Lower grade sources of iron ore generally require beneficiation, using techniques like crushing, milling, gravity or heavy media separation, screening, and silica froth flotation to improve the concentration of the ore and remove impurities. The results, high quality fine ore powders, are known as fines.
The refractory ore treatment processes may be preceded by concentration . Roasting is used to oxidize both the sulfur and organic carbon at high temperatures using air and/or oxygen. Bio oxidation involves the use of bacteria that promote oxidation reactions in an aqueous environment.
The fundamental operations of ore dressing processes are the breaking apart of the associated constituents of the ore by mechanical means and the separation of the severed components into concentrate and tailing, using mechanical or physical methods which do not effect substantial chemical changes.
The method which is not a method adopted in dressing the ore is: Smelting. All the other three options are the methods that are generally used in the dressing of ore. While smelting is a method of extraction of metals from ore. In this process, we obtain metal from ore by the decomposition of ore on heating.
mainly to techniques for dressing raw materials obtained from mines. Such techniques are now classified as me chanical processing in contrast to metallurgical tech niques where the value minerals are chemically altered, such as in the reduction of iron ore to extract metallic iron, and also in contrast to conventional chemi