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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Therefore, high Eh value is good benefit for oxidizing fourth valence uranium [ 15 ].
Redox potentials of from 1st column to 4th column are presented in Figures 5 a5 b5 cand 5 d. When the pH value of irrigating solution reaches over 2. Materials and Methods 2. In the next 20 days, acid consumption increases still fast but it is lower than that in the first 10 days. Uranium mineralizations are product in low level structure of tectonic fault, which mainly contain pitchblende, coffinite, fluorite silicate uranium, lead, and zinc.
Bioleaching of low-grade sphalerite using a column reactor. A technology that has not been considered thus far is the tank bioleaching of uranium concentrates. It can have certain influence on the growth of microorganisms.
This system can increase the uranium concentration of PLS. In China, hard-rock-type uranium such as granite-type deposits are using bioleacuing leaching widely in industry.
It is found that the acid consumption of the later columns will be lower than that of the former ones. All of these characteristics were observed during the isolation of the strain used. The uranium recovery of the 4th column is over 8.
A solid sample of uranium biolfaching from the normal production of ore in this deposit plant was used. The sulfur weight is 0.
In the next five days, pH values decrease slowly compared with the former 5 days and reach around 2. However, these are expensive reagents, and bioleachung create environmental problems by releasing harmful impurities into the leaching circuit.
Abstract Bioleaching has lots of advantages compared with traditional heap leaching. The bacterial strain that was used in the leaching experiments was isolated from the Jaduguda mine water sample. A study of the bioleaching of spanish uranium ore. This 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 is properly cited.
Bioleaching of uranium was carried out with Turamdih ore sample procured from Uranium Corporation of India Limited, Jaduguda. Microbiological leaching of uranium ores. Biotechnology As near-surface oxide orebodies are depleted, mines are urahium to process deeper sulfide ores that are lower in metal grade and metallurgically more complex.
So we try to use continued multicolumns bioleaching in uranium to model multiheaps bioleaching as to improve the production efficiency and reduce the production cost.
Indexed in Science Citation Index Expanded. They enhance the ferrous oxidizing and produce ferric iron to oxidize biioleaching and uraninite as shown in the following equations [ 14 ]: In the acidification period, there occurs a uranium concentration peak. Bioleaching of uranium from low-grade black schists by Acidithiobacillus ferrooxidans.
Furthermore, when the pyrite is dissolved or, more precisely, is oxidized, ferric iron is produced which can offer good oxidizing for those reduced-type uranium minerals. Published online Mar 9. It has been established that this ratio must be greater than 4 and not in excess of 20 in order to avoid any effects of the wall urajium 910 ]. This work was financially supported by National Plans Grant no.
In this paper, one of the biggest granite uranium deposits located in south China with high fluoride mineral is selected for study.
For the bacteria culture and the PLS as irrigation solution changed in turns, the red curves of irrigation solution are more fluctuant than blue curve of PLS. Leaching in columns simulates percolation leaching because bioleacying conditions are very biolezching to those in the heap [ 5 ].
Articles from Indian Journal of Microbiology are provided here courtesy of Springer. Introduction Biological metallurgy technology does not have a long history in leaching minerals.
For comparison, a single column test is conducted at the same time. The continued multicolumns bioleaching is seen to be very effective for leaching uranium. Microbial removal of uranium in uranium bearing black shale.
Uraniumm reacts with ferric sulfate to produce soluble uranyl sulfate and ferrous sulfate:. This reaction requires a source of iron and a high redox potential.
This technology can effectively enhance both bacteria activity and uranium concentration of PLS. During bioleaching period, redox potentials increase and uranium concentrations are also increased as shown in Figures 5 and 6.
Chemical and mineralogical composition of the ore sample used in column bioleaching.
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