. Crushing and milling: the raw materials are coarsely broken by a crusher, and the waste molten salt after primary crushing is about 10-20 mesh; then it is ground by a ball mill to more than 200 mesh.

[0042] Step B. stirring and mixing: the raw material 500Kg of step A is mixed with 220Kg sodium hydroxide and 74.1Kg sodium carbonate batching, fully mixed.

[0043] Step C. Roasting conversion: put the material in step B into a roasting iron bowl, enter the tunnel kiln at 400°C and roast for 6 hours.

[0044] Step D. Ball milling:...

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Abstract

The invention discloses a method for recovering rare earth from rare earth fluoride fused salt electrolysis waste with effects of environmental protection and low cost. Rare earth fluoride fused salt electrolysis waste is taken as a raw material, and is subjected to breaking, grinding, agitation, mixing, calcining alkali conversion, ball milling, washing, optimal solution leaching, extraction separation, depositing, washing and burning to prepare a single or mixed rare earth oxide. The method has the advantages of high recovery rate of rare earth, low requirement on reaction equipment, repeated use of production sewage, low production cost, energy saving, environmental protection, good working environment, good economic benefit and the like.

Description

technical field [0001] The invention relates to a regeneration technology of rare earth resources, in particular to an environment-friendly and low-cost method for recovering rare earths from rare earth fluoride molten salt electrolysis waste, belonging to the technical field of rare earth resources recovery and reuse. Background technique [0002] Rare earth metals are widely used in electronics, petrochemical, metallurgy, machinery, energy, light industry, environmental protection, agriculture and other fields, and their output and sales are increasing rapidly, especially with the industrialization of rare earth hydrogen storage alloys and NdFeB permanent magnet materials In recent years, the demand for rare earth metals has grown rapidly. At present, single rare earth metals such as La, Ce, Pr, and Nd, and alloys such as Pr-Nd, Gd-Fe, and Dy-Fe are all produced by the fluoride system molten salt electrolysis process. During production, many non-rare earth impurities accu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 胡德远李来超张榕贵
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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