Bioleaching phosphorus from fluorapatites with acidophilic bacteria

Priha, O., Sarlin, T., Blomberg, P., Wendling, L., Mäkinen, J., Arnold, M. and Kinnunen, P. (2014) Bioleaching phosphorus from fluorapatites with acidophilic bacteria. Hydrometallurgy, 150 269-275. doi:10.1016/j.hydromet.2014.08.002


Author Priha, O.
Sarlin, T.
Blomberg, P.
Wendling, L.
Mäkinen, J.
Arnold, M.
Kinnunen, P.
Title Bioleaching phosphorus from fluorapatites with acidophilic bacteria
Journal name Hydrometallurgy   Check publisher's open access policy
ISSN 0304-386X
1879-1158
Publication date 2014-12-01
Sub-type Article (original research)
DOI 10.1016/j.hydromet.2014.08.002
Open Access Status
Volume 150
Start page 269
End page 275
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2015
Language eng
Abstract Currently known high grade easily-acquirable phosphate rock reserves are depleting. The objective of this study was to evaluate the potential application of bioleaching technology to the recovery of phosphorus from different phosphate ore materials, and isolate indigenous phosphorus-solubilising bacterial strains from them. In the bacterial enrichment and isolation experiments no growth was detected in the medium designed for acidophiles. Heterotrophic phosphorus solubilising isolates were enriched from the fluorapatite concentrate, and all four isolates were most closely related to Burkholderia fungorum. Bioleaching of phosphorus from low grade fluorapatite ore containing 8.2% P2O5 and from fluorapatite concentrate containing 29.8% P2O5 was carried out in shake flasks. Supplemental elemental sulphur was added as an energy source for acid generation. Mixed and pure acidophilic bacterial cultures consisting of iron- and/or sulphur-oxidizing bacteria Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferrooxidans were used in the experiments. These acidophiles are commonly used in bioleaching of sulphide minerals, but their application to phosphorus solubilisation has until now been limited. Phosphorus leaching was shown to be a pH-dependent phenomenon. Phosphorus bioleaching yields of up to 97% and 28% were obtained in 21 d for low grade fluorapatite ore and concentrate, respectively, in solutions with a 1% solid content. With adaptation, the bacterial mixture was acclimated to suspensions with a 10-30% solid content. These results indicate a potential for the application of bioleaching to phosphorus extraction of low grade materials.
Keyword Phosphorus
Apatite
Bioleaching
Low-grade ores
Acidithiobacillus
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Agriculture and Food Sciences
 
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Created: Tue, 02 Dec 2014, 15:38:25 EST by Laura Wendling on behalf of School of Agriculture and Food Sciences