How Double-Impeller Leaching Agitation Tanks Improve Gold Recovery

 In gold CIP and CIL production lines, the leaching agitation tank is the heart of the process. Traditional single-impeller tanks often suffer from uneven mixing, sedimentation, high energy consumption, and serious carbon abrasion. Today, more and more mines are switching to double-impeller leaching agitation tanks to achieve higher gold recovery and lower operating costs.

The biggest advantage of double-impeller design is stronger and more uniform circulation. The two impellers work together to push slurry downward in the center and upward around the tank, forming a stable cycle. This eliminates dead zones, prevents sand deposition, and ensures every gold particle contacts cyanide and oxygen sufficiently.

Compared with single-impeller machines, double-impeller agitators use larger diameter and lower speed, which reduces wear on activated carbon. In CIP/CIL systems, carbon loss and abrasion directly increase operational cost. Low-speed, large-diameter impellers protect carbon while maintaining strong mixing, greatly reducing consumption.

Another important improvement is hollow shaft aeration. Air enters from the bottom through the hollow shaft and is cut into fine bubbles by the impeller. This improves oxygen dissolution efficiency significantly, accelerating gold leaching kinetics. Uniform micro-bubbles help increase leaching speed and shorten residence time.

Impeller protection is also critical. High-quality leaching tanks use wear-resistant rubber or polyurethane lining on impellers, extending service life and reducing maintenance frequency. This is especially important for continuous industrial production.

Double-impeller leaching tanks also feature compact structure, convenient maintenance, stable operation, and low noise. They adapt to various ore types, including oxide gold ore, weakly refractory ore, and silver‑bearing ore. Many mines report noticeable improvement in gold recovery after upgrading to double-impeller leaching agitation tanks.

In conclusion, double-impeller leaching agitation tanks integrate advantages of uniform mixing, efficient aeration, low energy consumption, low carbon wear, and high stability. For modern gold processing plants, this equipment has become a standard configuration to maximize economic benefits.