废弃稀土抛光粉再生利用的研究

Recovery of Rare Earth from Waste Polishing Powder

通过对废弃稀土抛光粉再生利用的研究发现,以浓硫酸为浸出液时,硫酸和废弃抛光粉质量比为1.5,浸出反应温度160℃,浸出时间3 h时,稀土的浸出率达到92.3%。通过扫描电镜发现稀土氧化物随着煅烧温度的升高粒径逐渐变小。在550℃时,稀土氧化物晶体开始形成小颗粒有规则的晶体。对抛光粉的抛光性能研究发现,再生抛光粉比市售的抛光粉性能要好。氧化铈含量为85.37%的再生抛光粉,抛光60 min,抛蚀量可以达到437nm/min,并随着再生抛光粉的氧化铈含量的增加会提高打磨性能。

Through the studies on the recycling of waste rare earth polishing powder, it was found that when using concentrated sulfuric acid as leaching agent, sulfuric acid to waste polishing powder 1.5, the leaching reaction temperature 160℃ and leaching time 3 h ,the leaching rate of rare earth reached 92.3%. Scanning election microscopy revealed particle size of rare earth oxides decreased gradually with increase of calcination temperature. The rare earth oxide crystals began to form small regular crystals at 550 ℃. The regenerated polishing powder had better polishing performance than commercially available ones. Burnishing mass of the regenerated polishing powder with 85.37% ceria reached 437 nm/min（60 min）. With increase of ceria content, the polishing performance would be improved.