Expansion Experimental Study for Rapid Oxidation of Fe2+ in Adsorption Tail Solution of In-situ Uranium Leaching by a Bacteria in Field in Xinjiang
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摘要: 为了节省酸法浸铀过程中氧化剂用量，以多孔耐酸陶粒作载体固定耐冷嗜酸硫杆菌，在新疆某酸法地浸采铀矿山构建了高7.0 m、内径2.0 m、总容积17.8 m3的新型高效生物反应器，进行快速氧化地浸采铀吸附尾液中Fe2+扩大试验研究。研究结果表明，在现场温度为5~24℃、吸附尾液中Fe2+浓度为200~300 mg/L、通气量为59.0 m3/h时，生物反应器的最大流量可达28.2 m3/h，Eh（氧化还原电位）大于570 mV，尾液中Fe2+在低温环境下可被快速完全氧化。该试验结果为细菌代替氧化剂氧化吸附尾液中Fe2+的拓展应用提供了借鉴意义。Abstract: In order to save the amount of oxidants for acid leaching of uranium, a new type of high-efficiency bioreactor with 7.0 m in height, 2.0 m in inner diameter and 17.8 m3 in total volume was designed and constructed in a uranium mine of Xinjiang, porous acid resistant ceramsites were selected as the carriers of bacteria, and the Fe2+ in the tail liquor of in-situ leaching of uranium by Acidithiobacillus ferrivorans immobilized on the carriers at low temperature, to carry out an extended experimental study. The results showed that the maximum flow rate of bioreactor was 28.2 m3/h when Fe2+ concentration was 200~300 mg/L and aeration rate was 59.0 m3/h under the condition of 5~24 ℃ in the field, and the Fe2+ in the tail liquor could be oxidized rapidly and completely when the Eh(Redox potential) was above 570 mV. This experiment provides reference significance for the application of bacteria instead of oxidant to oxidize and adsorb Fe2+ in tail liquor.
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Key words:
- in-situ leaching of uranium /
- bioreactor /
- acidithiobacillus ferrivorans /
- ferrous oxide
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表 1 吸附尾液成分
Table 1. Components of adsorption tail solution
Component SO42- PO43- Cl- Fe2+ ∑Fe Ca2+ Mg2+ NH4+ K+ Na+ U Content/(mg·L-1) 8 450 1.85 250 323 525 635 520 82 28.6 456 < 0.5 
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