Muravyov Maxim, Panyushkina Anna
Winogradsky Institute of Microbiology, Research Centre «Fundamentals of Biotechnology» of the Russian Academy of Sciences, Leninsky Ave., 33, bld. 2, 119071 Moscow, Russia.
Microorganisms. 2020 Mar 10;8(3):386. doi: 10.3390/microorganisms8030386.
A two-step process, which involved ferric leaching with biologically generated solution and subsequent biooxidation with the microbial community, has been previously proposed for the processing of low-grade zinc sulfide concentrates. In this study, we carried out the process of complete biological oxidation of the product of ferric leaching of the zinc concentrate, which contained 9% of sphalerite, 5% of chalcopyrite, and 29.7% of elemental sulfur. After 21 days of biooxidation at 40°C, sphalerite and chalcopyrite oxidation reached 99 and 69%, respectively, while the level of elemental sulfur oxidation was 97%. The biooxidation residue could be considered a waste product that is inert under aerobic conditions. The results of this study showed that zinc sulfide concentrate processing using a two-step treatment is efficient and promising. The microbial community, which developed during biooxidation, was dominated by , and sp. At the same time, and played crucial roles in the oxidation of sulfide minerals and elemental sulfur, respectively. The addition of to during biooxidation of the ferric leach product proved to inhibit elemental sulfur oxidation.
之前曾提出一种两步法工艺，该工艺包括用生物生成的溶液进行铁浸出以及随后用微生物群落进行生物氧化，用于处理低品位硫化锌精矿。在本研究中，我们对锌精矿铁浸出产物进行了完全生物氧化过程，该产物含有9%的闪锌矿、5%的黄铜矿和29.7%的元素硫。在40°C下进行21天生物氧化后，闪锌矿和黄铜矿的氧化率分别达到99%和69%，而元素硫的氧化水平为97%。生物氧化残渣可被视为在有氧条件下呈惰性的废弃物。本研究结果表明，采用两步处理法处理硫化锌精矿是高效且有前景的。生物氧化过程中形成的微生物群落以 、 和 菌属为主。同时， 和 分别在硫化物矿物和元素硫的氧化中起关键作用。在铁浸出产物的生物氧化过程中添加 至 被证明可抑制元素硫的氧化。
