Microbiological leaching of uranium ores

Sulfur enhancement effects for uranium bioleaching in column reactors from a refractory uranium ore

“…As can been seen in Table 2 , the elements Al, Na and Mn were dissolved into the leach liquor simultaneously, resulting in a decrease of the content in the leaching residues. The content of Ca, Fe and K on the residue surface was 2–3 times that of the raw ore. We infer that jarosite as the passivation layer was formed on the surface of the residues (Tuovinen and Bhatti, 1999 ; Yang et al, 2022 ). As the upper layer had higher uranium extraction, the passivation layer was most likely formed in the lower layer of the column reactors.…”

“…Bioleaching has been extensively applied in the extraction of metals (e.g., copper and gold) from low-grade ores (Klaus, 1997 ; Rawlings, 2002 ; Abhilash and Pandey, 2013a ; Srichandan et al, 2019 ; Wang et al, 2019 ; Kaksonen et al, 2020 ; Roberto and Schippers, 2022 ). It has been proved to be an effective approach to extract uranium from low-grade or complex refractory ores because of its economic feasible and environmentally sustainable (Tuovinen and Bhatti, 1999 ; Abhilash and Pandey, 2013a ; Wang et al, 2019 ; Kaksonen et al, 2020 ). Bioleaching microorganisms play a critical role in the oxidative decomposition of many sulfide ores (Liao et al, 2020 ; Yin et al, 2020 ).…”

Water Management at Abandoned Flooded Underground Mines

“…Furthermore, the release of Fe 3+ is a process induced by disulphide oxidation (Nordstrom 1977;Tuovinen and Bhatti 1999): Furthermore, the release of Fe 3+ is a process induced by disulphide oxidation (Nordstrom 1977;Tuovinen and Bhatti 1999): …”