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首页> 外文期刊>The Journal of Chemical Thermodynamics >Bio- and mineral acid leaching of rare earth elements from synthetic phosphogypsum Paul
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Bio- and mineral acid leaching of rare earth elements from synthetic phosphogypsum Paul

机译：来自合成磷酸缺口保罗的稀土元素的生物和无机酸浸出

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Leaching of six individual rare earth (yttrium, cerium, neodymium, samarium, europium, and ytterbium) doped synthetic phosphogypsum samples using a suite of lixiviants was conducted. The lixiviants chosen for this study were phosphoric acid, sulfuric acid, gluconic acid, and a "biolixiviant" consisting of spent medium containing organic acids from the growth of the bacterium Gluconobacter oxydans on glucose. The biolixiviant had a pH of 2.1 and the dominant organic acid was determined to be gluconic acid, present at a concentration of 220 mM. The leaching behaviors of the studied lixiviants were compared and rationalized by thermodynamic simulations. The results suggest that at equivalent molar concentrations of 220 mM the biolixiviant was more efficient at rare earth element (REE) extraction than gluconic acid and phosphoric acid but less efficient than sulfuric acid. Unlike the organic acids, at pH 2.1 the mineral acids failed to extract REE, likely due to different complexation and kinetic effects. (C) 2019 Elsevier Ltd.
机译：进行了六种单独稀土（钇，铈，钕，钐，鉴别的钐，鸡肉和镱）使用一套Lixiviants的掺杂合成磷光屑样品。选择本研究的李敏患者是磷酸，硫酸，葡萄糖酸，和“生物敏性”，以及由含有有机酸的废介质组成的葡萄糖葡萄糖的生长。 BiOxiviant的pH为2.1，并且测定显性有机酸是葡萄糖酸，其浓度为220mm。比较了学习的Lixiviants的浸出行为，并通过热力学模拟进行了合理化。结果表明，在220mM的等效摩尔浓度下，Bioxiviant在稀土元素（REE）萃取中比葡萄糖酸和磷酸更有效，但比硫酸更低。与有机酸不同，在pH2.1中，无机酸未能提取REE，可能是由于不同的络合和动力学效应。 （c）2019年elestvier有限公司

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