JKL FH-24 Automatic Sampler for Filter Discharge and Moisture Control

The JKL FH-24 is a linear-path automatic sampler specifically engineered for the representative sampling of filter discharge streams (filtered concentrate or filter cake), while enabling reliable moisture determination for metallurgical accounting and operational process control.

This unit forms part of JKL Mineral Dressing’s specialized sampling systems, designed in accordance with internationally recognized sampling standards (ISO 13909 / ISO 12743 applicable to mineral concentrates).

1. Operating Principle

The JKL FH-24 operates through a full cross-stream cutter mechanism that uniformly intercepts the entire free-falling stream of material discharged from the filter.

• The system performs a controlled linear stroke (up to 24 inches).
• The cutter spoon traverses the complete cross-section of the falling stream.
• The collected sample increment is discharged into a receiving box (approx. 7 L capacity).
• Cutting frequency is programmable and fully synchronized with PLC control systems.

This operating principle ensures:

• Equal probability of particle selection.
• Elimination of systematic sampling bias.
• Statistical repeatability and sampling precision.

2. Main Components

The system comprises:

• Stainless Steel Cutter Spoon: Geometry specifically designed to fully intercept the filter discharge without inducing segregation or disturbance of the particle stream.
• Heavy-Duty Stainless Steel Sample Carrier Bar: Engineered for abrasion resistance and corrosion protection under wet concentrate conditions.
• Electro-Mechanical Drive Assembly
  • Industrial gearmotor (approximately ¾ HP in comparable configurations).
  • Controlled linear motion system.
  • Constant cutter velocity throughout the traverse.
• Position and Safety Sensor System (IP66 Limit Switches): Ensures precise stroke positioning, operational interlocking, and safe operation.
• Inspection Windows: Allow visual verification of internal mechanical components and operating condition.
• Sample Receiving Box (≈ 7 liters): Removable and sealed design to prevent loss of fines and minimize moisture evaporation.
• Flanged Mounting Plate: Facilitates structural integration into the filter discharge chute.
• Quick-Access Top Cover: Provides rapid access for inspection, preventive maintenance, and cleaning operations.

3. Key Technical Features

• Type: Linear automatic sampler for filtered discharge streams
• Application: Filtered mineral concentrates and filter cake
• Maximum stroke: 24 inches
• Construction: Structural carbon steel frame with critical components in stainless steel
• Electrical protection rating: IP66
• Control integration: PLC compatible / dedicated power and control panel
• Operation: Fully automatic and programmable

4. Moisture Control Application

The JKL FH-24 enables representative increment collection for:

• Determination of % moisture in mineral concentrates
• Dry tonnage adjustment calculations
• Commercial weight validation
• Performance monitoring of filter presses or disc filters

By performing full cross-stream cuts rather than partial interception, the system prevents:

• Under-sampling of coarse particles
• Loss of wet fine fractions
• Size segregation bias

5. Technical Advantages Compared to Manual Sampling

6. Benefits for Metallurgical Accounting

Implementation of the JKL FH-24 at filter discharge points allows:

• Reduction of the Fundamental Sampling Error (FSE)
• Minimization of delimitation and extraction errors
• Full traceability of commercial samples
• Increased confidence in metallurgical settlements
• Reduced commercial disputes

In operations where concentrate is sold under contract, moisture accuracy directly impacts:

• Payable dry metric tons
• Penalties for excess moisture
• Correct dry-grade determination

7. Integration within JKL Sampling Systems

The JKL FH-24 may operate:

• As an independent moisture control sampling point
• Integrated within a Modular Sampling System (SMM)
• With a dedicated power and control panel (PLC synchronization, Profibus communication available)

Technical Conclusion

The JKL FH-24 Automatic Sampler constitutes a robust and purpose-built solution for filter discharge sampling in concentrator plants. It guarantees statistically valid, repeatable sampling in compliance with international standards, while optimizing metallurgical accounting accuracy and commercial moisture control performance.