Method for recycling vanadium and chromium from low-concentration pentavalent vanadium and hexavalent chromium mixed liquor

• Main Authors: SHEN BIAO, HE WENYI, GAO GUANJIN, PENG YICUN, FU ZIBI, YIN DANFENG
• Format: Patent
• Language: Chinese; English
• Published: 16.01.2013
• 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 provides a method for recycling vanadium and chromium from low-concentration pentavalent vanadium and hexavalent chromium mixed liquor. The method includes the steps: adjusting the mixed liquor to be strongly acidic and accordingly enabling pentavalent vanadium and hexavalent chromium in the mixed liquor to exist in the forms of VO2+ and Cr2O72-; selectively adsorbing vanadium in the liquor by strongly acidic cation exchange resin to obtain vanadium containing resin and chromium containing liquor; desorbing the vanadium containing resin to obtain vanadium containing desorption liquor; settling vanadium of the vanadium containing desorption liquor to obtain ammonium polyvanadate; treating the ammonium polyvanadate to prepare vanadium pentoxide; and treating the chromium containing liquor to prepare chromium trioxide. The method can be used for directly separating and recycling the vanadium and the chromium from the low-concentration pentavalent vanadium and hexavalent chromium mixed liquor, is be