An ion-type rare earth ore smelting method based on synergistic precipitation and resource recycling

Abstract

This invention relates to the field of hydrometallurgical technology, specifically disclosing a method for smelting ionic rare earth ores based on synergistic precipitation and resource recycling, comprising the following steps: S1: Water, ionic rare earth ore, and ferric hydroxide are added to a reaction vessel, and hydrochloric acid is added. During the reaction, after detecting that the residual acidity is greater than 0.3 mol / L, barium chloride is added quantitatively according to the sulfate content; S2: A pH adjuster is added to the reaction system and the temperature is controlled for adjustment. The pH is first adjusted to 2.5-3 and then to 4.5 to form a stepwise precipitation. After the reaction, clarification and separation are performed to obtain supernatant A and concentrate A; S3: The obtained concentrate A is reacted with liquid alkali in an alkali-to-alkali conversion reaction. After the alkali conversion, the alkali slurry is fed into... After washing and filtration, alkali cake residue is obtained; S4: The obtained alkali cake residue is mixed with supernatant A and the pH is adjusted to 5.2. The temperature is controlled at 80℃. After the reaction is clarified, the adjusted residue and supernatant B are obtained; S5: The adjusted residue obtained in S4 is added to acid for leaching. The residual acidity is controlled to be greater than 0.5 mol / L. After the reaction is clarified, supernatant C and concentrate C are obtained; S6: The pH of supernatant C obtained in S5 is adjusted in stages. First, the pH is adjusted to 2.0, and then the pH is stabilized at 3.5. After the reaction, supernatant D and concentrate D are obtained; S7: The pH of supernatant D obtained in S6 is adjusted again and stabilized at 5.2. After the reaction, supernatant E and concentrate E are obtained.

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