Concentrate are two concentration plans in lump and fine concentrate. In the first phase, the ore is crushed for further processing. At the lump concentration plant, lump concentrate is separated from the crushed ore using the sink-and-float method.
The grain size is 12–100 mm. After grinding, feed material from the fine Concentration plant is concentrated into fine concentrate using spiral separators. At the fine concentration plant, the ore is concentrated into fine concentrate using gravitational and highly magnetic .concentration methods.
CHROMITE CONCENTRATE USES
Stainless steels have a high resistance to oxidation and atmospheric corrosion owing mainly to the presence of chromium, which, at levels varying between 10% and 26%, forms a protective oxide film on the surface of the steel.
The low-carbon ferritic stainless steels cannot be hardened by heat treatment; ferritic varieties containing 17% to
18% chromium are used in automobile trim and in equipment for handling nitric acid. High-carbon martensitic stainless steels are used when hardness and abrasion resistance are desired; steels of this type with 13% chromium
are made into cutlery. Nickel and manganese can be added to high-chromium (16% to 26%) stainless steels to form the austenitic types, of which the 18% chromium – 8% nickel variety is probably the best known. In addition to their resistance to oxidation and corrosion, austenitic steels maintain their strength at high temperatures better than do the plain chromium steels. Sometimes molybdenum, tungsten, niobium, or titanium is added to improve strength and corrosion resistance or to stabilize the carbides present. Steels of this type containing up to 26% chromium have excellent oxidation resistance at high temperatures; they are used in furnace parts, burner nozzles,and kiln linings.
Up to 2% chromium is added to low-alloy steel to improve hardenability, wear resistance, and high-temperature
strength. Such steels, containing chromium in combination with other elements, such as molybdenum, nickel,
manganese, and vanadium, are used for springs, roller and ball bearings, dies, rails, and high-strength structures.
Steels containing 6-10% chromium have increased corrosion and oxidation resistance and are used in the form of tubes in the oil industry