Method for recovering tungsten and rhenium from scrap tungsten-rhenium thermocouple wire

• Main Authors: WU YUFENG, PAN DE'AN, TAN ZHE, CHEN XI
• Format: Patent
• Language: Chinese; English
• Published: 19.01.2018
• 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 discloses a method for recovering tungsten and rhenium from a scrap tungsten-rhenium thermocouple wire, and belongs to the field of solid waste resource utilization. The scrap tungsten-rhenium thermocouple wire is taken from a scrap tungsten-rhenium thermocouple at first and put into a strong oxidant for overall leaching after the surface of the scrap tungsten-rhenium thermocouple wire is cleaned; then the scrap tungsten-rhenium thermocouple wire reaches the complete leaching state under the conditions of the certain leaching temperature, concentration and solid-to-liquid ratio;a leaching system is dried and roasted, and powder obtained after roasting is filtered through pure water; and tungsten oxide powder is obtained after oversize materials are dried, and ammonium rhenate powder is obtained after undersize materials are subjected to recrystallization treatment and filtering. Thus, tungsten and rhenium in a tungsten-rhenium alloy wire are separated and recycled through the environment-friendl