size - the ore must be ground to a size that exposes the desired mineral to the leaching agent referred to as “liberation” , and in tank leaching this must be a size that can be suspended by the agitator. in vat leaching this is the size that is the most economically viable, where the recovery achieved as ore is ground finer is balanced .
mineral oil is generally effective as a transformer oil, but it has some serious disadvantages, of which the worst is its high flammability. if a transformer leaks mineral oil, it can easily start a fire. fire codes often require that transformers inside buildings use a less flammable liquid, or the use of dry-type transformers with no liquid .
magnetic particle inspection mpi is a non-destructive testing ndt process for detecting surface and shallow subsurface discontinuities in ferromagnetic materials such as iron, nickel, cobalt, and some of their alloys.the process puts a magnetic field into the part. the piece can be magnetized by direct or indirect magnetization. direct magnetization occurs when the electric current is .
the magnetic compass is the most familiar compass type. it functions as a pointer to 'magnetic north', the local magnetic meridian, because the magnetized needle at its heart aligns itself with the horizontal component of the earth's magnetic field.the magnetic field exerts a torque on the needle, pulling the north end or pole of the needle approximately toward the earth's north magnetic pole .
dry blowing is a method to extract gold particles from dry soil without the use of water. a machine specialized to use this method is known as a dry blower. it is a form of winnowing. methods. one method is to pour dry soil from a height into a pan, allowing the wind to blow away finer dust. the denser gold particles to fall into the pan.