Method for removing metal ion purity of rare earth aqueous solution extraction

Abstract

The invention relates to a method for removing metal ion purity of rare earth solution aqueous solution aqueous solution extraction, and belongs to the metallurgy filed of rare earth extraction. The method comprises the following steps: hydroxylamine hydrochloride or ascorbic acid taken as a deoxidizer and a hydrosoluble chemical complexing agent are added to an aqueous solution containing various kinds of rare earth ions and purity metal ions of aluminum, iron and / or silicon; the pH value of the aqueous solution is regulated; a hydrosoluble high polymer and an inorganic electrolyte salt are sequentially added into the aqueous solution, and are vibrated and mixed at the room temperature, so that a polymer dual-phase aqueous system is obtained; an organic solution not dissolving in water is added, and a liquid-liquid-liquid three-layer liquid phase coexistence system is obtained. Purity metal ions of aluminum, iron and silicon can gather in a three-phase system polymer while rare earth ion selectively gather in the organic upper phase and / or brine lower phase of a three-phase system. The method can extract and separate rare earth ions, and extract and remove purity metal ions of the aluminum, silicon, iron and the like, and is simple in process flow and high in separation efficiency.

Description

technical field

[0001] The invention belongs to the technical field of solvent extraction metallurgy of rare earth ions, and in particular relates to a method for extracting and removing impurity metal ions with a rare earth aqueous solution. Background technique

[0002] Ion-adsorbed rare earth ores are rich in medium and heavy rare earth elements, widely distributed in southern provinces of my country (such as Jiangxi, Guangdong, Fujian, etc.), easy to mine, and low in radioactive elements. To extract rare earth elements from ion-adsorbed rare earth ores, ammonium sulfate heap leaching or in-situ leaching techniques are generally used. In addition to a variety of rare earth elements contained in the leachate, aluminum, iron, and silicon are the main non-rare earth impurity metal ions. The existence of these impurity ions often causes serious emulsification in the subsequent rare earth element extraction and separation process, resulting in a decrease in separation efficie...

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