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| New Comprehensive Utilization Process for Complex Rare-Metal Ore |
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Received:December 27, 2011
Revised:December 28, 2011
Accepted:December 29, 2011
Published Online:June 26, 2012
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| DOI：10.3969/j.issn.1007-7545.2012.07.010 |
| KeyWord:rare-metal ore; comprehensive utilization; rare earth oxide; ferrocolumbium; titanium slag |
| Author | Institution |
| LIU Mu-dan |
广州有色金属研究院 |
| LIU Yong |
广州有色金属研究院 |
| LIU Zhen-zhen |
广州有色金属研究院 |
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| Abstract: |
| A new process of rare earth, niobium and titanium recovered from complex rare-metal ore was studied. The ore was acidized at 400 ℃ with the mass ratio of concentrated sulfuric acid and raw ore of 6∶5. The solution, obtained from the acidification slag leaching process, was hydrolyzed at 100 ℃ for 60 min with the addition of water according to the volume ratio of 1∶1, and the hydrolysis precipitation was obtained. The leached residue was treated by strong magnetic separation to obtain the magnetic and nonmagnetic materials. The mixture of the hydrolysis precipitation and magnetic materials were reduction smelted at 1 800 ℃ to obtain the ferrocolumbium with 22.38% Nb2O5 and 52.32% TFe and the titanium slag with 35.12% TiO2, and the recovery of niobium and titanium was 66.89% and 50.38%, respectively. The rare earth oxide products with REO content of 92.4% could be obtained with the total recovery of rare earth of 71.32% when the hydrolysis solution was adjusted to pH value of 3 with the addition of ammonia water in oxidizing atmosphere and solid-liquid separation, oxalic acid was added according to 1.2 times of the rare earth theory dosage to the filtrate, and the oxalic acid rare earth was roasted at 950 ℃ for 60 min. |
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