Optimization of the leaching process for uranium recovery and some associated valuable elements from low-grade uranium ore

2021 ◽  
pp. 1-23
Author(s):  
Hend A. Radwan ◽  
Abeer A. Faheim ◽  
Enass M. El-Sheikh ◽  
Zeinab H. Abd El-Wahab ◽  
Mohamed A. Gado
Keyword(s):  
Low Grade ◽  
Uranium Recovery ◽  
Uranium Ore ◽  
Leaching Process

Resin-in-pulp method for uranium recovery from leached pulp of low grade uranium ore

2007 ◽  
Vol 85 (2-4) ◽  
pp. 103-109 ◽  
Author(s):  
Kazem Mirjalili ◽  
Mahshid Roshani
Keyword(s):  
Low Grade ◽  
Uranium Recovery ◽  
Uranium Ore

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

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Gongxin Chen ◽  
Zhanxue Sun ◽  
Yajie Liu
Keyword(s):  
Low Grade ◽  
Exchange System ◽  
Uranium Recovery ◽  
Industrial Facilities ◽  
Uranium Ore ◽  
Bacteria Growth ◽  
Acid Consumption ◽  
High Fluoride ◽  
Cost Of Production ◽  
The Cost

Bioleaching has lots of advantages compared with traditional heap leaching. In industry, bioleaching of uranium is still facing many problems such as site space, high cost of production, and limited industrial facilities. In this paper, a continued column bioleaching system has been established for leaching a certain uranium ore which contains high fluoride. The analysis of chemical composition of ore shows that the grade of uranium is 0.208%, which is lower than that of other deposits. However, the fluoride content (1.8% of weight) is greater than that of other deposits. This can be toxic for bacteria growth in bioleaching progress. In our continued multicolumns bioleaching experiment, the uranium recovery (89.5%) of 4th column is greater than those of other columns in 120 days, as well as the acid consumption (33.6 g/kg). These results indicate that continued multicolumns bioleaching technology is suitable for leaching this type of ore. The uranium concentration of PLS can be effectively improved, where uranium recovery can be enhanced by the iron exchange system. Furthermore, this continued multicolumns bioleaching system can effectively utilize the remaining acid of PLS, which can reduce the sulfuric acid consumption. The cost of production of uranium can be reduced and this benefits the environment too.

Column Bioleaching Experiment of Low Grade Uranium Ore from Xiangshan Uranium Deposit

2013 ◽  
Vol 825 ◽  
pp. 314-317
Author(s):  
Jin Hui Liu ◽  
Ya Jie Liu ◽  
Zhi Hong Zheng ◽  
Xue Gang Wang ◽  
Yi Peng Zhou ◽  
...  
Keyword(s):  
Uranium Concentration ◽  
Rock Type ◽  
Uranium Deposit ◽  
Acid Leaching ◽  
Uranium Content ◽  
Low Grade ◽  
Particle Sizes ◽  
Uranium Recovery ◽  
Uranium Ore ◽  
Acid Consumption

Xiangshan uranium deposit is the largest volcanic rock type uranium ore in China. Great number of low grade uranium ore (U < 0.03%) was stacked in the tailings dam as a waste rock in more than 50 years of exploitation, resulted in uranium resources waste. Two group column bioleaching experiments (column AB) were carried on in order to investigate uranium recovery effect by microbial for the low grade uranium ore. The bacteria for the tests was a mixture mainly composed by Acidithobacullus ferrooxidans and Leptospirrillum ferriphilum, which was isolated from the uranium minerals of Xiangshan uranium deposit and domesticated with the mineral and leachate system. The average uranium content is 0.0123%, the particle sizes for column A and B is less than 25mm The Fe2+, Fe3+ and F- average contents of the test minerals were 1.90%, 0.59% and 0.14% respectively. Results showed that uranium leaching rate calculated by uranium concentration of slag were 76.75%, 75.31% in 95days and 85 days of test column A, B respectively. Rate of acid consumption of column test A, B were 7.60% and 7.69% respectively. while the rate of acid consumption was usually more than 10% by acid leaching. These evidences suggested that microbial hydrometallurgical technology was had effective for the low grade uranium ore and significant on uranium recovery for the low grade uranium ores.

