Method for removing aluminum from rare earth solution by benzoate precipitation method

• Main Author: GE XINFANG
• Format: Patent
• Language: Chinese; English
• Published: 13.03.2013
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a method for removing aluminum from a rare earth solution by a benzoate precipitation method. The method comprises the following steps: (1) preparing the raw materials: an aluminum-containing rare earth solution of which the PH is not less than 4 and a REO (rare earth oxide) is 30-300g/L, and a precipitating agent which is one or more of potassium benzoate, sodium benzoate, ammonium benzoate or benzoic acid; and (2) precipitating to remove the aluminum: adding a fixed quantity of the precipitating agent into the aluminum-containing rare earth solution to produce an aluminum benzoate precipitate, and filtering and separating to get rare earth filtrate and aluminum benzoate slag, wherein the using quantity of the precipitating agent is 100-150% of the theoretical reaction amount, and the ratio of Al2O3 in the rare earth filtrate to the REO in percentage by weight is 10-50PPM. The method has the advantages of very low production cost, simple production process, strong process operability