Biolixiviação de Urânio

1. H+
 Fe2+
producedinreactionmustbe re-oxidizedtoFe3+
andrecycled.
 A rapiduraniumextractionneedsahighFe3+
/Fe2+
ratio
 Indentifythe heterotrophicmicroorganisms
 Run an orbital shakerexperimenttoreachthe optimizedconditionsforthe
microorganimstomaximize the uraniumextraction
 Bioleachingusinganextendedparticle sizerange (3mm - ½ " )
 Use a High pressure grindingrollsforcrushingthe ore (Micro-cracks)
 Run experimentsusingabiggercolumnwithasprayingnozzle toensure amore
homogeneousleachingcondition
H2SO4
𝑈𝑂3 + 2𝐻+ → 𝑈𝑂2
2+
+ 𝐻2 𝑂
UO2 + 3Fe3+
UO2
3+
+ 3Fe2+
𝑈𝑂2 + 3𝐹𝑒3+ → 𝑈𝑂2
3+
+ 3𝐹𝑒2+
UO3 + 2H+
UO2
2+
+ H2O
𝐸 = 𝐸1
0
+ 0,0592 .log
[𝐹𝑒3+]
[Fe2+]
𝐸ℎ 𝛼
[𝐹𝑒3+]
[Fe2+]

3. 𝑈𝑂2 + 2𝐹𝑒3+ ⇌ (𝑈𝑂2)2+ + 2𝐹𝑒2+
𝐹𝑒𝑆2 + 7𝐹𝑒2(𝑆𝑂4)3 + 8𝐻2 𝑂 ⇌ 15 𝐹𝑒𝑆𝑂4 + 8𝐻2 𝑆𝑂4

4. 𝑈𝑂2
2+
+ 3𝐻2 𝑂 → 𝑈𝑂2(𝑂𝐻)2. 𝐻2 𝑂 + 2𝐻+
𝐹𝑒2+ 𝐹𝑒3+

5. UO2
2+
+ 3SO
Fe2+
Oxidante Fe3+
𝑈𝑂2
2+
+ 3𝑆𝑂4
2−
→ [𝑈𝑂2(𝑆𝑂4)3]4−
𝑈𝑂3 + 2𝐻+ → 𝑈𝑂2
2+
+ 𝐻2 𝑂