Metallic ions catalysis for improving bioleaching yield of Zn and Mn from spent Zn-Mn batteries at high pulp density of 10%

Catalytic potential of selected metal ions for bioleaching, and potential techno-economic and environmental issues: A critical review

“…1% w/v (Zeng et al, 2013). The process efficiency decreases at higher pulp density due to the presence of alkaline wastes or metal toxicity to leaching microorganisms (Niu et al, 2015). The maintenance of optimum particle size in the reactor is another concern, as the presence of very fine particles (<25 µm) can negatively impact the activity of cells due to attrition caused by increased particle-particle collision (Nemati et al, 2000).…”

“…and non-metallic catalysts (activated carbon, light illumination, waste newspapers, polyethylene glycol, etc.) have been used to improve bioleaching efficiency (Ballester et al, 1990;Liu et al, 2015;Niu et al, 2015;Panda et al, 2015a;Zhou et al, 2015). However, the use of metal ions as a catalyst has gained most attention, as nonmetallic catalysts have produced relatively poor bioleaching yields of as low as 12.5% (Zhang et al, 2016) and also require large amounts of catalysts of up to 2500 g/kg of ore (Dong et al, 2013) to obtain significant leaching yields.…”

A multilevel sustainability analysis of zinc recovery from wastes

“…Adding metallic ion catalyst can potentially enhance the rate of electron transfer and thus improving the extraction performance (Niu et al, 2015). Niu et al (2015) demonstrated that the extraction efficiency of zinc from spent batteries can be enhanced from 47.7% to 62.5% through the addition of 0.8 g/L of Cu 2+ catalyst.…”

“…Adding metallic ion catalyst can potentially enhance the rate of electron transfer and thus improving the extraction performance (Niu et al, 2015). Niu et al (2015) demonstrated that the extraction efficiency of zinc from spent batteries can be enhanced from 47.7% to 62.5% through the addition of 0.8 g/L of Cu 2+ catalyst. Xiang et al (2015) investigated the feasibility of vacuum separation followed by inert gas condensation to recover zinc from spent zinc manganese batteries to produce zinc nanoparticles such as nano hexagonal prisms (diameter 100-300 nm), fibriform and sheet shapes.…”

Effect of FE(II) Concentration on Bioleaching of Zinc from Sphalerite using Leptospirillum Ferriphilum: Kinetic Aspects

“…Among the most altogether considered microorganisms, Acidithiobacillus ferrooxidans is important in bioleaching of sulfide mineral [5,6] because it can oxidize both iron and sulfur. However, the members of genera Leptospirillum have been gaining special attention as bioleaching microorganisms because they can tolerate lower pH, have higher redox potential, can withstand higher cultivation temperature, and have higher affinity toward sulfide minerals compared to A. ferrooxidans [7][8][9]. It is outstandingly known that Leptospirillum ferrooxidans and Leptospirillum ferriphilum are the two most regular species under the genus Leptospirillum; the latter can endure lower pH and is more extremophile [10,11], thus was chosen as the objective bacterium for this study.…”