one solute is selectively filtered from a mixture of solutes by making use of the difference between the magnetic susceptibilities of the solutes fluid streams of the substances to be filtered are subjected to intense magnetic field gradients to effect the separation or filtration at points of high magnetic gradient or intense magnetic field the substance of greater magnetic susceptibility or the paramagnetic substance distinguished from a non paramagnetic substance is deflected laterally through a path of variable resistance to flow so that it separates from non paramagnetic substance application_number US 42009082 A description the invention is adapted to the separation of fluids or substances which can be converted to fluids as by solution and which differ in magnetic susceptibility the invention does not exclude the separation of gases such as oxygen or nitrogen from air although other methods are available for oxygen and nitrogen separation a particularly advantageous utilization of the invention is in mineral beneficiation and in processing of ores especially those of valuable metals such as molybdenum uranium cobalt chromium and nickel the ore is treated with a solvent that dissolves the desired metal or mineral substance to form a solution of a desired solute together with other unwanted components also solutes specific examples of ore beneficiation are the extraction of uranium from phosphate deposits the enrichment of chromium from low.