Impurity removing process for ion-absorbed rare earth ore leaching mother liquor

Abstract

The invention discloses an impurity removing process for an ion-absorbed rare earth ore leaching mother liquor. The impurity removing process comprises the following steps: performing solid-liquid separation on the leaching mother liquor containing impurities through a fine sieve; discharging the leaching liquid into an impurity removing tank and adjusting a pH value; adding a chemical impurity removing agent; stirring using a compressed air; adding methylcyclopentenolone, or maltol, or ethyl maltol, asparagine or glutamine; adding yellow mud and propylene glycol alginate as a settling assistant; fully stirring using the compressed air; stopping the air stirring, and leaving the impurity removing tank to stand for about 8 hours; discharging the clarified and purified upper mother liquor into a rare earth precipitation separation tank through a supernate discharging pipe having a soft connection; after depositions and impurity removing slags accumulated on the bottom layer of the impurity removing tank range from 0.5 m to 1.0 m, discharging the depositions and impurity removing slags into an impurity removing slag tank through a bottom slag discharging pipe; after further airing orpress-filtering dehydration of the impurity removing slags in the impurity removing slag tank, storing the aired and dehydrated impurity removing slags; and returning the supernate to the impurity removing tank. According to the impurity removing process for the ion-absorbed rare earth ore leaching mother liquor, the adopted reagent is safe and environmentally friendly, the environmental hazards are small, the impurity removing rate is high, rare earth ion loss is small, and the subsequent rare earth product quality is high.

Description

Technical field [0001] The invention relates to a process for removing impurities from leaching liquid in hydrometallurgical technology, in particular to a process for removing impurities from ionic rare earth ore leaching mother liquor. Background technique [0002] Ionic rare earth ore leaching mother liquor is not only rich in ionic rare earth ions, but also contains solid impurities such as calcium, magnesium, iron, aluminum and other ionic metals and mud and sand leaves. Among them, calcium and magnesium ion impurities are in the rare earth precipitation and separation process conditions Under the conditions of the rare earth precipitation and separation process, iron and aluminum impurities will form precipitates and enter the rare earth products. Solid impurities such as mud, sand and leaves will not be removed before the rare earth precipitation and separation, and the product quality will be affected. . Therefore, the ionic rare earth ore leaching mother liquor needs to...

AI Technical Summary

Problems solved by technology

Use oxalate precipitation to separate rare earths from impurities, which can be separated from most non-rare earth metal elements and acid radical ions, but oxalic acid is toxic and will cause adverse effects on the environment and human body

Carbonic acid precipitation is easier to precipitate, non-toxic, and low in cost, but ammonium bicarbonate will produce insoluble salts with some impurities, which will affect the quality of rare earth products

[0004] Chinese patent (CN94102455.5) an ionic rare earth ore extraction process, acetic acid, ammonium acetate, urotropine, polyammonium propionate, polymethyl methacrylate, and carboxymethyl cellulose sodium are used as impurity removers to remove impurities. However, most of the reagents used are toxic and will cause adverse effects on the human body and the environment

Chinese patent (CN201510404031.8) a rapid impurity removal method for weathering crust elution-type rare earth ore rare earth leachate, ammonium bicarbonate and inorganic sulfide removal, polyacrylamide, polyaluminum chloride or polyaluminium-iron silicate flocculation, The effect of only using ammonium bicarbonate and inorganic sulfide to remove impurities is not very good, which will affect the quality of rare earths