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Rare earth extraction separation method and device

A rare earth extraction separation and extraction technology, applied in the direction of improving process efficiency, can solve the problems of consumption of large alkali and acid, large amount of waste water, and high treatment cost

Pending Publication Date: 2018-09-25
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (3) Need to consume a lot of alkali and acid
[0012] (4) The amount of waste water per unit product is large, and the treatment cost is high

Method used

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  • Rare earth extraction separation method and device
  • Rare earth extraction separation method and device
  • Rare earth extraction separation method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] The rare earth feed liquid enters the extraction and separation tank 3 from the head tank 1-1 through the flow meter 2-1 for extraction and separation;

[0076]Extraction and separation of the obtained praseodymium and neodymium loaded organic phase (the concentration of rare earth elements is 0.1903mol / L) is imported into the first-stage reactor of the stripping-precipitation-saponification tank 4 from the outlet of the 92nd-stage processor of the extraction separation tank 3, At the same time, (NH 4 ) 2 C 2 o 4 The aqueous solution (concentration is 50g / L) enters the 6th stage reactor of the stripping-precipitation-saponification tank 4 from the head tank 1-2 through the flowmeter 2-2 to carry out the stripping-precipitation-saponification treatment on the loaded organic phase 20min, wherein, praseodymium neodymium loaded organic phase and (NH 4 ) 2 C 2 o 4 The flow ratio of the aqueous solution Vs:Va=30:26 (mL / min);

[0077] The saponified organic phase obtai...

Embodiment 2

[0086] The rare earth feed liquid enters the extraction and separation tank 3 from the head tank 1-1 through the flow meter 2-1 for extraction and separation;

[0087] Extraction and separation of the obtained praseodymium and neodymium loaded organic phase (the concentration of rare earth elements is 0.1721mol / L) is imported into the first-stage reactor of the stripping-precipitation-saponification tank 4 from the outlet of the 92nd-stage processor of the extraction separation tank 3, At the same time, Na 2 C 2 o 4 The aqueous solution (concentration is 40g / L) enters the 6th grade reactor of back extraction-precipitation-saponification tank 4 from head tank 1-2 through flow meter 2-2, carries out back extraction-precipitation-saponification treatment to the loaded organic phase 20min, wherein, praseodymium neodymium loading organic phase and Na 2 C 2 o 4 The flow ratio of the aqueous solution Vs:Va=30:29 (mL / min);

[0088] The saponified organic phase obtained after str...

Embodiment 3

[0096] The rare earth feed liquid enters the extraction and separation tank 3 from the head tank 1-1 through the flow meter 2-1 for extraction and separation;

[0097] Extraction and separation of the obtained yttrium-rich loaded organic phase (the concentration of rare earth elements is 0.2051mol / L) is imported into the first-stage reactor of the stripping-precipitation-saponification tank 4 from the outlet of the 156th-stage processor of the extraction separation tank 3, At the same time, Na 2 C 2 o 4 The aqueous solution (concentration is 40g / L) enters the 6th grade reactor of back extraction-precipitation-saponification tank 4 from head tank 1-2 through flow meter 2-2, carries out back extraction-precipitation-saponification treatment to the loaded organic phase 10min, wherein, yttrium-rich organic phase and Na 2 C 2 o 4 The flow ratio of the aqueous solution Vs:Va=30:50 (mL / min);

[0098] The saponified organic phase obtained after stripping-precipitation-saponifica...

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Abstract

The invention provides a rare earth extraction separation method, which comprises the following steps that rare earth material liquid is subjected to extraction separation to obtain a loaded organic phase; rare earth elements are contained in the loaded organic phase; a water solution of oxalate is used for performing reverse extraction-precipitation-saponification treatment on the loaded organicphase; rare earth precipitates and saponified organic phases are obtained; the rare earth precipitates are sequentially subjected to washing and firing; rare earth oxides are obtained; the saponifiedorganic phase is reused in the extraction separation process. Oxalate and the loaded organic phase are used for reaction; oxalate simultaneously plays three important roles of a stripping agent, a precipitating agent and a saponifying agent; the organic phase reverse extraction-rare earth precipitation-organic phase saponification treatment is realized in one step; the consumption of two third chemical materials is reduced, so that the production cost is greatly reduced; the green and energy-saving production and the efficient utilization of each ion of chemical regents are realized.

Description

technical field [0001] The invention relates to the technical field of rare earth metallurgy, in particular to a method and device for rare earth extraction and separation. Background technique [0002] During the rare earth extraction and separation process, the blank organic phase is saponified with a saponification agent such as ammonia water, liquid caustic soda or calcium carbonate, and the obtained saponified organic phase enters the extraction and separation system to obtain the difficult-to-extract component (i.e. the difficult-to-extract rare earth solution) and the easy-to-extract component ( That is, the loaded organic phase), the loaded organic phase needs to back-extract the easy-to-extractable rare earths from the loaded organic phase through hydrochloric acid, sulfuric acid or nitric acid and other stripping agents to obtain easy-to-extractable rare earth solutions, and the two rare earth solutions use oxalic acid, ammonium bicarbonate or sodium carbonate and ...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/02C22B3/26
CPCC22B3/02C22B59/00C22B3/26Y02P10/20
Inventor 陈冬英周洁英杨新华伍莺洪侃李忠岐
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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