Gravity Separation & Concentration Methods

Gravity Separation & Concentration Methods

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GOLD WASH PLANT - Water Volume VS Material Volume (3 replies)

5 years ago
Alex 5 years ago

We are currently setting up an Alluvial Gold Wash Plant - (Hopper bin - Vibrating Feeder - Trommel Scrubber - Sluice Box - Vibrating Screen (2mm) - Falcon Concentrator)

We want to process the 75 tons per hour. The clay content is high. And the material doesn't have many rocks/gravels that could help to "break" the clay...

The Scrubber dimensions: 4 meters long X 1.5 meters diameter, and a 2 meters long trommel discharge with 2 screens layers (12mm and 6mm apertures).

What's the Scrubber ideal water consumption? How much water am I need to add on the Scrubber to process 75 tons per hour?

I can use more water on Trommel to wash the screen and supply enough water for the Sluice Box.

As the material doesn't carry many rocks/gravels to help to break the clay, do you have any suggestion that can help with this issue?

wash plant
5 years ago
Deano 5 years ago
1 like by David

Usually you recycle the coarse oversize through the plant with the feed. It cuts down the wash feed rate but this is preferable to having clay balls carrying gold through the tails.

The water requirements have to be found by experiment, you usually have a spray bar inside the trommel to help with the clay break down.

Adding clay breaker helps somewhat but usually not enough to pay for the chemistry and it will bite you when trying to get clean water back from the tailings dam.

5 years ago
Deano 5 years ago

I assume that you have a 300mm wide ring at the bottom of the scrubber section to retain the feed.

You would want to have 4 slotted 150 wide lifters on the ring to keep the oversize moving through the circuit.

You usually have 150mm angle iron longitudinal lifters in the scrubber section, allow 1 lifter per metre of circumference.

What you want is to run the scrubber as a semi SAG mill with the high pressure spray bar adding the majority of the water in the circuit.

Tz Miner
5 years ago
Tz Miner 5 years ago

Hello Alex - Did you get your clay problems solved?

Hello Deano - Interested in your observations about a prewash for heavy clays?

Do you provide tech services?



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