Method for recovering hexavalent chromium resources from chromium slag

• Main Author: LIU JIE
• Format: Patent
• Language: Chinese; English
• Published: 21.09.2011
• 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 recovering hexavalent chromium resources from chromium slag. The method comprises the following steps of: subjecting chromium-containing slag to wet-process ball milling to obtain chromium slag powder, and adding water into the chromium slag powder to prepare chromium slag slurry; adding acid into the chromium slag slurry to prepare a chromium slag slurry solution, and simultaneously stirring the chromium slag slurry solution sufficiently to ensure that the chromium slag slurry is leached in the acid; subjecting the leached chromium slag slurry to solid-liquid separation to obtain hexavalent-chromium-containing filtrate, and adding acid into the hexavalent-chromium-containing filtrate; and adding a reducing agent into the hexavalent-chromium-containing filtrate added with the acid, adding base, washing and filtering to finally recover chromium hydroxide. By adopting the method for recovering the hexavalent chromium resources from the chromium slag, 60-80% of the hexavalen