Overview
Pressure oxidation requires a controlled injection of pure oxygen into autoclaves operating at elevated temperatures and pressures. This system supports:
- Refractory gold ore pre-oxidation
- Sulfide concentrate decomposition (pyrite, arsenopyrite, chalcopyrite, etc.)
- Base-metal pressure leaching (copper, nickel)
- Oxidation of arsenic- or carbonaceous-rich ores
The Pressure Oxidation Oxygen Generator uses PSA (Pressure Swing Adsorption) or VPSA technology to separate oxygen from ambient air, delivering 90–95% purity oxygen suitable for direct integration into POX autoclave systems.
Key Advantages
1️⃣ Stable Oxygen Supply for High-Pressure Autoclaves
POX systems demand uninterrupted oxygen at controlled flow and pressure. The generator maintains:
Constant purity
Adjustable flow rate
Fast response to autoclave oxygen demand
Ensures autoclave reaction consistency and stable oxidation kinetics.
2️⃣Significant Cost Reduction Compared to Bulk Oxygen
A mining operation using delivered oxygen often faces:
Cryogenic liquid oxygen purchasing costs
Transportation restrictions
Evaporation losses
Storage tank maintenance
With on-site generation:
Oxygen production costs drop 30–60%
No reliance on external suppliers
No boil-off loss
Predictable operational expenditure
3️⃣Enhanced Metallurgical Performance
Injecting high-purity oxygen supports:
Complete oxidation of sulfide minerals
Increased gold liberation before cyanidation
Reduced reagent consumption in downstream leaching
Improved arsenic fixation when POX produces stable by-products
Higher overall recovery rates
4️⃣Designed for Harsh Mining Environments
The system is engineered with:
Anti-corrosion internal piping
Autoclave-compatible oxygen delivery configuration
Reinforced steel structure
Dust-resistant electrical design
Heat management systems for tropical or high-altitude locations
Working Principle
The Pressure Oxidation Oxygen Generator operates through:
Air compression and filtration
Nitrogen adsorption by molecular sieve materials
Purified oxygen collection in a buffer tank
Distribution to the POX autoclave oxygen injection line
The system automatically regulates pressure and purity to match autoclave reaction requirements.
Technical Features
High Oxygen Purity
Standard: 90–95%
Optional upgrade for ultra-pure oxygen modules
High Output Pressure
Suitable for POX oxygen injection systems or compressors.
Automated Control
PLC with data logging
Real-time O₂ purity monitoring
Remote diagnosis and maintenance
Modular & Expandable
Skid-mounted
Containerized options available
Easy to scale as concentrate production increases
Low Energy Consumption
Optimized PSA cycle reduces kWh/t-O₂ consumption.
Application Areas
The Pressure Oxidation Oxygen Generator is ideal for:
• Refractory Gold Processing Plants
For ores containing:
Pyrite
Arsenopyrite
Organic carbon (partially refractory)
Sulfide-locked gold
• Polymetallic Sulfide Concentrate Treatment
Used in:
Copper POX
Zinc POX
Nickel matte oxidation
• Arsenic-bearing Ores
Where stable arsenic immobilization is required.
• High-Altitude Mines
Where oxygen delivery is difficult or costly.
Benefits for Mine Operators
1. Increased Gold Recovery
POX exposes finely disseminated gold within sulfide structures, improving downstream cyanidation efficiency.
2. Better Autoclave Reaction Control
Stable oxygen availability prevents:
Incomplete oxidation
Temperature fluctuations
Poor sulphur conversion
3. Lower Operating Costs
Reductions in:
Liquid oxygen purchase
Logistics
Storage tank operation
Energy waste from handling evaporated oxygen
4. High Operational Safety
No handling of cryogenic liquids, no transportation hazards.
5. Greater Process Reliability
Autoclave systems require continuous oxygen supply; onsite generators prevent shutdowns caused by delivery delays.
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