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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Recent studies have evaluated process flowsheets that encompass conventional uraniu leaching using chemical oxidants for these types of orebodies. As near-surface bioleaxhing orebodies are depleted, mines are having to process deeper sulfide ores that are lower in metal grade and metallurgically more complex. These type of precipitations are difficult to be dissolved by strong acid and that will decrease the permeability of the column [ 12 ].

In the next 20 days, acid consumption increases still fast but it is lower than that in the first 10 days. Bioleaching of low-grade sphalerite using a column reactor. Biileaching the next five days, pH values decrease slowly compared with the former 5 days and reach around 2. The peaks for the control column and the 1st column are much lower than the later columns.

A review of the bacterial leaching in the treatment of uranium ores. A study of the bioleaching of spanish uranium ore.

Journal of Nanomaterials

Materials A solid sample of uranium ore from bioleacing normal production of ore in this deposit plant was used. However, some consumptive acid minerals in bioelaching fractures will be reacted more slowly. There exist consumptive acid minerals such as calcite chemical analysis of the weight of CO 2 1. These results indicate that continued multicolumns bioleaching technology is suitable for leaching this type of ore. Bioleaching has lots of advantages compared gioleaching traditional heap leaching.

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Because the first column is the initial column in this type of system and the acid amount of PLS from the 1st column is small, the irrigating solution of 2nd column needs to add more acid for pH adjustment using PLS from the 1st column.

Moreover, the acid consumption of the 1st column and that of the 2nd column are very similar. This reaction requires a source of iron and a high redox potential.

Uraninite reacts with ferric sulfate to produce soluble uranyl sulfate and ferrous sulfate: These facilities now contain significant uranium resources, and several projects for the treatment of these surface resources are in various stages of development. Microbiological leaching of uranium ores. Journal List Indian J Microbiol v. In this paper, a continued column bioleaching system has been established for leaching a certain uranium ore which contains high fluoride.

Please review our privacy policy. The compositions of the nutrient growth medium are from PLS at this deposit. Those tiny fractures around uranium minerals will be enlarged as well.

Bioleaching of low-grade uranium ore using Acidithiobacillus ferrooxidans

Table 1 shows the chemical and mineralogical composition of the sample. The uranium minerals will be wrapped up by them. Furthermore, this continued multicolumns bioleaching system can reuse the acid of PLS and reduce the acid consumption. Acidithiobacillus ferrooxidans is Gram-negative bacteria [ 8 ], characterized by nonsporulating rods, 0.

Thus, during bioleaching, the pH of irrigating solution in the column will be increased. This type of uranium ore is mainly distributed in Taoshan Zhuguangshan mineralization belt. Sukla1 and G. There is a big peak for uranium concentration for each column in the fifth day. It improved the iron exchange system to recover uranium. Modern technologies that are simple, cost effective and environmentally sound are required for their extraction.

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In most cases, uranium on the Witwatersrand occurs as uraninite, which requires an oxidative leach for its extraction. This indicates that the bacteria grow well in these columns.

A Text Book of Inorganic Analysis. Plastic film was covered on the top of both leaching column and liquid collecting tank to reduce evaporation.

This system can increase the uranium concentration of PLS. Therefore, high Eh value is good urainum for oxidizing fourth valence uranium [ 15 ].

This technology has been used in the production [ 23 ] or is still in the laboratory research stage [ 4 ]. The redox potential of PLS is much lower than that of bacteria culture.

Abstract Bioleaching has lots of advantages bioleaaching with traditional heap leaching. Uranium recovery for each column during the leaching.

In our study, a strain of mesospheric iron oxidizing bacteria Acidithiobacillus ferrooxidans mixed with Leptospirillum ferriphilum, named B3mYP1Q provided by our university was used throughout the investigations. Introduction Biological metallurgy technology does not have a long history in leaching minerals.

Uranium Bioleaching – MINTEK | MINTEK

Relationship between each column of Eh value. The major uranium mineral bioleafhing pitchblende which can be easily leached by acid with O 2. Thus, the recovery of 4th is greater than that of 3rd column, and that of 3rd is greater than 2nd column and so on.