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| Citation: |
ZHAI Jingyu, LIU Guangyi. The Leaching Technology of Rare Earth Polishing Powder Waste in Thiourea-Hydrochloric Acid System and Recovery of Rare Earth Oxides from the Lixivium Through Oxalic Acid Precipitation[J]. Conservation and Utilization of Mineral Resources, 2022, 42(1): 158-164. DOI: 10.13779/j.cnki.issn1001-0076.2022.01.023
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The solubility of Ce(Ⅲ) is far greater than that of Ce(Ⅳ). Thus, the thiourea was used to reduce Ce(Ⅳ) into Ce(Ⅲ) in dilute hydrochloric acid solutions to promote the recovery of rare earth oxides from a rare earth polishing powder waste. The effects of leaching temperature, leaching time, liquid-to-solid ratio (L/S), hydrochloric acid concentration and thiourea dosage on the leaching ratio of cerium from the rare earth polishing powder waste were investigated. The results showed that under the optimal technologies, hydrochloric acid concentration of 4 mol/L, L/S of 4.2, leaching temperature of 90 ℃, leaching time of 60 min, and thiourea dosage of 0.04 g/g, the cerium leaching ratio reached 99.37%. Then, the rare earth ions in leaching solutions were separated and recovered by oxalic acid precipitation approach. After adjusting pH to 1.8-2.0 by ammonia water, oxalic acid was added to deliver rare earth oxalate precipitates which were subsequently roasted under air to obtain the rare earth oxide (REO) product. The total REO content in the REO product was about 97% with 78.00% CeO2 and 18.93% La2O3, and their recovery ratio was 91.66% and 68.44%, respectively. In addition, the findings of laser particle size analysis, XRD and SEM showed that the rare earth oxide products were mainly composed by CeO2 square particles, and exhibited a narrow particle size distribution with a flat and angular surface.
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