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首页> 外文期刊>Materials transactions >Dissolution Behavior of La_2O_3, Pr_2O_3, Nd_2O_3, CaO and A1_2O_3 in Sulfuric Acid Solutions and Study of Cerium Recovery from Rare Earth Polishing Powder Waste via TwotoStage Sulfuric Acid Leaching
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Dissolution Behavior of La_2O_3, Pr_2O_3, Nd_2O_3, CaO and A1_2O_3 in Sulfuric Acid Solutions and Study of Cerium Recovery from Rare Earth Polishing Powder Waste via TwotoStage Sulfuric Acid Leaching

机译：La_2O_3，Pr_2O_3，Nd_2O_3，CaO和A1_2O_3在硫酸溶液中的溶解行为以及通过两次硫酸浸出从稀土抛光粉废料中回收铈的研究

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This study describes a hydrometallurgical processtoinvestigate the cerium recovery from rare earth polishing powder waste (REPPW) containing main elements such as cerium, lanthanum, praseodymium, neodymium, calcium and aluminum. First, dissolution experiments on La_2O_3, Pr_2O_3, Nd_2O_3, CaO and A1_2O_3 with 5 urn particle size in sulfuric acid solutions were carried out using a batch reactor with various acid concentrations (lto15mol/dm3) at different temperatures (30to180°C). The effects of these two parameters on the dissolution reaction were studied. The obtained results showed that two sequential leaching steps were neededtoseparate cerium from the mixture of CeO2, La_2O_3, Pr2O3, Nd_2O_3, CaO and A1_2O_3. The total process for cerium recovery from REPPW via twotostage acid leaching was then developed through the collection of experimental results. Moreover, the dissolution rate of A1_2O_3 was expressed by a shrinking core kinetics model. The variation of the dissolution rate constant with temperature obeyed the Arrhenius equation with activation energy of 130kJtomoH and reaction rate constant as a function of the acid concentration of C0to41. On the basis of the above data, a ktoT (reaction rate constanttoreaction temperature) diagram for a CeO_2toAl_2O_3toH_2SO_4toH_2O system that permits rational extraction of CeO_2 and A1_2O_3 was devised.
机译：这项研究描述了一种湿法冶金工艺，用于研究从稀土抛光粉废料（REPPW）中回收铈的方法，该废料中的主要元素包括铈，镧、,、钕，钙和铝。首先，使用具有不同酸浓度（lto15mol / dm3）的间歇式反应器，在不同温度（30至180°C）下，在硫酸溶液中对La_2O_3，Pr_2O_3，Nd_2O_3，CaO和Al_2O_3在硫酸溶液中的溶解实验。研究了这两个参数对溶解反应的影响。所得结果表明，需要从CeO2，La_2O_3，Pr2O3，Nd_2O_3，CaO和Al_2O_3的混合物中分离铈的两个步骤。然后通过收集实验结果，开发了通过两步酸浸从REPPW中回收铈的总过程。此外，A1_2O_3的溶出速率由收缩的核心动力学模型表示。溶出速率常数随温度的变化服从Arrhenius方程，其活化能为130kJtomoH，反应速率常数为C0to41酸浓度的函数。基于以上数据，设计了允许合理提取CeO_2和Al_2O_3的CeO_2toAl_2O_3toH_2SO_4toH_2O体系的ktoT（反应速率常数至反应温度）图。

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