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- Title
剩余污泥破解提取液沉淀低浓度离子型稀土研究.
- Authors
王俊峰; 李海; 钟常明; 唐林旺; 邱廷省; 刘亚奇; 阮翔; 刘志文
- Abstract
It is easy to produce a large number of low-concentration rare earth solutions during the mining process of ion-absorbed rare earth ore, which needs urgently to be effectively recycled. The “ozone + ultrasonic” combined process was applied to treat the city's excess sludge, and the extract was obtained from the supernatant of cracked excess sludge. The effect of reaction time on the change of floe structure of the excess sludge was investigated by light microscope and scanning electron microscope. The composition and precipitation effect of the extract were analyzed by single-channel ICP and X-ray fluorescence. The results indicated that after the excess sludge cracked, SCOD increases from 1052 to 5088 mg.L-1, the content of polysaccharides and proteins increases by 215. 26 and 115. 55 mg.L-1 respectively; a large number of humic acids contained in excess sludge extract by three-dimensional fluorescence detection; when the reaction time is 60 min, the excess sludge morphology changes from lumps to granules, the surface of the sludge is wrinkled, with voids and layered structure, and the particle size decreases, presented fragmentation; compared with ammonium bicarbonate and oxalic acid, the extract has excellent precipitation effect, and the rare earth element precipitation rate is above 89% ; the proportion of rare earth elements such as Nd, Y, La, and Ce in flocculent sediments is relatively high, and the percentage is mainly in the range of 3% to 8%.
- Publication
Journal of the Chinese Society of Rare Earths, 2018, Vol 36, Issue 6, p719
- ISSN
1000-4343
- Publication type
Article
- DOI
10.11785/S1000-4343.20180610