Oxidation-reduction method was widely used in recycling cemented carbide scraps because of relatively low production cost,high recovery rate and easily controlled form of grain size.In this work,WC and Co in waste YG8 hard alloy were converted to WO3 and CoWO4 during the oxidation process.Subsequently,oxide powders were direct carried out with reduction and carburization after ball milling,and anhydrous alcohol was used as reductant as well as carbon source.Based on thermodynamic calculation,the possible reactions in the carburization process were proposed.The influences of reactive temperature and reactive time during the formation of WC-Co powders were investigated.And the effects of temperature on the particle morphology and size also were analyzed.The results show that the waste YG8 hard alloy was completely oxidized for one hour at 800 ℃.Pure WC-Co composite powder was obtained at 800 ℃ for 10 h and the average particle was 190 nm.The Co3W3C phase diffraction intensity of peaks reduced with increasing holding time.The crystal grain coarsening rate increased evidently with relatively high activation energy when carburization temperature higher than 850 ℃.