Platinum, palladium and gold leaching from magnetite ore, with concentrated chloride solutions and ozone

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Nuwaysolutions
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Platinum, palladium and gold leaching from magnetite ore, with concentrated chloride solutions and ozone

Post by Nuwaysolutions » November 30th, 2017, 11:58 am

There is an article in a hydrometallurgy magazine volume 166 dec. 2016. They use salt and ozone to digest pgms from magnetite. Could this work as a type of Aqua Regia in other ores? I pasted a brief section of the article that they show for free. Have to pay for the full article.

A leaching process for platinum contained in a magnetite ore was studied, as an alternative process to cyanidation and aqua regia digestion. The proposed process employs concentrated chloride solutions and ozone gas injection during the entire leaching process. The effect of pH, chloride concentration and temperature was analyzed. Under atmospheric pressure at a temperature below 30 °C, after 3 h of leaching, metal extraction > 90, 70 and 50% was attained for Pt, Pd and Au, respectively. The apparent activation energies for Pt, Pd and Au were found to be 44, 39 and 23 kJ/mol, respectively. The magnetite mineral matrix was not attacked during the leaching of platinum group metals.


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g_axelsson
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Re: Platinum, palladium and gold leaching from magnetite ore, with concentrated chloride solutions and ozone

Post by g_axelsson » November 30th, 2017, 4:58 pm

Torres, R., Lapidus, G.T., Platinum, palladium and gold leaching from magnetite ore,with concentrated chloride solutions
and ozone, Hydrometallurgy (2016), http://dx.doi.org/10.1016/j.hydromet.2016.06.009

For those with access.

Sounds a lot like hydrochloric acid and hydrogen peroxide.

Göran
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