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研究了拜耳法赤泥脱铝及提取氧化钪的工艺。赤泥配料∶碱比=1.65,钙比=2.4,烧结温度为1080±20℃,烧结时间为40 min。熟料经稀碱液溶出、洗涤后,赤泥中的氧化铝含量降低了78.73%。在60℃,L/S=5条件下用6.5 mol/L盐酸浸出1.5 h,用2%P507+磺化煤油萃取钪,钪萃取率达90.60%,分相快。经2 mol/L NaOH溶液反萃钪,草酸沉积,800℃焙烧1h后,得到纯度为95.20%的氧化钪。
The dealumination of red mud by Bayer process and the process of extracting scandium oxide were studied. Red mud ingredients: alkali ratio = 1.65, calcium ratio = 2.4, the sintering temperature is 1080 ± 20 ℃, the sintering time is 40 min. The clinker is leached by dilute alkali solution, and the content of alumina in the red mud is reduced by 78.73% after washing. Leaching with 6.5 mol / L hydrochloric acid at 60 ℃ and L / S = 5 for 1.5 h, extracting scandium with 2% P507 + sulfonated kerosene, the extraction rate of scandium was 90.60%, and the phase separation was fast. Scandium was stripped with 2 mol / L NaOH solution and deposited with oxalic acid. After roasting at 800 ℃ for 1h, scandium oxide with purity of 95.20% was obtained.