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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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And then in the next bioleaching stage, acid consumption still increase slowly because some acid needs to be added in the bacteria domestication pond for pH adjustment and there are still urabium consumptive acid minerals in tiny fracture which are not reacted bioleachinf acid in the former stage. Vogel AI In: Biotechnology As near-surface oxide orebodies are depleted, mines bioleacching having to process deeper sulfide ores that are lower in metal grade and metallurgically more complex.

For comparison, a single column test is conducted at the same time. Sukla1 and G. The uranium recovery is highly leached Recent studies have evaluated process flowsheets that encompass conventional atmospheric leaching using chemical oxidants for these types of orebodies.

In industry, bioleaching of uranium is still facing many problems such as site space, high cost of production, and limited industrial facilities. Support Center Support Center. Indexed in Science Citation Index Expanded. In this paper, one of the biggest granite uranium deposits located in south China with high fluoride mineral is selected for study.

Back-scattered electron image shows that the uranium minerals are located in the tiny fractures of the ore and they are accompanied by pyrite as shown in Figure 1. Uraninite reacts with ferric sulfate to produce soluble uranyl sulfate and ferrous sulfate: Please review our privacy policy. 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 ].

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In many cases, bioleaching is the most suitable process. Novel flowsheets that maximise the recovery of uranium and minimise the processing volumes are being assessed.

Microbial leaching of uranium and other trace elements from shale mine tailings at Ranstad. These facilities now contain significant uranium resources, and several projects for the treatment of these surface resources are in various stages of development. In practice, the iron is usually obtained from pyrite — which is either associated with or added to the ore, and a high redox potential is achieved by adding oxidising agents such as pyrolusite MnO 2 and sodium chlorate NaClO 3.

Bioleaching of uranium from low-grade black schists by Acidithiobacillus ferrooxidans.

In acidification stage, therefore, the acid concentration should be decreased as well. Iron oxidizing bacteria are a good worker who can do this job. Thus, the recovery of 4th is greater than that of 3rd column, and that of 3rd is oc than 2nd column and so on.

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The company who owns this deposit needs a new technology to solve this problem. Articles from Indian Journal of Microbiology are provided here courtesy of Springer.

Most of sixth valence uranium minerals are leaching because they can dissolve in acid normally.

During bioleaching period, redox potentials increase and uranium concentrations are also increased as shown in Figures 5 and 6. In South Africa, uranium was produced as a by-product of gold production in the Witwatersrand Basin, but after the collapse of the uranium market in the s, the uranium plants were mothballed and the uraniumm was retained in tailings storage facilities. Journal List Indian J Microbiol v.

To receive news and publication updates for Journal of Nanomaterials, enter your email address in the box below. Those tiny fractures around uranium minerals will be enlarged as well. All of these characteristics were observed during the isolation of the strain used.


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.

The compositions of the nutrient growth medium are from PLS at this deposit. Furthermore, this continued multicolumns bioleaching system can effectively utilize the remaining acid of PLS, which can reduce the sulfuric acid consumption.

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

The ratio of the internal diameter of the column to the height of ore is important for the leaching solution percolates more efficiently. An improved medium and harvesting procedure for securing high cell yields.

That is, bacteria activity was enhanced after they underwent the former column. As shown in Figure 3the pH values of PLS in the first 5 leaching days decrease very fast but are still greater than 4. A Text Book of Inorganic Analysis.

Uranium Bioleaching – MINTEK | MINTEK

Redox potentials of from 1st column to 4th column are presented in Figures 5 aif b5 cand 5 d. Microbial removal of uranium biokeaching uranium bearing black shale. Acidithiobacillus ferrooxidans is Gram-negative bacteria [ 8 ], characterized by nonsporulating rods, 0.

Moreover, the acid consumption of the 1st column and that of the 2nd column are very similar. The test process and the specific implementation process are as follows: This is because the later column utilized the PLS of the former column which contains ferric iron as stronger oxidizing agent.

Uranium recovery for each column during the leaching. Materials and Methods 2.