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Engineer's Allure
This Forum is the only Pakistan's platform dedicated to engineering & science disciplines. So join us & open up channels for technical discussions. If you are a Professional Engineer or a Teacher Contact Us ...& you may be accepted as Forum Moderator Smile
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BioHeapLeaching Process

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BioHeapLeaching Process Empty BioHeapLeaching Process

Post by ioncube Mon Jul 02, 2012 6:03 pm

This process is practised to separate distinct metals from multi-metals ore deposit sites.
In the process (diagram), the crushed ore is piled on a pad into 8m high stacks. Piping at the bottom of the heap supplies aeration to the stacked ore. A leach solution, containing mesophilic* and thermophilic** bacteria indigenous to the region (Sotkamo, Finland) is circulated through the stack from the top. As the bacteria oxidize large quantities of pyrrhotite and pyrite, the exothermic reaction elevates the temperature to over 50°C — even when ambient conditions are at –20°C. After the metals are leached from the ore — which takes about 1.5 yr — the metals can be recovered from the pregnant leaching solution by precipitation and filtration.

Bioleaching is said to be more environmentally friendly for extracting metals than traditional smelting because it generates no gaseous emissions and requires less energy.
BioHeapLeaching Process Biolea10

*A microorganism that grows best at 20° to 55°C.
**An organism that thrives at a temperature of 50°C or higher.

A video showing basic operations:



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ioncube


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