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Method for grouping and separating light rare earth ore and high-yttrium ore by two-inlet and three-outlet fractional extraction

A light rare earth and extraction technology, applied in the direction of improving process efficiency, can solve the problems of large acid and alkali consumption, easy aging, and difficult treatment of naphthenic acid organic phase, so as to reduce waste water discharge, reduce acid and alkali consumption, and separate The effect of cost reduction

Inactive Publication Date: 2015-03-04
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the extractant naphthenic acid is easy to age and needs to be renewed in two to three years. The organic phase of the aged naphthenic acid is not easy to handle and is usually discarded in nature, polluting the surrounding environment of the rare earth separation plant
In short, the existing high-yttrium rare earth ore separation process has disadvantages such as large amount of naphthenic acid extraction, waste organic phase of naphthenic acid causing environmental pollution, and large acid-base consumption.

Method used

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  • Method for grouping and separating light rare earth ore and high-yttrium ore by two-inlet and three-outlet fractional extraction

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Experimental program
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Effect test

Embodiment 1

[0020] 1) Rare earth liquid

[0021] The first rare earth feed liquid is bastnaesite rare earth chloride aqueous solution, its rare earth concentration is 1.0 M, and its pH value is 3; in terms of rare earth elements, the molar fraction of light rare earth elements La to Nd is 0.97, and the molar fraction of Sm to Dy is The molar fraction is 0.01, and the molar fractions of Ho to Lu and Y are 0.02.

[0022] The second rare earth feed solution is a rare earth chloride aqueous solution of high yttrium rare earth ore, the rare earth concentration is 1.0 M, and the pH value is 2; in terms of rare earth elements, the molar fraction of light rare earth elements La to Nd is 0.05, and the molar fraction of Sm to Dy is The mole fraction is 0.15, the mole fraction of Ho to Lu is 0.10, and the mole fraction of Y is 0.70.

[0023] In terms of molar ratio of rare earth ions, the ratio of feed amount of yttrium ore rare earth feed liquid to bastnaesite rare earth feed liquid is 1:5.

[00...

Embodiment 2

[0036] 1) Rare earth liquid

[0037]The first rare earth feed liquid is bastnaesite rare earth chloride aqueous solution, the rare earth concentration is 0.5 M, and the pH value is 5; in terms of rare earth elements, the molar fraction of light rare earth elements La to Nd is 0.97, and the molar fraction of Sm to Dy is The molar fraction is 0.01, and the molar fractions of Ho to Lu and Y are 0.02.

[0038] The second rare earth feed solution is a rare earth chloride aqueous solution of high yttrium rare earth ore, the rare earth concentration is 1.5 M, and the pH value is 1; in terms of rare earth elements, the molar fraction of light rare earth elements La to Nd is 0.05, and the molar fraction of Sm to Dy is The mole fraction is 0.15, the mole fraction of Ho to Lu is 0.10, and the mole fraction of Y is 0.70.

[0039] In terms of the molar ratio of rare earth ions, the feed ratio of the yttrium ore rare earth feed liquid to the bastnaesite rare earth feed liquid is 1:1.

[0...

Embodiment 3

[0052] 1) Rare earth liquid

[0053] The first rare earth feed liquid is bastnaesite rare earth chloride aqueous solution, its rare earth concentration is 1.5 M, and its pH value is 1; in terms of rare earth elements, the molar fraction of light rare earth elements La to Nd is 0.97, and the molar fraction of Sm to Dy is The molar fraction is 0.01, and the molar fractions of Ho to Lu and Y are 0.02.

[0054] The second rare earth feed solution is a rare earth chloride aqueous solution of high yttrium rare earth ore, the rare earth concentration is 0.5 M, and the pH value is 5; in terms of rare earth elements, the molar fraction of light rare earth elements La to Nd is 0.05, and the molar fraction of Sm to Dy is The mole fraction is 0.15, the mole fraction of Ho to Lu is 0.10, and the mole fraction of Y is 0.70.

[0055] In terms of the molar ratio of rare earth ions, the feed ratio of the yttrium ore rare earth feed liquid to the bastnaesite rare earth feed liquid is 1:10.

...

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Abstract

The invention discloses a method for grouping and separating light rare earth ore and high-yttrium ore by two-inlet and three-outlet fractional extraction. Two rare earth feed inlets and three rare earth product solution outlets are formed in a fractional extraction system, and a third outlet is formed in an extraction segment. P507 is taken as an extraction agent for simultaneously treating rare earth chloride solutions of two types of rare earth ore, namely the light rare earth ore (bastnasite or monazite rare earth ore) and the high-yttrium ore so as to obtain three products, namely a light rare earth element 'La-Nd' product, a heavy rare earth element 'Ho-Lu+Y' product and a medium-heavy rare earth element 'Sm-Dy' enrichment. Compared with an existing corresponding rare earth fractional extraction process, by grouping and separating the light rare earth ore and the high-yttrium ore by two-feed inlet and three-outlet fractional extraction of -Nd / Sm-Dy / Ho-, the consumption of a saponification alkali is reduced by 17%-86%, the consumption of a washing acid is reduced by 20%-89%, the number of stages of an extraction tank is reduced by 41%-49%, the separation cost of rare earth is significantly reduced, and the green degree of the process is obviously improved.

Description

technical field [0001] The present invention relates to a method for separating light rare earth ore and high yttrium ore by means of two-in and three-out fractional extraction and group separation, in particular to a method in which two rare earth feed liquid inlets and three rare earth product solution outlets are provided in the same fractional distillation extraction system. Use 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (usually abbreviated as P507) as the extraction agent, and use light rare earth ore (bastnaesite or monazite rare earth ore) chloride rare earth solution as the first rare earth feed solution 1. High yttrium ore (Longnan Mine) rare earth chloride solution is the second rare earth feed liquid, ~ Nd / Sm ~ Dy / Ho ~ group separation process of rare earth chloride feed liquid. The invention belongs to the technical field of extraction and separation in hydrometallurgy. Background technique [0002] There are many kinds of rare earth minerals, usually ...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/38
CPCY02P10/20
Inventor 钟学明
Owner NANCHANG HANGKONG UNIVERSITY
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