Preextraction method for organic extraction agent, product and uses thereof

An organic extractant and pre-extraction technology, applied in the direction of improving process efficiency, etc., can solve problems such as unacceptable by enterprises, difficulty in recycling, water resource pollution, etc., and achieve reduction in production costs, low content of alkaline earth metals, and reduction of ammonia nitrogen wastewater Effect

Active Publication Date: 2008-12-10
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that, in the extraction process, not only is the cost increased due to the consumption of a large amount of ammonia, but also a large amount of ammonia nitrogen wastewater will be produced, which will cause serious pollution to water resources. Due to the low concentration of ammonia nitrogen wastewater, it is difficult to recycle, and the recovery cost is very high. High, unacceptable for enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add magnesium oxide (MgO content is 92%) central particle diameter D in the pre-extraction tank 503.5 μm, the mixed extractant of praseodymium chloride solution (0.35mol / L) and 1.5mol / L P507 (80%) and P204 (20%) carries out pre-extraction; The flow rate of the praseodymium solution is 38L / min, the flow rate of the organic phase is 67L / min, and the mixed extraction time is 20 minutes. After 5 stages of co-current and 3 stages of countercurrent extraction, the loaded organic phase containing praseodymium is obtained, and the rare earth content REO is 0.18mol / L , the pH value of the raffinate water phase is 2.0, the raffinate water phase is directly extracted with 1.0mol / L P204, the organic / water phase=0.7 / 1, after 6 stages of extraction, the rare earth content REO in the raffinate water phase is 0.0014mol / L L, the rare earth recovery rate was 99.8%. The obtained loaded organic phase is directly used for the extraction and separation of Pr / Nd, and after 93 stages of fract...

Embodiment 2

[0033] Magnesium oxide powder central particle size D 50 MgO content is 1.2μm, MgO content is 88%, magnesium oxide is added at a flow rate of 0.9kg / min, praseodymium chloride solution (0.85mol / L) is added at a flow rate of 16L / min, and 1.5mol / LP507 organic phase is added at a flow rate of 70L / min In the pre-extraction tank, the mixed extraction time is 15 minutes, and the temperature in the tank is 48°C. After 4 stages of co-current and 3 stages of counter-current extraction, a loaded organic phase containing praseodymium is obtained. The rare earth content REO is 0.187mol / L, and the raffinate water The phase pH value is 2.5, and the raffinate water phase is directly extracted with 1.0mol / L P204, organic / water phase = 0.5 / 1, after 6 stages of extraction, the rare earth content REO of the raffinate water phase is 0.002mol / L, and the recovery rate of rare earth 99.8%. The obtained loaded organic phase is directly used for the extraction and separation of Pr / Nd, and after 90 sta...

Embodiment 3

[0035] In the pre-extraction tank, add magnesium oxide (MgO content is 88%, central particle diameter D 50 1.5 μm,) water slurry (magnesia solid content is 3wt%), praseodymium chloride solution (1.18mol / L) and 1.5mol / LP507 carry out pre-extraction; Magnesia addition rate is 0.44kg / min, praseodymium chloride solution The flow rate is 5.2L / min, the flow rate of the organic phase is 32L / min, and the mixed extraction time is 15 minutes. After 4 stages of co-current extraction, 2 stages of countercurrent extraction, and 2 stages of clarification, a loaded organic phase containing praseodymium is obtained. The rare earth content REO is 0.191mol / L, the pH value of the raffinate aqueous phase is 3.0, the rare earth content REO in the raffinate aqueous phase is 0.0026mol / L, and the recovery rate of rare earth is 99.6%. The obtained loaded organic phase is directly used for the extraction and separation of Pr / Nd, and after 86 stages of fractional distillation, extraction and separation,...

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Abstract

The invention discloses a pre-extraction method for an organic extraction agent, a product and an application thereof in the extraction and separation of rare earths. The pre-extraction method comprises the following steps that: the organic extraction agent is directly mixed with a rare earth solution and alkaline-earth metal compound powder or water slurry containing magnesium and/or calcium forpre-extraction, rare earth metal ions in an aqueous phase are extracted into an organic phase, exchanged nascent hydrogen ions dissolve an alkaline-earth metal compound to maintain the acidity balance of an extraction system so as to produce a loaded organic extraction agent which contains the rare earth metal ions and is used for nonsaponifiable extraction and separation of rare earth elements. In the extraction method, the organic extraction agent does not need liquid ammonia and liquid alkali to saponify, no ammonia nitrogen waste water is produced during the extraction and separation process of the rare earths, the separation cost for the rare earths is greatly reduced, and a large amount of cost for three-waste treatment is saved. The method is suitable for the extraction and separation of the rare earths in all hydrochloric acid systems, sulphuric acid systems and nitric acid systems, has small investment, and takes effect quickly.

Description

technical field [0001] The invention relates to a pre-extraction method and product of an organic extractant and its application in rare earth extraction and separation. Specifically, the organic extractant is directly mixed with the rare earth solution and the alkaline earth metal compound powder or water slurry containing magnesium and / or calcium for pre-extraction, the rare earth metal ions in the water phase are extracted into the organic phase, and the new Ecological hydrogen ions dissolve alkaline earth metal compounds to obtain a loaded organic extractant containing rare earth metal ions for non-saponification extraction and separation of rare earth elements. 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 separate rare earth elements in hydrochloric acid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/26C22B3/38C22B3/32C22B3/40C22B59/00
CPCY02P10/20
Inventor 黄小卫李红卫龙志奇彭新林张永奇崔大立李建宁
Owner GRIREM ADVANCED MATERIALS CO LTD
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