Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction 2017-04-04T06:57:36+00:00
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Pressure Leaching of Nickel (1 reply)

Ozgun
7 months ago
Ozgun 7 months ago

    In HPAL (High Pressure Acid Leaching) of nickel, pressure leaching is used to be done in pachuka tanks but it has become obsolete and instead of pachuka tanks, titanium lined autoclaves are being used. From a technical point of view how can titanium lined autoclaves can replace pachuka tanks? What are their differences? How are titanium lined autoclaves better than pachuka tanks? Thank you so much for your time.     

Rheomet
7 months ago
Rheomet 7 months ago
1 like by David

If you are referring to laterite Ni-Co leaching, HPAL is a well established process (Moa Bay, Murrin Murrin, Coral Bay, Ambatovy, etc.). It is essentially an acid digestion, but recovery is increased and residence time shortened through the use of high temperatures (255°C -270°C) which in turn need high pressure (4,000 kPa – 5,300 kPa).  These conditions need the titanium lining, but you can find decent acid-brick lining options, try Stebbins folks for example. Cheers, Alex.


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