Chemical Technology June 2015

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24 Chemical Technology • June 2015
The result of decades of experience and
continuous development in precious metals
processing technology, the Outotec Hydro-
metallurgical Precious Metals Process was
originally developed for the treatment of
anode slime generated in copper electrore-
fining. Its cost-effective, modular approach
can be adapted for a variety of different
applications and can also be combined with
other precious metals technologies such as
the Outotec Selenium Roasting Furnace,
Outotec TROF, or Kaldo Furnace.
The process ensures effective separa-
tion of impurities with high recovery. Impuri-
ties can be converted into saleable products
such as selenium, copper telluride, and lead
sulfate to improve operational profitability.
The recovered silver and gold are of a high
grade and are melted and cast into ingots
or granules.
Operation is straightforward, with the pro-
cess comprising simple leaching, filtration,
and precipitation steps
that are either sulfuric or
hydrochloric acid based.
The chemicals used do
not form highly toxic
compounds and can be
mostly recycled for re-
use within the process.
This reduces both waste
water volumes and fresh
water consumption.
Effective off-gas clean-
ing not only improves working conditions
and reduces environmental impact, it also
improves precious metals recovery by allow-
ing any metal traces that remain as droplets
in off-gases to be captured.
Key benefits include:
• High direct recovery and high end-product
quality with low inventories
• Quick process with high level of automa-
tion to enable consistent end-product
quality and smooth operation
• Flexible and cost-efficient modular
process design
• Recovered impurities can be sold as by-
products instead of being disposed of
• Low environmental impact with no flue
dust or slag generation.
Formoreinformation, email ,
or go to
Cost-effective, flexible, and sustainable production with Outotec
The Outotec
modular process
enables high
direct recoveries
with low inven-
tory, has a low
environmental
impact, and can
be adapted for
a wide variety of
applications.
The process ensures effective separation of impurities.
• CORROSION AND COATINGS
• PUMPS AND VALVES
• DESIGN AND MATERIALS OF CONSTRUCTION
• PETROCHEMICALS
• WATER TREATMENT
• CONTROL AND INSTRUMENTATION
• PLANT MAINTENANCE, HEALTH,
SAFETY AND QUALITY
• NANOTECHNOLOGY
J U LY A U G U S T
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