Saponification of organic extractant

An organic extractant and saponification technology, applied in the field of saponification of organic phase, can solve the problems of ammonium consumption, high recovery cost, difficult recovery, etc., and achieve the effects of eliminating pollution, reducing production cost and saving three waste treatment costs.

Active Publication Date: 2006-08-16
CHINALCO GUANGXI NONFERROUS RARE EARTH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extractants used in the above extraction and separation are all organic extractants, which require extraction and separation at low acidity. The extraction capacity (distribution ratio) is inversely proportional to the equilibrium acidity of the water phase. Generally, to extract a rare earth ion, three hydrogen ions need to be replaced into the water phase. Therefore, inorganic bases such as ammonia, sodium hydroxide, and ammonium bicarbonate must be used to saponify the extractant first, remove hydrogen ions (see reac

Method used

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  • Saponification of organic extractant
  • Saponification of organic extractant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1.4mol / l P204 (kerosene dilution) flows into the first stage mixing chamber of saponification tank with the speed of 5 liters / min; , the acidity is PH4 rare earth solution (5 liters / min) pulping, also with the speed of 5 liters / min the first-stage mixing chamber of the saponification tank is continuously introduced to mix with the organic extractant; level clarification.

[0036]The organic extractant after saponification contains rare earth La-NdREO 27.0g / l, and the saponification rate is 34.6%. It directly flows into the first stage of the cerium grouping extraction section.

Embodiment 2

[0038] 1.5mol / l P507 (sulfonated kerosene dilution) flows into the first-stage mixing chamber of the saponification tank at a speed of 10 liters / min; the rare earth carbonate (REO 43%, 450 g / min) containing La-Gd is used to contain REO 13.5g / l, the rare earth solution (10 liters / min) with an acidity of PH3 is slurried, and is also continuously introduced into the first-stage mixing chamber of the saponification tank at a speed of 10 liters / min to mix with the organic extractant; adopt 3-stage mixing and clarification tank co-flow Extraction saponification, 2-stage clarification.

[0039] The organic extractant after saponification contains rare earth La-GdREO 29.3g / l, the saponification rate is 34.7%, and directly flows into the first stage of the Gd-Tb grouping extraction section.

Embodiment 3

[0041] The rare earth carbonate (REO 42% 343 g / min) obtained by ammonium bicarbonate precipitation in the ion-adsorption type rare earth ore water immersion solution is mixed with 0.3N hydrochloric acid solution (5 liters / min), and then continuously introduced into the mixing chamber of the saponification tank; 1.5mol / l P507 (kerosene dilution) blank organic phase also flows into the mixing chamber of the saponification tank at a speed of 5 liters / min to mix and react with the rare earth carbonate slurry; adopt 4-stage mixing and settling tank for co-flow extraction saponification, and 2-stage clarification.

[0042] The saponified organic extractant contains REO 28.7g / l, saponification rate is 34.0%, and directly flows into the first stage of the gadolinium-terbium grouping extraction section.

[0043] The acidity of the saponification residual liquid is 0.3N, and the concentration of REO is 0.11g / l, and it is directly returned to be used for rare earth carbonate pulping.

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Abstract

A process for saponifying the organic extractant used for separating RE includes such steps as mixing the extractant with RE carbonate in RE solution or acidic solution, ion exchange reaction between RE ions and H ions of extractant, binding H ions with radical of carbonic acid to generate CO2 and H2O for gradually dissolving RE, extracting RE ions into organic phase, and reusing the residual liquid after supplementing RE solution or acid solution. Its advantages are no environmental pollution and low cost.

Description

technical field [0001] The invention relates to a saponification method of an organic phase. Specifically, rare earth carbonate is used to saponify the organic extractant, and the organic extractant for rare earth separation is reacted with rare earth carbonate in a rare earth solution or acidic solution, so that the rare earth ion is exchanged with the hydrogen ion in the extractant, and the hydrogen ion is replaced by water. The phase combines with carbonate ions to generate carbon dioxide and water, so that the rare earth ions are gradually dissolved and extracted into the organic phase, and an extractant containing a certain concentration of rare earth is obtained for rare earth extraction and separation. Background technique [0002] At present, the separation and purification of a single rare earth element in industry generally adopts solvent extraction. The most commonly used processes are: saponification of P507, P204, C272 and other extractants to extract and separa...

Claims

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Application Information

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IPC IPC(8): B01D11/04C22B3/26C22B3/38C22B59/00
CPCY02P10/20
Inventor 李红卫黄小卫龙志奇彭新林刘营赵娜李萃
Owner CHINALCO GUANGXI NONFERROUS RARE EARTH DEV CO LTD
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