Bioleaching of Transition Metals From Limonitic Laterite Deposits and Reassessment of the Multiple Roles of Sulfur-Oxidizing Acidophiles in the Process.
Bioleaching of Transition Metals From Limonitic Laterite Deposits and Reassessment of the Multiple Roles of Sulfur-Oxidizing Acidophiles in the Process.
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DOI：
10.3389/fmicb.2021.703177
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发表时间：
2021
影响因子：
5.2
通讯作者：
Santos AL
中科院分区：
文献类型：
--
作者：
Johnson DB;Smith SL;Santos AL
利用嗜酸细菌催化氧化矿物的还原性溶解是一种创新方法，有助于从褐铁矿中提取有价值的贱金属（主要是钴和镍），否则这些贱金属通常被视为红土开采的废物。优化还原性矿物溶解所需的最合适条件尚未解决，目前的工作重新评估了酸性硫杆菌在这一过程中的作用，并确定了新的方面。零价硫（ZVS）的好氧生物氧化可以产生足够的酸度来抵消氧化铁和锰矿物溶解所消耗的酸度，但阻碍了低氧化还原电位的发展，从而加速了还原过程，尽管铁还原物种对硫的厌氧氧化可以实现这一目标，但产生的酸较少。可溶性铁（III）的有限还原发生在不通过铁呼吸生长的酸性硫杆菌（酸性硫氧化硫杆菌和酸性硫杆菌）的纯培养物中。这种现象（“潜铁还原”）在曝气培养和生物反应器中观察到，并且与使用的电子供体（ZVS或氢）无关。在无菌亲水硫（bio-ZVS）存在下产生足够的亚铁，以促进褐铁矿中Mn （IV）矿物的有效还原溶解和在没有活性亲酸剂的情况下钴的增溶。
Using acidophilic bacteria to catalyze the reductive dissolution of oxidized minerals is an innovative process that facilitates the extraction of valuable base metals (principally cobalt and nickel) from limonites, which are otherwise often regarded as waste products of laterite mining. The most appropriate conditions required to optimize reductive mineral dissolution are unresolved, and the current work has reassessed the roles of Acidithiobacillus spp. in this process and identified novel facets. Aerobic bio-oxidation of zero-valent sulfur (ZVS) can generate sufficient acidity to counterbalance that consumed by the dissolution of oxidized iron and manganese minerals but precludes the development of low redox potentials that accelerate the reductive process, and although anaerobic oxidation of sulfur by iron-reducing species can achieve this, less acid is generated. Limited reduction of soluble iron (III) occurs in pure cultures of Acidithiobacillus spp. (Acidithiobacillus thiooxidans and Acidithiobacillus caldus) that do not grow by iron respiration. This phenomenon (“latent iron reduction”) was observed in aerated cultures and bioreactors and was independent of electron donor used (ZVS or hydrogen). Sufficient ferrous iron was generated in the presence of sterilized hydrophilic sulfur (bio-ZVS) to promote the effective reductive dissolution of Mn (IV) minerals in limonite and the solubilization of cobalt in the absence of viable acidophiles.
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影响因子：
11.4
作者：
Marrero, J.;Coto, O.;Schippers, A.
通讯作者：
Schippers, A.
影响因子：
4.5
作者：
Butt, Charles R. M.;Cluzel, Dominique
通讯作者：
Cluzel, Dominique
影响因子：
4.4
作者：
BROCK, TD;GUSTAFSON, J
通讯作者：
GUSTAFSON, J
DOI：
10.1144/m51-2016-17
发表时间：
2020-01-01
期刊：
NEW CALEDONIA: GEOLOGY, GEODYNAMIC EVOLUTION AND MINERAL RESOURCES
影响因子：
--
作者：
Maurizot, P.;Sevin, B.;Robineau, B.
通讯作者：
Robineau, B.
影响因子：
2.1
作者：
Nancucheo, Ivan;Rowe, Owen F.;Johnson, D. Barrie
通讯作者：
Johnson, D. Barrie