$100 Need a small portable self contained Electric Grinder Designed that will quickly grind down all the Magnetite/Hematite to 5 microns.
It must be fast enough to process 400 pounds of Magnetite/Hematite down to 5 microns each hour.
It must also be able to separate out the magnetic particles from the rest of the 10 micron size processed ore.
It must also be designed to prevent sparks from catching the grinding dust on fire. So it can be designed to have the grinding process use water to keep the dust down.
It must be designed to be safe to operate
It must also be designed so it is not loud to operate. I don't want the device to hurt the operators hearing. It needs to operate below 70 decibels.
It must be able to operate for long duration's, and easy to clean up and repair.
The grinder unit should weigh less than 40 pounds.
You must be an Engineer.
I will not consider bids higher that $100.
Good luck bidding.