Method for reclaiming sodium molybdate solution from molybdenum-containing leached residue

• Main Authors: HE YUCHAO, LIAO LIBO, LAN SHILIN, ZHANG ZHENGSHU
• Format: Patent
• Language: Chinese; English
• Published: 24.12.2008
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC CHEMISTRY; 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 belongs to a method for reclaiming sodium molybdate liquid from leaching dregs generated in the molybdenum smelting process. The method comprises the following steps: molybdenum containing leaching dregs is mixed with pyrolusite powder, water and phosphoric acid and the mixed pulp is adjusted; under the condition of controlling the acidity-basicity of the pulp, the pulp is subjected to a boiling reaction and then the solid-liquid separation and the washing to obtain the sodium molybdate liquid. In the invention, the pyrolusite powder is used as an oxidant and the phosphoric acid is used as a decomposition agent of insoluble molybdenate, and the reaction is performed at the boiling temperature and in the normal pressure, the method has the characteristics of simple reclaiming method, high efficiency, no exhaust gas emission and low cost, and can reclaim more than 90 percent of the molybdenum in the leaching dregs in the mode of the sodium molybdate liquid; moreover, the method overcomes the defec