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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As a consequence, a ratio of 10 was adopted in these experiments. Plastic film was covered on the top of both leaching column and liquid collecting tank to reduce evaporation. These results indicate that bioleachig multicolumns bioleaching technology is suitable for leaching this type of ore.
Published online Mar 9.
Bioleaching of low-grade uranium ore using Acidithiobacillus ferrooxidans
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 some consumptive acid minerals in tiny fracture which are not reacted by acid in the former stage.
As near-surface oxide orebodies are depleted, mines are having to process deeper sulfide ores that are lower in metal grade and metallurgically more complex.
After bioleaching period, redox potentials of PLS are significantly higher than the correspondence leaching solutions. The compositions of the nutrient growth medium are from PLS at this deposit.
The major uranium mineral is pitchblende which can be easily leached by acid with O 2. Bioleaching is one of the most active technologies [ 1 ]. In this paper, one of the biggest granite uranium deposits located in south Uraniumm with high fluoride mineral is selected for study. These facilities now contain significant uranium resources, and several projects for the treatment of these surface resources are in various stages of development.
Furthermore, this continued multicolumns biloeaching system can reuse the acid of PLS and reduce the acid consumption. The company bioleahcing owns this deposit needs a new technology to solve this problem. A review of the bacterial leaching in the treatment of uranium ores. Thus, the recovery of 4th is greater than that of 3rd column, and that of 3rd is greater than 2nd column and so on.
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 the next 20 days, acid consumption increases still fast but it is lower than that in the first 10 days. In this paper, a continued bioleachjng bioleaching system has been established for leaching a certain uranium ore which contains high fluoride.
A Text Book of Inorganic Analysis. 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.
Sukla1 and G.
As shown in Figure 3the pH values of PLS in the first 5 leaching days decrease very fast but are still greater than 4. 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 U concentration of PLS from 4th column is higher than those of others.
Subscribe to Table of Contents Alerts. 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. Sample volumes of liquid were extracted periodically and the pH and redox potential Eh were measured.
However, the uranium concentration of pregnant leaching solution PLS is low. It improved the iron exchange system to recover uranium. 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.
Uranium Bioleaching – MINTEK | MINTEK
This is good for the iron exchange system to recover the uranium. Materials A solid sample of uranium ore from the normal production of ore in this deposit plant was used. Biolezching this period, the redox potential and the concentration of uranium have no correlation relationship which are presented in Figure 6 a.
That is, bacteria activity was enhanced after they underwent the former column. Uraninite reacts with ferric sulfate to produce soluble uranyl sulfate and ferrous sulfate:.
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 uranium was retained in tailings storage facilities.
Journal of Nanomaterials
or Afer d of leaching, the last column was unloaded out of this system and a new column was added in. Articles from Indian Journal of Microbiology are provided here courtesy of Springer. Figure 6 a shows the uranium concentration of PLS with different column in bioleaching stage. The continued multicolumns bioleaching is seen to be very effective for leaching uranium. In most cases, uranium on the Witwatersrand occurs as uraninite, which requires an oxidative leach for its extraction.
In the s, Mintek undertook extensive research into the bioleaching of typical Witwatersrand uranium- and gold-bearing ores and concentrates.