Outotec® Gold Processing Solutions
MINExpo 2016, September 26-28
Carolina Salas
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Introduction – why pretreatment
Gold Processing Route
Direct CN-Leaching
Process
Ore types
1. Placers
2. Quartz vein-Iode ores
3. Oxidized ores
4. Silver-rich ores
5. Copper sulfide ores
6. Iron sulfide ores
7. Arsenic sulfide ores
8. Antimony sulfide ores
9. Bismuth sulfide ores
10.Telluride ores
11.Carbonaceous sulfide ores
More free-milling
Sulfide Sulfur (S)
• Prevent contact of gold with cyanide solution
Carbon (C)
• Fine carbon content reacts like the activated
carbon by adsorbing the gold onto its surface
and decreasing the gold recovery dramatically
Arsenic and Antimony (As, Sb)
• As & Sb are decomposed in the conditions for
gold leaching and the reactions consume
large quantities of oxygen and cyanide
More refractory
Refractory Ore Process
(source: Zhou, Gold Workshop, Saimm 2009)
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What is Outotec-BIOX®
• Bio-oxidation is a bio-hydrometallurgical process for the pre-cyanidation
treatment of refractory gold concentrates to oxidize metal sulphides to metal
sulphates including:
• Tank Bioleaching
• Heap Bioleaching
• BIOX® is patented process using stirred tank reactors
• The patent and all rights to the process is owned by Outotec
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A simplified Outotec-BIOX® Flowsheet
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BIOX® Operations
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OUTOTEC - Gold POX technologies
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Outotec autoclave plant unit for Sulphur oxidation
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Outotec autoclave train for pressure oxidation
We have up-to-date pressure oxidation technology knowhow
• Outotec recently supplied engineering, process equipment and pressure
oxidation technology to Petropavlovsk PCL, the second largest gold producer in
Russia
• Outotec is currently providing engineering and pressure leaching technology for
Cengiz Group in Turkey
Benefits
• Reduced risk
• Lifetime partnership – from
laboratory to operations
• Process guarantees
• Fast supply and installation
due to modular design
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Roasting
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Gold leaching and recovery
• Outotec can provide both carbon-in-pulp (CIP) and carbon-in-leach (CIL)
plants as pre-design Outotec OKTOP® CIL and CIP Reactor Plant Unit
including cyanide detoxification
• Outotec is currently supplying engineering and CIP Reactor Plant Unit for
Cengiz Group in Turkey
Outotec equipment for gold cyanide
leaching and recovery:
• OKTOP® Reactors and pre-designed
Leaching Plant modules for cyanide leaching
• Elution plant and gold room
• Cyanide Destruction plant
• Outotec dewatering solutions
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Outotec pre-designed plant units for gold processing
• We can provide pre-designed plant units for comminution, flotation, pressure
oxidation, roasting, gold leaching and recovery as well as effluent treatment with
analyzers and automation systems
Benefits
• One responsible supplier for the package
providing mechanical and performance
guarantees for the entire plant unit
• Pre-designed plant units with Outotec
proprietary equipment reduce required
engineering and shorten total delivery time
• Clear battery limits for engineering and
implementation
• Plant Units equipped with state of the art online analyzers and advanced process
control provide maximal process
performance
• Safe operation and maintenance
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Tailings and effluent treatment
• Outotec provides tailored water treatment solutions to produce water that
meet environmental discharge concepts and maximize water recycling.
• Outotec offers paste thickening and filtration solutions for tailings to improve
water re-usage and minimize the tailings disposal area.
Outotec equipment for tailings treatment plant:
• Outotec® Thickeners and paste thickeners
• Outotec Larox® Filters
• Outotec paste plant
• Mine backfill and landfill plants
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Summary
Outotec can offer
• Proven technologies covering the
total gold production chain
• A full range of services that are
tailor-made to the customer‘s
needs
• Reduced risk
• The optimal technology fit and
process performance
• Process guarantees
• Fast supply and installation due to
modular design
• Lifetime partnership – from
laboratory to operations
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To Learn More
• For more information please visit our website:
www.outotec.com
• Send me an email: [email protected]
Find this presentation at www.outotec.com/mine16
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