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. The separation and purification of leaching uranium fungi study[J]. Journal of South China University (Natural Science Edition), 2010, 24(4): 33-35. [22] KUMAR R, SINGH R, KUMAR N, BISHNOI K, BISHNOI N... pH for uranium adsorption on immobilizing Aspergillus niger activated carbon 当pH值为2时,微球对铀的吸附量较小, 这可能是由于此时大部分铀水解离子以UO22+形式存在,不易发生水解反应,并且溶液中存在大量的氢离子和铀酰离子竞争固定化黑曲霉活性炭微球表面的活性位点,从而微球表面被质子化,微球表面与铀酰离子之间只形成弱的......
at atmospheric pressure and oxidizing acid pressure leaching were studied separately by contrasting conclusion. The results show that the leaching rate of vanadium of oxidizing acid pressure leaching... ℃ and the dosage of catalyst is 2.5% of the stone- coal. Key words: stone-coal; vanadium; oxidizing acid leaching; catalyst; leaching rate ......
of Science and Technology,Kunming 650093, China) Abstract: The effect of ferrous sulfate on the leaching rate of vanadium by one step leaching process was carried out. The results show that with proper amount of additive the leaching rate of vanadium can be improved by 8.5%. Different gaseous pressure acid leaching experiments show that industrial oxygen can be substituted for dry air......
Effect of mechanical activation on alkali leaching of chromite ore ZHANG Yang(张 洋)1, 2, ZHENG Shi-li(郑诗礼)1, DU Hao(杜 浩)1, XU Hong-bin(徐红彬)1, ZHANG Yi(张 懿)1 1. National Engineering Laboratory.... It is observed that the extraction ratio reaches 97% after leaching for 200 min when chromite ore is mechanically activated for 10 min, but only 34% if not activated. Mechanical activation can decrease......
exist salt in the experimental materials. The changing curve of leaching rate with time can be figured out, as shown in Fig. 3. According to Fig. 3, the leaching rate increases gradually with the reaction progress. Furthermore, it performs an evolution of initial fast-increasing, midterm slow-increasing and final stabilizing. Early in the leaching process, the leaching rate of low grade samples......
从氯化渣中浸出钪的研究李亮1(1.四川省攀枝花市攀枝花学院 材料工程学院)摘 要:以富集钪后的氯化渣为原料,研究了浸出酸种类,原料粒度,浸出酸浓度,浸出液固质量比,浸出温度和浸出时间对钪浸出率的影响.条件试验和正交试验表明,最佳试验条件为:浸出酸种类为硫酸;浸出酸浓度为40%;原料粒度为44μm(325目);浸出液固质量比为3.5;浸出温度70℃;浸出时间为8h.浸出温度,浸出液固质量比和浸出酸浓度对钪浸出率的影响大小依次为:浸出温度>浸出液固质量比>浸出酸浓度.稳定试验表明:钪的浸出率在95%以上......
energy is reduced from 150 kJ/mol to 58, 49 and 45 kJ/mol, respectively. So the chemical reaction speed is accelerated markedly. Key words: mechanical activation; reaction kinetics; leaching rate 镍...; 文献标志码:A 文章编号:1672-7207(2010)06-2085-06 Effect of mechanical activation on leaching kinetics of pyrrhotite ZHANG You-xin, HE Li-hua, LIU Xu-heng......
from black shale by pressure acid leaching was investigated. The influences of changing parameters of pressure acid leaching process on the leaching rate of vanadium were discussed, and the experiment... relation to occupation ratio of vanadium in in-soluble silicoaluminate mineral. Key words: black shale; acid pressure leaching; ferrous sulfate; vanadium; leaching rate ......
温度下的Li碳化浸出率 Fig. 5 Li carbonization leaching rate at different roasting temperatures 2.3.2 焙烧时间对水浸提锂的影响 保持焙烧温度为650 ℃,含碳量20%不变,考察不同焙烧时间(1,2,3,4和5 h)对水浸提锂的影响,结果如图6所示.从图6可见:随着焙烧时间延长,Li浸出率呈现出先上升后下降的趋势,在焙... Li carbonization leaching rate under different roasting time 图7 物料含碳量不同时的Li碳化浸出率 Fig. 7 Li carbonization leaching rate under different carbon mass fractions 2.4 焙烧物料表征 2.4.1 焙烧产物XRD表征 通过不同焙烧条件下单因素实验......
size and leaching time on dissolution rate of the main metals in the samples were investigated. The prepared leaching solution with the desired hydrochloric acid concentration was placed into a 1 L.... The reaction temperature was controlled by an isothermal water bath with a digital thermometer (within ±1 ℃). The reaction mixture was agitated at a fixed rate of 250 r/min. The effect of leaching time......
