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首页> 外文学位 >Metallurgical Processing and the Effect of Ethylenediaminetetra-Acetic Acid in Extraction and Separation of Rare-Earth Elements by Solvent Extraction with Di-2Ethylhexyl Phosphoric Acid.
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Metallurgical Processing and the Effect of Ethylenediaminetetra-Acetic Acid in Extraction and Separation of Rare-Earth Elements by Solvent Extraction with Di-2Ethylhexyl Phosphoric Acid.

机译：乙二胺四乙酸的冶金加工及乙二胺四乙酸在稀土元素萃取分离中的作用

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摘要

A study was conducted to determine the amenability to extraction of the rare earth elements (REE) and the effect of ethylene diamine tetra-acetic acid (EDTA), a chelating agent, on their separation in di-2ethylhexyl phosphoric acid (DEHPA) solvent extraction systems. To physically concentrate the ore, a screening process was used, and was successful in concentrating the rare earth elements hosted within the minerals in the fine size fractions, with higher grades in the minus 500 mesh (-25 microns) portion. The pre-concentrate was upgraded from a head grade of 13.8% to 19.1% REE using the simple screening process. Recoveries averaging 96% total rare earths were obtained in the leach tests with 20% hydrochloric acid at 90°C. Experiments of solvent extraction with DEHPA in kerosene were performed using the leachate produced in the leaching experiments. Different concentrations of EDTA were added to the aqueous phase prior to mixing with the organic. Addition of EDTA improves the percentage extraction and separation factors for some heavy rare-earth elements. Data from percent extraction and separation factors show noticeable sensitivity to concentrations of EDTA. It was observed that erbium (Er) and ytterbium (Yt) display the highest percent extractions of 84% and 92%, respectively.
机译：进行了一项研究以确定稀土元素（REE）的提取能力以及螯合剂乙二胺四乙酸（EDTA）对在二-2-乙基己基磷酸（DEHPA）溶剂提取中分离它们的影响系统。为了对矿石进行物理浓缩，使用了筛选过程，并成功地将矿物中的稀土元素以细粒级分浓缩，其中较高品位的矿石粒度为负500目（-25微米）。使用简单的筛选过程，将预浓缩物的稀土元素从13.8％REE提高到19.1％REE。在90°C的20％盐酸浸出试验中，平均回收了96％的稀土。使用浸出实验中产生的浸出液进行了DEHPA在煤油中的溶剂萃取实验。在与有机物混合之前，将不同浓度的EDTA加入到水相中。 EDTA的添加改善了一些重稀土元素的提取和分离因子的百分比。提取和分离因子百分比的数据显示出对EDTA浓度的显着敏感性。据观察，（Er）和（Yt）的最高提取率分别为84％和92％。

著录项

  • 作者

    Lo, Sileymane A.;

  • 作者单位

    University of Nevada, Reno.;

  • 授予单位 University of Nevada, Reno.;
  • 学科 Engineering Mining.
  • 学位 M.S.
  • 年度 2012
  • 页码 53 p.
  • 总页数 53
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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