... Magnetic rolls available in 75 and 300mm diameters with widths up to 1000mm and magnetic field 13,000 Gauss. ... industrial minerals applications, such as the beneficiation of abrasive, refractory and ceramic raw material (i.e., alumina, silica, carbide, magnesite, quartzite, ... removal of iron silicates from limestone or magnesite, glass raw materials cleaning silica sand, quartz, feldspar, dolomite, etc ...