BIOLEACHING OF URANIUM PDF

Furthermore, control tests were performed to demonstrate the effect of A. ferrooxidans in uranium bioleaching process and showed that the addition of this . PDF | This review describes the involvement of different microorganisms for the recovery of uranium from the ore. Mainly Acidithiobacillus forrooxidans. initial work on uranium bioleaching in the early s was taken to prevent oxidation rate of iron that may affect uranium’s microbial leaching.

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The result demonstrates that the highest leaching of base metals is achieved at low pH values under high redox conditions where ferric iron remains in solutions [ 16 ]. Table of Contents Alerts. The peaks for the control column and the 1st column are much lower than the later columns. In this period, the redox potential and the concentration of uranium have no correlation relationship which are presented in Figure 6 a. This technology has been used in the production [ 23 ] or is still in the laboratory research stage [ 4 ].

Uranium Bioleaching In recent years, there has been an upsurge in uranium exploration across the globe, driven by a renewed interest in nuclear energy and higher uranium prices.

Please review our privacy policy. For introduction of bacterial leaching process at uranium leaching can enhance the kinetics of leaching and strengthen its process, bioleaching has been paid great attention in uranium industry in recent years.

Sample volumes of liquid were extracted periodically and the pH and redox potential Eh were measured. In this type of system, one purpose is the increasing redox potentials of this system; the other purpose is that the iron oxidizing bacteria can grow in the column. In recent years, there has been an upsurge in uranium exploration across the globe, driven by a renewed interest in nuclear energy and higher uranium prices.

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This affects the adsorption efficiency. All of these characteristics were observed during the isolation of the strain used. Journal List Indian J Microbiol v. Bioleaching of low-grade sphalerite using a column reactor. The U concentration of PLS from 4th column is higher than those of others.

Materials and Methods 2. The use of bioleaching as a cost-effective alternative to conventional oxidative leaching processes is being evaluated.

National Center for Biotechnology InformationUrabium. So we try to use continued multicolumns bioleaching in uranium to model multiheaps fo as to improve the production efficiency and reduce the production cost. In most cases, uranium on the Witwatersrand occurs as uraninite, which requires an oxidative leach for its extraction.

Author information Article notes Copyright and License information Disclaimer. Abstract Bioleaching has lots of advantages compared with traditional heap leaching. Biological metallurgy technology does not have a long history in leaching minerals.

Chemical and mineralogical composition of the ore sample used in column bioleaching.

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When pH is lower than 1. Uranium, Bioleaching, Acidithiobacillus ferrooxidans. There exist consumptive acid minerals such as calcite chemical analysis of the weight of CO 2 1.

Therefore, the pH of irrigating solution cannot be lower than 1. This indicates these ores contain lots of fluoride mineral. The cost of production of uranium can be reduced and this benefits the environment too. Introduction Biological metallurgy technology does not have a long history in leaching minerals. The bacteria are also known to be motile by means of a single polar flagellum. With the variation of Eh of irrigating solution, the uranium concentration is varied too.

Received Jul 3; Accepted Dec Recent studies have evaluated process flowsheets that encompass conventional atmospheric leaching using chemical oxidants for these types of orebodies. Violeaching is an open access article distributed under the Creative Commons Attribution Licensewhich permits unrestricted use, distribution, and reproduction in any medium, provided the original work uuranium properly cited. Acidithiobacillus ferrooxidans is Gram-negative bacteria [ 8 ], characterized by nonsporulating rods, 0.

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A solid sample of uranium ore from the normal production of ore in this deposit plant was used. Redox potentials of from 1st column to 4th column are presented in Figures 5 a5 b5 cand 5 d.

A study of the bioleaching of a Spanish uranium ore.

Uraninite reacts with ferric sulfate to produce soluble uranyl sulfate and ferrous sulfate: However, the fluoride content 1. This can be toxic for bacteria growth in bioleaching progress.

Uraninite reacts with ferric sulfate to produce soluble uranyl sulfate and ferrous sulfate:. In this type of ore, many minerals such as pyrite and urinate belong to reduced substances.

Moreover, the acid consumption of the 1st column and that of the 2nd column are very similar. That is, bacteria activity was enhanced after they underwent the former column.

Continued Multicolumns Bioleaching for Low Grade Uranium Ore at a Certain Uranium Deposit

The uranium minerals will be wrapped up by them. The acid of the 3rd and 4th column, however, can accumulate acid from the bioleacuing columns. In China, bioleaching has been greatly improved in uranium industry. Materials A solid sample of uranium ore from the normal production of ore in this deposit plant was used.

Uranium Bioleaching

However, the peak of 4th column is the highest one and that of the 3rd column is the second. This uranium ore belongs to a low grade type. Bioleaching of uranium was carried out with Turamdih ore sample procured from Uranium Corporation of India Limited, Jaduguda. Uranium recovery for each column during the boileaching.

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