Method for fractionation and extraction separation of mischmetal through three feeding openings

A technology of mixed rare earth and feed port, which is applied in the separation of chlorinated rare earth feed liquid, fractional extraction and separation of mixed rare earth with three feed ports, which can solve the problems of high acid and alkali consumption, increased acid and alkali consumption, and low yield of rare earth , to achieve the effects of reducing wastewater discharge, improving the degree of greening, and reducing separation costs

Inactive Publication Date: 2017-03-15
NANCHANG HANGKONG UNIVERSITY
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  • Description
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  • Application Information

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Problems solved by technology

When the purity of the product separated by grouping is lower than 99.99%, it will not only prolong the length of the subsequent separation process, but also increase the consumption of acid and alkali and reduce the yield of rare earth
[0008] As far as the current extraction and separation of the three rare ear

Method used

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  • Method for fractionation and extraction separation of mischmetal through three feeding openings

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Rare earth liquid

[0030] With the rare earth chloride aqueous solution of lanthanum-rich ore as the first feed liquid, the molar fraction of light and medium rare earth elements is 0.90, and the molar fraction of heavy rare earth is 0.10 in terms of rare earth elements; The second kind of feed liquid, the molar fraction of light and medium rare earth elements is 0.70, and the molar fraction of heavy rare earth is 0.30; The mole fraction is 0.85. The rare earth concentration of the rare earth chloride feed solution is 1.0M, and the pH value is 3.

[0031] 2) Rare earth saponification organic phase

[0032] The rare earth extraction organic phase is a kerosene solution containing P507 and TOP. The volume percentage concentration of P507 is 30%, the volume percentage concentration of TOP is 15%, and the degree of saponification is 36%.

[0033] 3) Washing liquid

[0034] The heavy rare earth chloride was used as the washing solution, the rare earth concentration ...

Embodiment 2

[0046] 1) Rare earth liquid

[0047] With the rare earth chloride aqueous solution of lanthanum-rich ore as the first feed liquid, the molar fraction of light and medium rare earth elements is 0.90, and the molar fraction of heavy rare earth is 0.10 in terms of rare earth elements; The second kind of feed liquid, the molar fraction of light and medium rare earth elements is 0.65, and the molar fraction of heavy rare earth is 0.35; The mole fraction is 0.85. The rare earth concentration of the rare earth chloride feed liquid is 0.5M, and the pH value is 5.

[0048] 2) Rare earth saponification organic phase

[0049] The rare earth extraction organic phase is a sulfonated kerosene solution containing P507 and TOP. The volume percentage concentration of P507 is 40%, the volume percentage concentration of TOP is 20%, and the degree of saponification is 30%.

[0050] 3) Washing liquid

[0051] The heavy rare earth chloride was used as the washing liquid, the rare earth concent...

Embodiment 3

[0063] 1) Rare earth liquid

[0064] With the rare earth chloride aqueous solution of lanthanum-rich ore as the first feed liquid, the molar fraction of light and medium rare earth elements is 0.90, and the molar fraction of heavy rare earth is 0.10 in terms of rare earth elements; The second kind of feed liquid, the molar fraction of light and medium rare earth elements is 0.70, and the molar fraction of heavy rare earth is 0.30; The mole fraction is 0.90. The rare earth concentration of the rare earth chloride feed solution is 1.5M, and the pH value is 1.

[0065] 2) Rare earth saponification organic phase

[0066] The rare earth extraction organic phase is a kerosene solution containing P507 and TOP. The volume percentage concentration of P507 is 25%, the volume percentage concentration of TOP is 10%, and the degree of saponification is 40%.

[0067] 3) Washing liquid

[0068] The heavy rare earth chloride was used as the washing solution, the rare earth concentration ...

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Abstract

The invention discloses a method for fractionation and extraction separation of mischmetal through three feeding openings. According to the method for fractionation and extraction separation of mischmetal through the three feeding openings, P507 is used as a rare extraction agent, primary amine N1923 is used as an acid extraction agent, and TOP is used as an organic phase modifier; the three feeding openings are arranged in a fractionation and extraction system, Gd/Tb grouped separation is conducted to treat three kinds of rare earth chloride feed liquid of lanthanum-neodymium-rich ore, yttrium-intermediate europium-rich ore and high-yttrium ore at the same time, and then a light and middle rare earth product and a heavy rare earth product are obtained; the lanthanum-neodymium-rich ore feed liquid enters the fractionation and extraction system from the first feeding opening; the yttrium-intermediate europium-rich ore feed liquid enters the fractionation and extraction system from the second feeding opening; and the high-yttrium ore feed liquid enters the fractionation and extraction system from the third opening. The light and middle rare earth product with the purity being 5N is obtained from the water phase of an outlet of a first-level extraction tank of the fractionation and extraction system; and the heavy rare earth product with the purity being 5N is obtained from the extraction raffinate water phase of an acid extraction section. Compared with an existing traditional fractionation and extraction technology, the consumption amount of organic-phase saponification alkaline is lowered by 39%-52%, the consumption amount of pickling acid is lowered by 66%-80%, and the total number of levels of extraction tanks is reduced by 30%-60%.

Description

technical field [0001] The invention relates to a method for fractionating, extracting and separating mixed rare earths with three feed ports, in particular to a method using P507 as a rare earth extractant, setting up three rare earth feed liquid inlets in a fractionating extraction system to simultaneously process lanthanum-rich neodymium ore, middle yttrium-rich A method for separating three kinds of rare earth chloride feed liquids of europium ore and yttrium ore. The invention belongs to the technical field of rare earth extraction and separation. Background technique [0002] Rare earth is an important strategic material of modern high technology. The content of medium and heavy rare earth elements in southern ion-adsorption rare earth ores is significantly higher than that of light rare earth ores, which is a valuable resource for separation and extraction of medium and heavy rare earth elements. Ion-adsorption rare earth ores are divided into three categories: the ...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/26
CPCC22B59/00C22B3/26Y02P10/20
Inventor 钟学明肖勇
Owner NANCHANG HANGKONG UNIVERSITY
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