Coal is valued for its energy content, and, since the 1880s, has been widely used
to generate electricity. Steel and cement industries use coal as a fuel for extraction
of iron from iron ore and for cement production. Coal comes from plant matter, so
technically it’s not a true mineral and is a rock. Coal is extracted from the ground
by mining, either underground by shaft mining through the seams or in open pits.
SGT has excellent relationships with various coal mining companies and sources coal
from Australia, Indonesia, South Africa, Colombia and CIS countries. As geological
processes apply pressure to dead biotic material over time, under suitable conditions
it is transformed successively into following types of coal:
The highest rank of coal, is a harder, glossy black coal used primarily for residential
and commercial space heating. It may be divided further into metamorphically altered
bituminous coal and petrified oil.
Bituminous coal is a dense sedimentary rock, usually black but sometimes dark brown
often with well-defined bands of bright and dull material, used primarily as fuel
in steam-electric power generation, with substantial quantities used for heat and
power applications in manufacturing and to make coke.
Properties range from those of lignite to those of bituminous coal, is used primarily
as fuel for steam-electric power generation and is an important source of light
aromatic hydrocarbons for the chemical synthesis industry.
Lignite, or brown coal, is the lowest rank of coal and used almost exclusively as
fuel for electric power generation. Jetis a compact form of lignite that is sometimes
polished and has been used as an ornamental stone since the Upper.
It’s considered to be a precursor of coal, has industrial importance as a fuel in
some regions, In its dehydrated form, peat is a highly effective absorbent for fuel
and oil spills on land and water. It is also used as a conditioner for soil to make
it more able to retain and slowly release water.
Steam coal is a grade between bituminous coal and anthracite, once widely used as
a fuel for steam locomotives.