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

A technology of impurity metal ions and rare earth ions, applied in the direction of improving process efficiency, etc., can solve the problem of uncontrollable three-phase distribution of non-rare earth impurity ions

Active Publication Date: 2013-12-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the rare earth aqueous solution also contains non-rare earth impurity ions such as aluminum, silicon, and iron, ...

Method used

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

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Embodiment 1

[0041]Dissolve the oxides of lanthanum, samarium, and thulium with 7mol / L aqueous hydrochloric acid solution, heat the acid, and prepare a mother solution containing lanthanum, samarium, and thulium ions (concentration is about 5mmol / L). Dissolve aluminum chloride hexahydrate to prepare mother liquor containing aluminum ions (concentration is about 30mmol / L); dissolve ferric chloride to prepare iron-containing mother liquor (concentration is about 15mmol / L); dissolve sodium silicate solid to prepare Silicon-containing mother liquor (concentration is about 25mmol / L). Take 1 mL of each of the above-mentioned mother liquors, add hydroxylamine hydrochloride in a molar ratio of 0.3:1 to the total amount of impurity metal ions aluminum, iron and silicon as a reducing agent, and mix thoroughly at room temperature. 1,10-phenanthroline was dissolved to make a stock solution with a concentration of 35mmol / L, and EDTA solid was dissolved with 1mol / L NaOH solution to make an aqueous solut...

Embodiment 2

[0043] Dissolve the oxides of cerium, samarium and lutetium with 6mol / L nitric acid aqueous solution respectively, heat and chase the acid, and prepare mother liquor containing cerium, samarium and lutetium ions (concentration is about 5mmol / L). Dissolve aluminum chloride hexahydrate to prepare mother liquor containing aluminum ions (concentration is about 30mmol / L); dissolve ferric chloride to prepare iron-containing mother liquor (concentration is about 15mmol / L); dissolve sodium silicate solid to prepare Silicon-containing mother liquor (concentration is about 25mmol / L). Take 1 mL of each of the above mother liquors, add hydroxylamine hydrochloride in a molar ratio of 0.7:1 to the total amount of impurity metal ions aluminum, iron and silicon as a reducing agent, and mix thoroughly at room temperature. 1,10-phenanthroline was dissolved to make a stock solution with a concentration of 35mmol / L, and EDTA solid was dissolved with 1mol / L NaOH solution to make an aqueous solutio...

Embodiment 3

[0045] Dissolve the oxides of lanthanum, cerium, gadolinium, and thulium with 6mol / L perchloric acid aqueous solution respectively, heat the acid, and prepare a solution containing lanthanum, cerium, gadolinium, and thulium ions (concentration is about 5mmol / L). Dissolve aluminum chloride hexahydrate to prepare mother liquor containing aluminum ions (concentration is about 30mmol / L); dissolve ferric chloride to prepare iron-containing mother liquor (concentration is about 15mmol / L); dissolve sodium silicate solid to prepare Silicon-containing mother liquor (concentration is about 25mmol / L). Take 1 mL of each of the above mother liquors, add hydroxylamine hydrochloride in a molar ratio of 0.5:1 to the total amount of impurity metal ions aluminum, iron and silicon as a reducing agent, and mix thoroughly at room temperature. Dissolve 1,10-phenanthroline to make an aqueous solution with a concentration of 35mmol / L, and dissolve EDTA solid with 1mol / L NaOH solution to make an aqueo...

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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...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B59/00
CPCY02P10/20
Inventor 黄焜隋娜刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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