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; 文章编号:1672-7207(2014)06-1766-06 Regularities for uranium leaching rate at different heights of column for leaching uranium from uranium ore FU Haiying, DING Dexin, YE... test were compared. The results show that the uranium leaching rate at different heights of the column are different, and there are the same trends for the model value and test data. So......
; Abstract: In the case of in-situ leaching of uranium, the primitive...) were studied. The results show that, when the pH value of the simulated solution is about 8, the reduction rate of SO42- by SRB and the removal rate of uranium, Mn2+, Zn2+, Pb2+ and Fe2+ will reach......
. The results indicate that the creep rate becomes a little faster with the reduction of the uranium dioxide grain size at the same temperature and the same load. At the same temperature, the logarithmic value of the steady creep rate vs stress has linear relation, and with increasing load, the steady creep rate of the sintered uranium dioxide pellet increases. Under the same load, the steady......
has the advantages of low cost, easy operation, no need for large equipment, high uranium removal rate, and no secondary pollution. It is known that the type and morphology of adsorbents have...-liquid ratio are shown in Figure 6(a) (initial uranium concentration=40 mg/L), with the increase of solid-liquid ratio from 0.2 to 0.5 g/L, the uranium adsorption rate increases from 58.4% to 92.2%. When......
XRD patterns of uranium leaching residue 添加不同氧化剂后浸出尾渣的SEM像如图9所示.由图9可知,添加不同氧化剂后的浸出尾渣形貌具有较大的差异.没有添加任何氧化剂的浸出尾渣以团聚的大颗粒形式存在,说明浸出过程中仅靠浸出液(硫酸)无法破坏其本身的脉石结构,这是导致常规酸浸中浸出时间长,浸出效率低的主要原因.添加氧化剂MnO2和H2O2后,团聚的大颗粒... 浸出尾渣的SEM像 Fig. 9 SEM images of uranium leaching residue 图10 添加不同氧化剂后浸出后尾渣的EDS分析结果 Fig. 10 EDS results of uranium leaching residue 浸出尾渣的EDS分析结果如图10所示.浸出尾渣表面的能谱元素组成基本一致,但添加Fe3+作为氧化......
; 1 Introduction Groundwater contamination caused by uranium mining and milling activities, especially from in situ leaching (ISL.../L H2SO4 was dropped from the column top at a speed of 50-60 drop/min. The dropping process stopped when the U(Ⅵ) level was lower than 0.5 mg/L. The leaching residue of uranium ore in the columns......
is, the lower the uranium recovery will be. As the leaching reaction proceeds, this difference increases at first, and then decreases gradually. In the late phase of leaching, the leaching rate of ore samples...分维数小的矿样的浸出率；随着浸出反应的进行,这种差距先增大而后逐渐减小；最后,粒径分布分维数大的矿样的浸出率依次逐渐超过粒径分布分维数小的矿样的浸出率,并有进一步拉大的趋势. 图4 不同粒径分布分维数矿样铀浸出率随浸出时间的变化曲线 Fig. 4 Variation curves of U leaching rate of uranium ore......
condition are the microwave power of 50 kW, the irradiation time of 30 s, the tailings mass of 2.5 kg. And under this condition, the leaching rate of uranium increases to 80.12%, which is 4.49% higher than... Jiang-hua, RAO Jun. Uranium recovery from uranium mineral bio-heap residues with microbial column leaching prosess[J]. Nonferrous metals (Extractive Metallurgy), 2012(11): 37-40. [5] 陈 伟, 丁德馨, 胡 南, 李......
results (uranium recovery) achieved from the model and experiments. 2.8 Derivative kinetic model The kinetics of leaching can generally be described by a rate expression of the following form [24... as follows: [Fe2+]initial=2.89 g/L, aeration rate 420 mL/min, pH 1.45 and inoculation 6% (v/v). [Fe2+]initial was found to be the most effective parameter. The maximum uranium recovery from the predicted......
Rare earth metals sorption recovery from uranium in situ leaching process solutionsT.S.Dauletbakov22. Department of Nonferrous Metals Metallurgy,Kazakh National Technical University Named After... of uranium sorption in dynamic conditions were investigated. It was identified that D72 resin capacity on analyzed REM was 2.46 mg cm-3 after passing 220 BV(bed volume) of initial solution with 95% recovery......
