A process for recovering rare earth from ionic rare earth ore leaching mother liquor by centrifugal extraction

Abstract

The invention discloses a process for recovering rare earth from ionic rare earth ore leaching mother liquor by centrifugal extraction, which comprises the following steps: (1) mixing an ionic liquid extractant with a diluent to obtain an organic phase; In the process, the organic phase is mixed with the leaching mother liquor of ionic rare earth ore, and centrifugal extraction is carried out so that the non-rare earth impurities remain in the water phase, and the rare earth enters the organic phase; (3) the organic phase obtained in step (2) is treated with detergent Washing is carried out to further remove the non-rare earth impurities in the organic phase, and the rare earth remains in the organic phase; (4) using a stripping agent to strip the organic phase obtained in step (3). The invention adopts a centrifugal extractor to replace the traditional mixing and clarifying extraction tank, occupies less production space, and the processing capacity per unit time is significantly improved compared with the traditional method, and the separation coefficient of rare earth and non-rare earth impurities in the extraction system is large, the extraction process does not emulsify, and the production can Continuously.

Description

technical field [0001] The invention belongs to the technical field of rare earth extraction and separation, and in particular relates to a process for recovering rare earth from ion-type rare earth ore leaching mother liquor by centrifugal extraction. Background technique [0002] The ionic rare earth mines in southern my country mainly use the ammonium sulfate-in-situ leaching process to obtain a leaching mother liquor containing rare earths, and then use precipitation and extraction methods to enrich and recover rare earths from the leaching mother liquor. Among them, the oxalate precipitation method is an effective method to recover rare earths and remove non-rare earth impurities, but oxalic acid is a toxic chemical, which poses a threat to the health of operators and the natural environment. [0003] Chinese patent 86100671 discloses a method for recovering rare earths by ammonium bicarbonate precipitation method. The production cost of this method is low, but the rare...

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Problems solved by technology

Among them, the oxalate precipitation method is an effective method to recover rare earths and remove non-rare earth impurities, but oxalic acid is a toxic chemical that poses a threat to the health of operators and the natural environment

[0003] Chinese patent 86100671 discloses a method for recovering rare earths by ammonium bicarbonate precipitation method. The production cost of this method is low, but the rare earth product enriched by this method has a high impurity content, which seriously affects the product quality

Due to the relatively large pKa value of naphthenic acid, it is easy to combine with impurities such as iron (III), aluminum (III), zirconium (IV), titanium (IV) and thorium (IV) in the leached mother liquor to form solids and form an organic phase. emulsification, affecting production

So far, there has been no report of a rare earth recovery process, which can make the extraction process non-emulsified, and can also overcome the shortcomings of the traditional box-type mixing and clarifying extraction tank, which takes up a lot of space and has a large amount of stagnant liquid.

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