Difference between revisions of "Team:Aix-Marseille/Integrated Practices/Process"

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{{:Team:Aix-Marseille/Template-Top|Process}}<!-- le titre est là -->
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{{:Team:Aix-Marseille/Template-Top|Our process}}<!-- le titre est là -->
  
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Nowadays, the platinum is drawn along a linear pathway. Platinum is produced in mines, especially in South Africa (lien [[Team:Pretoria_UP|Pretoria]]) Russia and Zimbabwe where it is found in relative high concentration around 5ppm<ref>Bau and al., 2015 http://dx.doi.org.gate1.inist.fr/10.1016/j.hydromet.2015.01.002</ref>.  These absolute concentrations are rather lower than most of metal, so platinum in often a by-product of another mined resource as nickel or coal.
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==Our Process is applicable on many ways==
  
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Actually its extraction is realized by leaching the ore with chemicals (Clhorhydric acid, Aqua regia). This leaching can be supplemented with bioleaching.
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Our process can begin with many different sources. As platinum accumulate in many places, its recovery can begin from a lot of places and substrates. In fact only [[#The Source|the source]] of our project would change if the basic matter change. Moreover, solution of phytoremediation
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==The Source==
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Sewage Sludge
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(Incineration)
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Ashes
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==Bioleaching==
  
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The process we’ve designed allow to shape the economy in a circular way. Instead of being wasted in environment, platinum is re injected in economy.  
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The Bioleachning process allow a far better recovery of platinum. Indeed, the drop of pH is required for the metals  solubilization. This step is usually realized with chemicals as chlorhydric acid in the actual industry. But in order to achieve a greener process as possible, we decided to lower the pH with biological ways, as the leachning accomplished by ''Thiobacillus''. This method is widely use in mines, e.g. for copper mines in South America, so this  will be a reliable step already tested in industrial conditions.
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This method rely on the ability of the bacteria ''Thiobacilus'' to acidify its medium until a pH of 1. The bacterium solution is  applied on the ashes and liquid part dropping from it constitute the leachate i.e. a very acidified solutions containing solubilized metals particles mostly in ionic form.
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This step wouldn't be obligatory in our process, but it could improve our recovery yield while  still using keeping a environmentally friendly approach.
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==Recovery==
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Once the platinum is leached, we need to recover it. Our process is
  
  
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Revision as of 16:33, 7 September 2016