Hard Rock Gold Ore Beneficiation Process Flow

I. Hard Rock Gold Ore Beneficiation Process Flow
Addressing the characteristics of hard rock gold ores—"high hardness and fine-grained dissemination"—modern beneficiation processes adopt a technological chain of "multi-stage crushing + closed-circuit grinding + centrifugal concentration + precision separation" to maximize gold recovery. The core process is as follows:

Jaw Crusher + Cone Crusher

1. Primary Crushing with Jaw Crusher

• Function: Crushes run-of-mine ore to ≤150mm, laying the foundation for subsequent fine crushing.

• Advantages: High reduction ratio, low failure rate, suitable for primary crushing of large ore blocks.

  

2. Secondary Crushing with Cone Crusher

• Function: Further crushes ore to 10-30mm, enhancing grinding efficiency.

• Advantages: Utilizes the interparticle crushing principle, ensuring uniform product size and reducing energy consumption by 20%.

  

Ball Mill + Spiral Classifier
3. Closed-Circuit Grinding with Ball Mill & Spiral Classifier
* Function: The ball mill grinds ore to below 0.074mm. The spiral classifier separates coarse and fine particles, with coarse sands returned for regrinding and fine slurry proceeding to separation.
* Advantages: The closed-circuit loop reduces over-grinding and saves 15%-30% in energy consumption.

Centrifugal Gold Concentrator
4. Roughing with Centrifugal Concentrator
* Function: Utilizes a centrifugal force field to rapidly concentrate gold-bearing heavy minerals, achieving a recovery rate exceeding 85% for the rough concentrate.
* Advantages: High processing capacity, ranging from 10 to 50 tons per hour.

5. Cleaning with Shaking Table (For Centrifugal Concentrate)

• Function: Performs precise separation on the rough concentrate, elevating gold grade to above 90%.

• Advantages: Accurate separation of fine gold particles, with tailings grade ≤0.2g/t.

  
  

  

Spiral Chute
6. Scavenging with Spiral Chute (For Centrifugal Tailings)
* Function: Recovers residual fine gold from tailings, increasing total recovery by 5%-8%.
* Advantages: Non-powered design, resulting in extremely low operating costs.

II. Technical Highlights of Core Equipment

1. Jaw Crusher

• Heavy-Duty Moving Jaw Plate: Made of high manganese steel, extending service life by 3 times.

• Hydraulic Adjustment System: Enables quick adjustment of discharge size to adapt to different ore types.

2. Cone Crusher

• Intelligent Control System: Monitors main shaft speed and pressure in real-time to prevent blockages.

• Modular Design: Reduces liner replacement time to 2 hours.

3. Ball Mill + Spiral Classifier Combination

• Variable Frequency Drive: Automatically adjusts rotational speed based on ore hardness, saving 10%-15% energy.

• Wear-Resistant Spiral Blades: Service life exceeds 12 months, reducing maintenance costs by 40%.

4. Centrifugal Concentrator

• Particularly suitable for recovering fine gold particles below 0.2mm (0.074~0.10mm), commonly used for recovering liberated gold in placer or lode gold deposits.

5. Shaking Table & Spiral Chute

• Composite Bed Surface Material (Shaking Table): Corrosion-resistant and wear-resistant, suitable for acidic pulp environments.

• Fiberglass Material (Spiral Chute): Lightweight design with adjustable slope, suitable for fine particle separation.

IV. Conclusion
This process flow tackles the challenges of hard rock gold ore beneficiation through the "efficient crushing + precision separation" technology chain. Coupled with intelligent core equipment, it can achieve a gold recovery rate exceeding 90% and a reduction in overall costs by 25%. It is a readily deployable solution for both small-to-medium scale mines and large-scale processing plants, maximizing the value of mineral resources.