Study of Microorganism Trench-Leaching of a Chinese High Fluorine-Bearing Uranium Ore

2015 ◽  
Vol 1130 ◽  
pp. 468-472
Author(s):  
Xiao Lan Mo ◽  
Jian Kang Wen ◽  
Cheng Yan Xu ◽  
Biao Wu ◽  
Bo Wei Chen ◽  
...  
Keyword(s):  
Particle Size ◽  
Real Time ◽  
Real Time Pcr ◽  
Microbial Population ◽  
Acid Leaching ◽  
Pcr Analysis ◽  
Low Grade ◽  
Fluoride Solution ◽  
Uranium Ore ◽  
Leaching Process

The microorganism trench-leaching process of a low-grade uranium ore with a high content of fluorine was experimentally studied through the technique of Real-time PCR by using the fluorine-tolerance bacteria of Retech-3 as the leaching-ore bacteria. It was found that the Retech-3 strains of fluorine-tolerance domestication grown well in a fluoride solution with concentration of 0.0~3.0 g·L-1, and the oxidation of Fe2+ ions to Fe3+ ions occurred rapidly to promote the extraction of uranium. The experimental results showed that the bioleaching rate (89.82%) of uranium can be improved of 13.80% than acid leaching in 30 days with 65 kg ore and its particle size of-6 mm (fraction of 100%) in trench. The Real-time PCR analysis of microbial population compositions revealed that Retech-3 strains were mainly composed of Leptospirillum sp. and Acidithiobacillus sp. in the leaching process. The obvious improvements of fluorine-tolerance domestication of bacteria and the uranium leaching process will provide fundamentals for the smooth utilization of a high fluorine-containing uranium ore with the aid of microorganism trench-leaching.

The Effect of Different Oxidants on Extraction of Uranium from Low Grade Ore

2020 ◽  
Vol 299 ◽  
pp. 1104-1108
Author(s):  
Ashimkhan T. Kanayev ◽  
Khussain Valiyev ◽  
Aleksandr Bulaev
Keyword(s):  
Sulfuric Acid ◽  
Potassium Permanganate ◽  
Ferric Sulfate ◽  
Low Grade ◽  
Acid Solutions ◽  
Uranium Recovery ◽  
Ammonium Persulphate ◽  
Uranium Extraction ◽  
Increase Rate ◽  
Sulfuric Acid Solutions

The effect of different oxidants on extraction of uranium from low grade ore was studied. Leaching was performed using sulfuric acid solutions at a concentration of 10 to 30%. Ferric sulfate Fe2(SO4)3, ammonium persulphate (NH4)2S2O8, and potassium permanganate KMnO4 at different concentrations were used as oxidants in different variants of the experiment. In addition, solutions collected at Vostok deposit containing 6.86 g/L Fe3+ and 106 cells/mL of the bacteria Acidithiobacillusferrooxidans were used for leaching. The rate of uranium extraction with sulfuric acid solutions without oxidants was low and did not exceed 19.4%. Addition of oxidants made it possible to increase rate of uranium extraction. In the presence of ferric sulfate, ammonium persulphate, and potassium permanganate rates of uranium extraction were up to 68, 95.2, and 69.6%, respectively. The rate of uranium leaching in the experiments with the AMD sample was high and reached about 95%. Therefore, it can be concluded that using not only oxidizing agents, but AMD, which are formed during the natural oxidation of sulfide minerals contained in the ore of the deposit, can significantly increase the rate of uranium recovery.

Recovery of valuable metals from a low-grade nickel ore using an ammonium sulfate roasting-leaching process

2012 ◽  
Vol 19 (5) ◽  
pp. 377-383 ◽  
Author(s):  
Xin-wei Liu ◽  
Ya-li Feng ◽  
Hao-ran Li ◽  
Zhi-chao Yang ◽  
Zhen-lei Cai
Keyword(s):  
Ammonium Sulfate ◽  
Low Grade ◽  
Leaching Process ◽  
Valuable Metals

Microbiological leaching of a low-grade uranium ore byThiobacillus ferrooxidans

1976 ◽  
Vol 3 (2) ◽  
pp. 157-167 ◽  
Author(s):  
R. Guay ◽  
M. Silver ◽  
A. E. Torma
Keyword(s):  
Low Grade ◽  
Uranium Ore

Leaching and Kinetic Modeling of Malaysian Low Grade Manganese Ore in Sulfuric Acids

2016 ◽  
Vol 1133 ◽  
pp. 629-633 ◽  
Author(s):  
Suhaina Ismail ◽  
Hashim Hussin ◽  
Syed Fuad Saiyid Hashim ◽  
Norazharuddin Shah Abdullah
Keyword(s):  
Dissolution Kinetics ◽  
Product Layer ◽  
Low Grade ◽  
Manganese Ore ◽  
Leaching Process ◽  
Mixed Control ◽  
New Variant ◽  
Experimental Parameters ◽  
Kinetics Of ◽  
And Diffusion

The leaching process of Malaysian low grade manganese ore (LGMO) using bamboo sawdust (BSD) as reducing agent in acidic medium (H2SO4) and the dissolution kinetics of this ore was investigated. Acid concentration, reaction temperature, and BSD loading were chosen as experimental parameters through application of response surface methodology (RSM). For analysis of the kinetic data in this study, the SCM with surface chemical reaction and diffusion through product layer, the mixed control modelled and also new variant SCM were evaluated. The reaction kinetics of this leaching process was determined, and it is observed that it fits the model of 1-23X-(1-X)23=kt with activation energy of 69.3kJ/mol. The reaction rate for LGMO leaching using BSD was found to be diffusion through product layer.

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