从埃及中东部沙漠红海沿岸的赭石-Umm Greifat 中选择性沥滤和分离铀

IF 1.5 4区 工程技术 Q3 METALLURGY & METALLURGICAL ENGINEERING
El-Sayed A. Manaa, Soliman Abu Elatta Mahmoud, Elham Awny
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引用次数: 0

摘要

赭石-乌姆-格雷法特地区是红海地区铁和锌含量较高的地区之一,这些矿藏是由于更新世时期红海区的构造活动而形成的热液。这些矿床还伴有低到高等级的铀矿床。除了锌、铅和铜异常,特别是在影响研究区域的断层带及其分支中,虽然在奥切尔-格里法特地区有大量的锌矿物,但铀矿物却很少,仅有一种矿物--孔雀石(compreignacite)被记录在案,大部分铀以吸附元素的形式存在于铁和/或粘土石上。此外,铀钍石极为罕见,仅以细粒形式存在于岩石中。从断层带富含铁的粘土区提取的技术样本发现,铀含量为 700ppm。根据所用样本的化学和矿物成分,使用碱性溶液对所用样本中铀的可浸出性进行了研究。选定的矿石在 H2O2 作为氧化剂的情况下,用 Na2CO3 和 NaHCO3 进行处理。对许多消化因素进行了研究和优化。在最佳浸出条件下,铀的溶解效率约为 84%。为了分离铀,先将浸出液的 pH 值调节为 10,然后使用 4% 的 Aliquat®336/ 煤油在异癸醇作为第三相防止剂的存在下进行溶剂萃取。然后用 NaOH/H2O2 溶液作为汽提溶液处理负载有机溶剂。最后,使用氨溶液对所得溶液进行沉淀处理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Selective Leaching and Separation of Uranium from Ochre-Umm Greifat, Red Sea Coast, Central Eastern Desert, Egypt

Selective Leaching and Separation of Uranium from Ochre-Umm Greifat, Red Sea Coast, Central Eastern Desert, Egypt

The Ochre-Umm Greifat area is one of the Red Sea areas with high concentrations of iron and zinc, which is formed from hydrothermal solutions as a result of the structural activity that occurred in the Red Sea Zone during the Pleistocene period. These deposits are also accompanied by deposits of low- to high uranium grade. In addition to Zn, Pb, and Cu anomalies, particularly in fault zones and their branches affecting the study area, although there are numerous zinc minerals in the Ocher-Greifat area, uranium minerals are scarce, with only one mineral, compreignacite, being recorded and the majority of the uranium being present as an adsorbed element on iron and/or clay stones. In addition, uranothorite is extremely rare and occurs as fine grains embedded in rocks. A technological sample was taken from an iron-rich clay area in a fault zone and was found to assay 700-ppm uranium. The leachability of uranium from the used sample was investigated using an alkaline solution based on the chemical and mineralogical composition of the used sample. The selected ore is treated with Na2CO3 and NaHCO3 in the presence of H2O2 as oxidant. Many digestion factors are studied and optimized. Under the optimum leaching conditions, the uranium dissolution efficiency is around 84%. For the uranium separation, the pH of the leach liquor is adjusted at 10, then subjected to a solvent extraction step using 4% Aliquat®336/kerosene in the presence of isodecanol as third-phase prevention. The loaded organic solvent was then treated with NaOH/H2O2 solution as a stripping solution. Finally, the resultant solution is subjected to a precipitation step using ammonia solution.

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来源期刊
Mining, Metallurgy & Exploration
Mining, Metallurgy & Exploration Materials Science-Materials Chemistry
CiteScore
3.50
自引率
10.50%
发文量
177
期刊介绍: The aim of this international peer-reviewed journal of the Society for Mining, Metallurgy & Exploration (SME) is to provide a broad-based forum for the exchange of real-world and theoretical knowledge from academia, government and industry that is pertinent to mining, mineral/metallurgical processing, exploration and other fields served by the Society. The journal publishes high-quality original research publications, in-depth special review articles, reviews of state-of-the-art and innovative technologies and industry methodologies, communications of work of topical and emerging interest, and other works that enhance understanding on both the fundamental and practical levels.
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