Low-G Horizontal Centrifuge Primary Concentrator

If you can't see it with the naked eye, the Low-G Centrifuge will recover it. A skilled panner can recover free gold down to 100 mesh, and our Low-G Centrifuge has equal ability for free gold recovery. However, in a production environment, recovery rates using gravity separation methods for gold particles down to 200–300 mesh begin to decline with any gravity separation method. We claim 99% recovery of free gold down to 100 mesh and 80% to 90% recovery down to 200 mesh.

Recovery rates of free gold particles at less than 300 mesh start getting out of reach of physical concentration means and require chemical separation methods. Gold measuring in the 300-mesh range is almost colloidal and tends to stay in suspension in the turbid water. Even in clear water, this ultra-fine gold stays in suspension almost indefinitely in a production environment. Claims of high recovery rates of 300 mesh gold in a production environment using physical (gravity) means are simply not true.

Oro Industries's Low-G Centrifuges are available in three sizes: the 16", the 24", and the 30". All Low-G Centrifuges are primary batch-type concentrators for both alluvial and milled hard rock ores. They are designed and engineered for continuous commercial-duty use and are bulletproof.

The Low-G has the ability to recover finer gold at a higher recovery rate than any other concentrator on the market today. The reason for this is that the Low-G is a centrifugal concentrator, not a gravity concentrator. That means it's not reliant on gravity settlement; the values are forced into the concentrate chambers by centrifugal force. This yields a greater recovery of fine gold.

Since the Low-G is a batch-type concentrator, you can achieve very high concentration ratios with most types of alluvial and hard rock ores. In fact, you achieve a much greater ratio than any gravity concentrator is capable of producing. In most cases, you can run it all day before you retrieve the concentrate from the centrifuge. To retrieve the concentrate, simply slow down the centrifuge, and all of the concentrate will come out within 30 minutes.

After a whole day of production, this concentrate is rich, so be careful how you handle it. The best way is to process it with Oro Industries's Multi-Helix Spiral Cleaner and Finisher. These Spirals are designed to take the centrifuge concentrate and give you fine, clean, and free gold at the highest recovery rate possible.

The setup and operation of the Low-G centrifuge are easy. It needs to be on a level surface of wood, steel, or cement. Each centrifuge has a standard pipe flange feed connection and comes with a swing discharge trough. The trough is down when running production, and you swing it up to retrieve the concentrate into a receiving bin. To operate the centrifuge, set the running speed to its indicated running RPM value located above the tachometer by turning the speed control knob.

Start the water flow and begin feeding the ore. When you are ready to retrieve the concentrate, place a receiving bin under the discharge trough. Stop ore feeding, slow down the water to around 25 GPM, and let it run at full RPM for 10 minutes. This will clean out excess material away from the concentrate. Swing up the discharge trough and start slowing down the centrifuge by turning the speed control knob. Lower the RPMs in increments of 100 every 5 minutes.

At half the running speed, you'll start to see the heaver concentrate and gold beginning to discharge. Keep slowing down the centrifuge by increments of 50 RPMs every few minutes until you reach 200 RPM. At that speed, all the concentrate will come out in 10 to 15 minutes.