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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Efficiency of bioleaching was studied by varying bioleching like pulp density and initial ferrous concentration as source of energy. Subscribe to Table of Contents Alerts. Therefore, the pH of irrigating solution cannot be lower than 1. As shown in Bioleachung 3the pH values of PLS in the first 5 leaching days decrease very fast but are still greater than 4. World J Mic Biotech. However, the fluoride content 1. It has a relationship with the granite of Yanshan period in space and genesis.

These results indicate that continued multicolumns bioleaching technology is suitable for leaching this type of ore.

Bioleaching of low-grade sphalerite using a column reactor. Materials and Methods 2. The ratio of the internal diameter of the column to the height of ore is important for the leaching solution percolates more efficiently.

Bioleaching of uranium from low-grade black schists by Acidithiobacillus ferrooxidans. In this type of ore, many minerals such as pyrite and urinate belong to reduced substances.

In China, hard-rock-type uranium such oof granite-type deposits are using heap leaching widely in biolesching. 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. The company who owns this deposit needs a new technology to solve this problem. Microbiological leaching of uranium ores.

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This can be toxic for bacteria growth in bioleaching progress. This system can increase the uranium concentration of PLS. Obviously, the average uranium concentration of PLS of later column biooeaching higher than that of the former one.

Bioleaching of low-grade uranium ore using Acidithiobacillus ferrooxidans

The peaks for the control column and the 1st column are much lower than the later columns. Acidithiobacillus ferrooxidans is Gram-negative bacteria [ 8 ], characterized by nonsporulating rods, 0. Uraninite reacts with ferric sulfate to produce soluble uranyl sulfate and ferrous sulfate: Iron oxidizing bacteria are a good worker who can do this job.

Furthermore, this continued multicolumns bioleaching system can effectively utilize the remaining acid of PLS, which can reduce the sulfuric acid consumption. The other reason is that the bacteria can adapt more easily to the leaching environment which contains high fluorine and other toxic ions after adopting extreme toxic iron environment in former column. Uraninite reacts with ferric sulfate to produce soluble uranyl sulfate and ferrous sulfate:. National Center for Biotechnology InformationU.

Vogel AI In: Received Jul 3; Accepted Dec Those tiny fractures around uranium minerals will be enlarged as well.

In China, bioleaching has been greatly improved in uranium industry. This indicates that the bacteria grow well in these columns.

Modern technologies that are simple, cost effective and environmentally sound are required for their extraction. Because the PLS contains bacteria and ferric iron bioleachinv the former column as irrigation solution, in this stage, uranium can be leached more efficiently which has more ferric iron or bacteria. There is a big peak for uranium concentration for each column in the fifth day.

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It can have certain influence on the growth of microorganisms. In the s, Mintek undertook extensive research into the bioleaching of typical Witwatersrand uranium- and gold-bearing ores and concentrates. Pradhan2 T. Back-scattered electron image by EPMA before leaching. For comparison, a single column test is conducted at the same time. The sulfur weight is 0. Please review our privacy policy.

During this experiment, both redox potentials of irrigating solution and PLS are measured in each day. Under these circumstances, the precipitation of both goethite and jarosite-type basic compounds will not occur in the next bioleaching stage and the bacterium will grow in the column as bacteria are adapted to this pH and the culture from the irrigating solution PLS of pH adjustment.

In our continued multicolumns bioleaching experiment, the uranium recovery This uranium ore belongs to a low grade type. In the acidification period, there occurs a uranium concentration peak. By this technology, the leaching time can be shortened and the recovery of minerals can be improved and the production costs can be reduced. 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.

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