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首页> 外文期刊>Separation and Purification Technology >Synthesis and characterization of neodymium phosphate powder resulted from neodymium loaded-HDEHP organic solutions by a stripping-precipitation process using a Lewis type cell
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Synthesis and characterization of neodymium phosphate powder resulted from neodymium loaded-HDEHP organic solutions by a stripping-precipitation process using a Lewis type cell

机译：负载钕的HDEHP有机溶液通过刘易斯（Lewis）型电池的汽提沉淀法合成磷酸钕粉末并进行表征

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摘要

The solvent extraction process of neodymium(III) from aqueous solution by di(2-ethylhexyl) phosphoric acid (HDEHP) in kerosene has been performed as a first step to accomplish the homogeneous precipitation of neodymium phosphate by stripping from an organic metal loaded HDEHP solution using phosphoric acid solutions. In this study, stripping-precipitation approach was proposed to synthesize powders of neodymium phosphate using a modified Lewis cell. The effects of extractant, organic phase, neodymium concentration, stripping phase, phosphoric acid content and temperature were separately investigated. The neodymium precipitate was characterized by X-ray diffractometry, scanning electron microscopy, particle size measurement, thermogravimetric analysis and infrared spectroscopy. The results showed that the powder precipitated with 3 M H3PO4 showed more regular and slightly larger particles than those obtained by 5 M H3PO4 while the precipitate with 8 M H3PO4 gave highly agglomerated particles. Increasing the HDEHP concentration from 0.25 M to 0.75 M gave an increase of the particle size of the precipitate. As the temperature increases (10-45 °C), the formed particles appeared to be more crystalline and smaller in size.
机译：作为第一步，通过从负载有机金属的HDEHP溶液中汽提，实现了磷酸钕的均匀沉淀，第一步是通过煤油中的二（2-乙基己基）磷酸（HDEHP）从水溶液中萃取钕（III）的步骤使用磷酸溶液。在这项研究中，提出了一种汽提沉淀法，使用改良的Lewis细胞合成磷酸钕的粉末。分别研究了萃取剂，有机相，钕浓度，汽提相，磷酸含量和温度的影响。钕沉淀物通过X射线衍射法，扫描电子显微镜，粒度测量，热重分析和红外光谱进行表征。结果表明，用3 M H3PO4沉淀的粉末显示出比用5 M H3PO4沉淀的粉末更规则和稍大的颗粒，而用8 M H3PO4沉淀的粉末则得到了高度聚集的颗粒。 HDEHP浓度从0.25 M增加到0.75 M会增加沉淀物的粒径。随着温度的升高（10-45°C），形成的颗粒似乎更具结晶性，尺寸更小。

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