When I change the gravy thick gunk from my slab saw, I would like
to reclaim any of the oil from the rock particles...Are there
special ways to separate the oil from the rock dust?
Yes but my method is messy and time-consuming. You’ll need a large
brown paper grocery bag or two, a large metal screen that will fit
over an adequate-sized container to catch the oil, and a place to
store the whole shebang for the time needed for the process.
I usually put one big paper bag inside the other, and trowel the saw
sludge into the bag (after setting it atop the screen which is atop
the plastic bucket or whatever). The fine rock dust that makes up the
sludge will eventually release the oil into the container via
gravity. If you can allow 3 or even 4 months for the process that’s
ideal. The longer it sits, the more oil you’ll salvage. The grocery
bags function as an excellent filter. The residue is very clean and
When I’m doing a lot of sawing I have enough oil on hand to keep the
filtering process going continuously while having enough fresh oil
to keep the saw filled all the time.