Recovery of high-purity rhenium resources from W-Mo-Re alloy scraps by two-stage low-temperature oxidation volatilization

Rhenium in the waste of tungsten-molybdenum-rhenium alloy has high value, but there are problems such as low purity and low recovery rate in recovering rhenium from the waste of tungsten-molybdenum-rhenium alloy. To effectively solve these problems, this article uses a combination of high-temperature pyrometallurgy and secondary low-temperature oxidation volatilization to effectively extract fine-grained rhenium oxide from tungsten-molybdenum-rhenium alloy scrap. The composition and microstructure of the recovered material were analyzed by SEM, XRD, and ICP. The results showed that when the temperatures of the three-zone tube furnace were set to 800°C, 380°C, and 150°C, the content of rhenium oxide in the recovered material from the concentrated precipitate reached 97 %, the content of molybdenum oxide was about 2.3 %, and no tungsten oxide was detected. The material in the concentrated deposition area is oxidized and volatilized at a low temperature of 450°C, resulting in a high purity of 99.95 % and a recovery rate of 82.7 % for Re 2 O 7 . It can be seen that the high-temperature pyrometallurgical method combined with the secondary low-temperature oxidation volatilization method is simple and the recovered rhenium oxide has high purity and excellent performance.