ore processing is a 24 hour operation. ore is stockpiled (1) at the processing plant, and the process begins by feeding the ore into a hopper with a loader. the ore is conveyed, and lime is added (2) to raise the ph of the ore. following crushing through a jaw crusher (3), the ore is fed into the semi autogenous grinding (sag) mill (4) along,iron processing britannica,iron ore is one of the most abundant elements on earth, and one of its primary uses is in the production of steel. when combined with carbon, iron changes character completely and becomes the alloy steel. iron processing, use of a smelting process to turn the ore into a form from which products can be fashioned.