A novel approach for recovery of rare earths and niobium from Bayan Obo tailings
A novel approach for recovery of rare earths and niobium from Bayan Obo tailings
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从白云鄂博尾矿中回收稀土和铌的新方法
DOI：
10.1016/j.mineng.2014.04.011
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发表时间：
2014-10
影响因子：
4.8
通讯作者：
Jiang, Maofa
中科院分区：
文献类型：
--
作者：
Zhang, Bo;Liu, Chengjun;Li, Chunlong;Jiang, Maofa
现有的冶金工艺很难经济地从白云鄂博尾矿中回收稀土（RE）和铌（Nb）。在这项研究中，采用了一种新型湿法冶金工艺从白云鄂博尾矿中分离和回收稀土和铌。首先，通过250℃硫酸化焙烧和随后60℃浸出，多金属矿物中的稀土和铌可以有效地提取到浸出液中。其次，用铁粉还原Ti4+和Fe3+离子（生成Ti3+和Fe2+离子）并在pH 2.01下水解，可以有效地从浸出液中沉淀出Nb。然后可以通过在 pH 4.50 下用 NH3⋅H2O–H2C2O4 系统处理来去除沉淀产物中存在的杂质。第三，RE可以在pH 7.15下从上述水解反应混合物的滤液中有效地沉淀出来。最后，可以通过草酸盐共沉淀法去除粗稀土中存在的杂质。该新工艺中稀土和铌的收率分别达到90%和78%。铌（60.67 wt% Nb2O5）和稀土产品（>88.65 wt% RExOy）均具有较高的应用价值。
It is difficult to economically recover rare earths (RE) and niobium (Nb) from Bayan Obo tailings by the existing metallurgical processes. In this study, a novel hydrometallurgy process was employed for separating and recovering RE and Nb from Bayan Obo tailings. Firstly, by sulfating roasting at 250 °C and subsequent leaching at 60 °C, the RE and Nb present in the polymetallic minerals can be efficiently extracted into the leach solution. Secondly, after the reduction of Ti4+and Fe3+ions (to Ti3+and Fe2+ions) with iron powders followed by hydrolysis at pH 2.01, the Nb can be efficiently precipitated from the leach solution. The impurities present in the precipitated product can then be removed by treating with NH3⋅H2O–H2C2O4system at pH 4.50. Thirdly, the RE can be efficiently precipitated at pH 7.15 from the filtrate of above hydrolysis reaction mixture. Finally, the impurities present in the crude RE can be removed by oxalate co-precipitation method. The yield of RE and Nb in this novel process reaches up to 90% and 78%, respectively. Both the Nb (60.67 wt% Nb2O5) and RE products (>88.65 wt% RExOy) have high application value.
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DOI：
--
发表时间：
1963
期刊：
--
影响因子：
--
作者：
F. T. Sisco;E. Epremian
通讯作者：
F. T. Sisco;E. Epremian
DOI：
10.1002/srin.198801530
发表时间：
1988-09
期刊：
Steel Research
影响因子：
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作者：
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通讯作者：
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DOI：
10.2355/tetsutohagane1955.74.5_794
发表时间：
1988-05
影响因子：
0.3
作者：
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通讯作者：
K. Sakuraya;Sadao Furuyama;Shiro Yoshimatsu
DOI：
10.1016/j.mseb.2007.04.003
发表时间：
2007-05
影响因子：
3.6
作者：
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通讯作者：
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DOI：
10.1016/0022-1902(66)80178-1
发表时间：
1966-01-01
期刊：
JOURNAL OF INORGANIC & NUCLEAR CHEMISTRY
影响因子：
--
作者：
DJORDJEVIC, C;GORICAN, H
通讯作者：
GORICAN, H