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The Significance of Mobilization and Immobilization of Specific Radionuclides for Optimum Bioleaching Conditions Using Aspergillus lentulus
Physics of Particles and Nuclei Letters Pub Date : 2020-04-08 , DOI: 10.1134/s1547477120020077
Nareman Harpy , Mohamed A. E. Abdel-Rahman , Abdelsattar M. Sallam , Sameh El Dabour

Abstract

Gamma spectrometry is applied for measurement of natural radioactivity by Hyper-pure germanium (HPGe) systems during the application of bioleaching optimum conditions in ore and waste samples. The bioleaching of the ore sample using isolated fungus A. lentulus indicate that the bioleaching efficiency of 234U, 232Th are higher than 238U, 230Th and 235U which may attributed to the effect α-recoil rate for 234U, organic matter, clays or iron oxide and or/lower activity concentration of 232Th. The immobilization of 238U, 235U, 230Th, 214Pb, and 214Bi in ore and waste samples could be result from high organic matter content, iron, and manganese oxides, in addition to the role of microbes that can resist leaching by their cellular compounds. The high mobility of some radionuclides in waste samples may be resulted from the leaching process of the original rocks using acid solution that clean the grain surfaces leaving spaces around the grains and this permit the organic acids to reach the inner parts of the grains during bioleaching processes leading to the high mobility 234U, 232Th and to lesser extent 238U and 235U. The radionuclides 226Ra, 214Pb and 214Bi were found almost totally in the residue of two sample (Q and W) indicating to be associated with radium sulphate or relatively insoluble mineral phases like alumina silicates and refractory oxides.


中文翻译:

动员和固定化特定的放射性核素对于使用小曲霉的最佳生物浸出条件的意义

摘要

在矿石和废物样品中生物浸出最佳条件的应用过程中,伽马能谱法用于通过超纯锗(HPGe)系统测量自然放射性。使用分离的真菌扁豆A.进行生物浸出表明,234 U,232 Th的生物浸出效率高于238 U,230 Th和235 U,这可能归因于234 U,有机物的α反冲率,粘土或氧化铁和/或较低的活性浓度232 Th。的固定化238 U,235 U,230 Th时,214矿石和废物样品中的Pb和214 Bi可能是由于有机物含量高,铁和锰的氧化物高,以及微生物可以抵抗其细胞化合物浸出的作用。废物样品中某些放射性核素的高迁移率可能是由于使用酸溶液对原始岩石进行浸出过程而产生的,酸溶液清洁了谷物表面,在谷物周围留下了空间,这使得有机酸在生物浸出过程中可以到达谷物的内部。导致高迁移率234 U,232 Th,并在较小程度上导致238 U和235U。放射性核素226 Ra,214 Pb和214在两个样品(Q和W)的残留物中几​​乎完全发现了Bi,表明与硫酸镭或相对不溶的矿物相(如硅酸铝和难熔氧化物)有关
更新日期:2020-04-08
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