کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
212181 462035 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Bioleaching phosphorus from fluorapatites with acidophilic bacteria
ترجمه فارسی عنوان
فسفر بیولوژیک از فلوراپاتیت با باکتری اسیدوفیلیک
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• High grade, easily accessible phosphate reserves are becoming depleted worldwide.
• In this study, phosphorus bioleaching from fluorapatite was pH-dependent.
• Phosphorus yields of ≤ 97% were obtained in 21 d in solution with a 1% solid content.
• Adaptation facilitated bioleaching of phosphorus from solutions with 10–30% solids.
• Phosphorus bioleaching technology is potentially applicable to low-grade materials.

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hydrometallurgy - Volume 150, December 2014, Pages 269–275
نویسندگان
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