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Gold Prospecting Forums - General => Machine Assisted Placer Operations => Topic started by: Nathan_j on May 22, 2019, 01:50:04 PM

Title: Attrition scrubber for placer operations
Post by: Nathan_j on May 22, 2019, 01:50:04 PM
Hi everyone, It's been a while!
Hey does anyone know of any placer mining developments using attrition scrubbers in heavy clay operations instead of trommel/scrubbers ?
I see that material need to be screen down to 1 - 3 mm or so for traditional attrition scrubbers.  Is there a known design that takes larges sizing( 2 - 4 inch rock ) - this is assuming the ground is at 10% rock (soft mudstone, 90% < 1" ) up to 4", 60% hard-pack clay and 30% sand?
Best,
Nathan
Title: Re: Attrition scrubber for placer operations
Post by: geezir on May 23, 2019, 04:55:26 PM
An attrition scrubber uses opposed pitched impellers to accelerate the particles at each other to break-up bound clay. Some will handle particles up to 1/2 inch. For larger particle size a log washer may be used. -3" is nominal for a log washer but some handle up to -6" 
Title: Re: Attrition scrubber for placer operations
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Title: Re: Attrition scrubber for placer operations
Post by: Nathan_j on May 25, 2019, 10:21:56 PM
An attrition scrubber uses opposed pitched impellers to accelerate the particles at each other to break-up bound clay. Some will handle particles up to 1/2 inch. For larger particle size a log washer may be used. -3" is nominal for a log washer but some handle up to -6"

I appreciate the the help! The ground on our claim is detrital, a glacier 1000 feet thick sat on the deposit for around 10,000 years, causing significant clay and rock compaction - hence the need for a  heavy scrubbing action.
Do you know why one would use a scrubber over a log washer?  Are log washers less in water consumption?  I am not finding much on comparisons.