Biooxidation and precipitation for iron and sulfate removal from heap bioleaching effluent streams

Simultaneous oxidation and precipitation of iron using jarosite immobilized Acidithiobacillus ferrooxidans and its relevance to acid mine drainage

“…Ferrous iron oxidation by A. ferrooxidans in 9K medium at pH 2.5 favored the precipitation of jarosite (Daoud and Karamanev, 2006;Gramp et al, 2008;Nurmi et al, 2010). When Fe 2+ was exhausted, cultures were filtered to retain jarosite and discard supernatants.…”

“…Some immobilization studies described jarosite as an undesirable product because its precipitation within the carrier matrix may cause clogging and Hydrometallurgy 125-126 (2012) 152-156 mass transfer barriers. However, such problems can be avoided by using fluidized-bed reactors (Nemati et al, 1998;Nurmi et al, 2009Nurmi et al, , 2010.…”

Synthesis and properties of ternary (K, NH4, H3O)-jarosites precipitated from Acidithiobacillus ferrooxidans cultures in simulated bioleaching solutions

“…Nevertheless, the hydronium ion often partially substitutes for other monovalent cations in the "A" position of biogenic jarosite precipitates formed under ambient conditions. Jarosite mineral precipitation can be employed as a means of controlling ferric iron and sulfate concentrations in recirculating acid leach solutions [21,22]. Jarosite type minerals can be problematic in the bioleaching of chalcopyrite (CuFeS 2 ), contributing to passivation of the leaching as they precipitate on chalcopyrite surfaces as secondary solid phase oxidation products [23,24].…”

Isotherm and Kinetics of Fe(II) Adsorption onto Chitosan in a Batch Process

“…Different methods have been used to remove iron removal of Fe(II) by chitosan to investigate the from aqueous solutions such as Electrocoagulation [3], adsorption mechanism. Also equilibrium data were ion exchange [4], precipitation [5], extraction [6], analyzed in terms of different isotherm models and model membrane technologies [7], adsorption [8], etc. Cost, parameters were recovered using a nonlinear fit o f complexity and efficiency are important factors that affect experimental data to the model equation.…”