详情
SpecificationsGrades of Iron Ore: High grade (more than *5% Fe),
Medium grade (between *2% and *5% Fe), Low grade (less than *2%
Fe). Description Iron Ore is the primary raw material used in the
production of steel- combined with steel, it constitutes the
world's second largest commodity bloc by value. The largest
producing countries of Iron Ore are Australia, Brazil, India, South
Africa and China. Iron Ore is categorized by dint where it is
produced and priced, and by its ferrous content, expressed as a
percentage. The most merchantable grades lie between *8%, *2%,
*2.5%,, *3% and *5%. A simple way to look at Iron Ore is that it
starts as fines (heavy grains, like sand), is turned into pig iron,
which in combination with coking (metallurgical) coal, and energy
can then produce crude (liquid) steel, which is finished (rolled)
into either in long (e.g. Rebar) or flat (Hot Rolled Coil) form.
Types of Iron Ore Hematite - Fe2O3 - Fe *0% Magnetite - Fe3O4 - Fe
*2% Limonite - Fe2O3 + H2O - Fe *0% to *6% Hematite known as
"natural ore". It is known iron oxide, because the chemical makeup
of hematite includes both iron and oxygen. When iron is extracted
from hematite includes both iron and oxygen. When iron is extracted
from hematite for indutrial purposes, metallurgists remove oxygen
from the hematite until only iron is left. Hematite is usually
available in red, grey and brown colour. Magnetite is metallic
iron, which is virtually unknown on the surface of the Earth except
as iron- nickel alloys from meteorites and very rare forms of deep
mantle xenoliths. Although iron is the fourth most abundant element
in the Earth's crust, comprising about 5% the vast majority is
bound in silicate or more rarely carbonate minerals. The
thermodynamics barriers to seperating pure iron from these minerals
are formidable and energy intensive, therefore, all sources of iron
used by human industry exploit comparatively rarer iron oxide
minerals, the primary form which is used being hematite. Magnetite
is found in greyish black or iron black colour. Lemonite is a
native hydrous ferric oxide of variable composition that is an ore
of iron. A very common material in the oxidized zones of iron-
bearing deposits, it is produced by the decomposition of many iron
minerals, particularly pyrite, with water being retained in varying
amounts. Lemonite is available in yellow, orange, reddish, brown
and brownish black colour.
