Oxygen Enrichment Plant For Cyanidation

The Oxygen Enrichment Plant applies Pressure Swing Adsorption (PSA) technology to generate oxygen onsite from ambient air. By delivering oxygen concentrations typically between 90–95%, the system provides mining operators with a dependable alternative to bulk liquid oxygen supply chains.

It is engineered for:

• Gold processing facilities using cyanidation
• Remote mining sites requiring continuous, local oxygen production
• Projects seeking operational cost reduction and stable oxygen availability
• Expansion or modernization of existing leaching circuits

The plant operates with fully automated control, enabling round-the-clock oxygen production with minimal manpower.

Gold dissolution in cyanide solution follows the Elsner equation, which shows that oxygen is a critical reactant. Low dissolved oxygen slows the leaching reaction, prolongs residence time, and increases cyanide waste.

Key benefits of oxygen enrichment include:

• Faster leaching kinetics in CIL/CIP tanks
• Improved gold recovery rate across full extraction cycles
• Better CN⁻ utilization, reducing chemical cost
• Lower residual cyanide concentration in tailings
• More stable process control, especially in refractory ore processing

With a consistent oxygen supply, operators gain greater control over metallurgical performance, increasing production rates and overall profitability.

High Oxygen Purity (90–95%)

Optimized for cyanidation efficiency, the system ensures a constant supply of concentrated oxygen suitable for tank leaching, peroxide sparging replacement, and dissolved oxygen (DO) boosting.

24/7 Continuous Oxygen Generation

Designed for uninterrupted operation even in harsh mining environments.

Energy-Efficient PSA Technology

Low kWh consumption per Nm³ of oxygen produced, reducing operational expenditure.

Skid-Mounted, Modular Construction

Compact modules allow quick transportation, plug-and-play installation, and flexible capacity expansion.

Advanced Monitoring & DO Integration

The system can integrate with:

DO probes in leach tanks

Flow control devices

SCADA monitoring
to ensure optimal oxygen dosing.

Minimal Maintenance Requirements

Only routine filter changes and periodic adsorbent inspection are needed.

Durable Industrial Build

Corrosion-resistant frames, industrial-grade valves, and extended-life molecular sieves ensure long service life.

The plant consists of an air compressor, air treatment system, PSA oxygen generator, oxygen buffer tank, and distribution manifold.

Working steps:

✅Air Compression – atmospheric air is compressed.

✅Filtration & Drying – oil, moisture, and impurities are removed.

✅PSA Oxygen Separation – nitrogen is selectively adsorbed by zeolite, leaving oxygen as product gas.

✅Purity Stabilization – oxygen is stored and equalized in a buffer tank.

✅Delivery to Cyanidation Process – via pipelines, dissolvers, or sparging systems.

All processes are automated through PLC control.

CIL & CIP Leaching Circuits

Direct sparging into agitated tanks ensures dissolved oxygen levels remain above process thresholds, improving reaction rates and carbon adsorption efficiency.

Heap Leaching Projects

Oxygen-enriched gas is injected into:

drip irrigation lines

solution distribution manifolds

dedicated oxygen injection wells

to increase oxidation efficiency in deeper ore layers.

Oxygen Booster for Refractory Ores

When used in circuits handling partially oxidized, double-refractory, or sulfide-bearing ore, oxygen enrichment enhances the breakdown of sulfur species and prevents oxygen starvation during cyanidation.

Process Upscaling

A continuous oxygen source allows operators to increase throughput without requiring significant tank volume expansion.

Higher Gold Recovery

Many operations report improved recovery due to accelerated gold dissolution.

Reduced Cyanide Consumption

More efficient oxidation reduces excess chemical use.

Lower Operating Costs vs. Liquid Oxygen

PSA oxygen eliminates:

transportation cost

storage tank rental

evaporation losses

This is especially advantageous for remote mines.

Reliable Oxygen for Remote Locations

The system does not rely on external delivery schedules.

Environmentally Responsible

Lower cyanide consumption and improved leaching efficiency contribute to better environmental performance.

Standard Configurations

PSA oxygen generator (10–500 Nm³/h)

Air compressor

Refrigerated dryer / desiccant dryer

Air storage tank

Oxygen buffer tank

Stainless steel oxygen pipeline manifold

PLC/SCADA smart control cabinet

Optional Enhancements

High-pressure oxygen boosting up to 150 bar

Remote monitoring

Oxygen injection skid for CIL/CIP/heap leach

Integrated containerized design

All-weather mining enclosure

Containerized Oxygen Enrichment Plant

A turnkey solution built inside a 20ft or 40ft ISO container, suitable for:

quick site deployment

mining camps in high altitude areas

harsh climates

Features:

internal lighting & ventilation

noise-reducing compressor section

protected wiring & pipeline layout

ready-to-run installation

Customization Options

To adapt to diverse mining operations, system customization is available:

Capacity scaling from 5 Nm³/h to over 1,000 Nm³/h

Oxygen purity tuning based on DO requirements

Multi-stage oxygen distribution for large CIL trains

Oxygen flow modulation systems

Redundant PSA lines for >99% uptime

Technical Specifications (Typical)

 

Values vary depending on project requirements.

Oxygen Purity: 90–95%

Flow Rate: customer-specified

Operation Pressure: 0.4–0.6 MPa (higher optional)

Power Supply: 380–460V / 50–60Hz

Ambient Temperature Range: –20°C to 55°C (extended optional)

Control: Siemens/PLC automation

 

Installation & Integration

 

The system can be connected seamlessly to existing gold extraction infrastructure:

For CIL/CIP:

Fine bubble diffusers

Injector nozzles

Oxygen lances

For Heap Leaching:

Drip line integration

Subsurface aeration pipes

Saturated solution dissolver

Installation requires only a stable foundation and utility connection.

Maintenance & Support

 

The plant is designed for low maintenance:

• periodic filter replacement
• scheduled compressor servicing
• annual adsorbent inspection

Comprehensive support can include:

• on-site commissioning
• operator training
• remote diagnostics
• spare parts program

Why Choose an Oxygen Enrichment Plant for Cyanidation?

 

Operational Independence

Produce oxygen on demand without relying on delivered LOX.

Cost Stability

Avoid fluctuations in oxygen delivery pricing.

Process Optimization

Maintain consistent DO levels in all leaching stages.

Improved Metallurgical Results

Higher recovery and faster kinetics create long-term economic benefits.

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