Coal is world’s most abundant fossil fuel formed from the decomposition of organic materials, plants, vegetation that accumulated in swamps to great depths. With burial, the plant material was subjected to high temperatures and pressures over millions of years. This caused physical and chemical changes in the vegetation, transforming it into peat and then into coal.
While being transformed from organic matter (peat) into coal, it underwent various stages like formation of lignite or ‘brown coal ‘, which is the lowest quality of coal, to sub bituminous to bituminous and then anthracite, which is the highest quality and hardest coal.
High-rank coals are high in carbon and therefore heat value, but low in hydrogen and oxygen. Low-rank coals are low in carbon but high in hydrogen and oxygen content. In addition to carbon, coals contain hydrogen, oxygen, nitrogen and varying amounts of sulphur.
Use of Coal
Coal has many important uses worldwide. The most significant uses are in electricity generation. Not only does coal provide electricity, it is also an essential fuel for steel and cement production. Other important users of coal include paper manufacturers, chemical and pharmaceutical industries.
We can supply 100-250k of very low sulfur clean bituminous coal from usa; cif or fob. We prefer end users, however would work with trading companies that can demonstrate capability. If interested contact us for more details.
Calorie value (arb), 4200 kcal/kg
Total moisture(arb), 30% - 35%
Inherent moisture(adb), 10% - 12 %
Ash content(adb), 6% -8%
Volatile matters(adb), 35% - 42%
Fixed carbon(adb), by difference
Total shulphur(adb), < 0.8%
Hgi index point, 43 up
Size, 0-55 mm (90%)
Price fob geared mv is the best
Specification
Chemical composition ,Guarantee (%)
Fe 64.3%
SiO2 ,4.25%
Ai2O3 ,1.80%
P ,0.005%
S ,0.2%
MgO ,<0.05%
Moisture ,0.07%
Physical ,On natural basis
Size ,0 to 3” 70% Min
Above ,3” 30% Max FNN
Gross calorific value (adb) 6300 kcal/kg
Total moisture (ar) 14 % max
Inherent moisture (adb) 10 % max
Ash content (adb) 12 % max
Volatile matter (adb) 43.00 % max
Fixed carbon (adb) By difference
Sulphur (adb) 1.0 % max
Hard grove grind ability 40 min
Index(hgi)
Size (90% passing min) 0 û 50 mm
Reject 5900
6100 kcal/kg
15 % max
12 % max
10 % max
43 % max
By difference
1.0 % max
45-55 min
0 û 50 mm
Reject 5800
6000 kcal/kg
15 % max
12 % max
10 % max
43 % max
By difference
1.0 % max
45-55 min
0 û 50 mm
Reject 5600
5800 kcal/kg
23 % max
14 % max
8 % max
43 % max
By difference
1.0 % max
45-55 min
0 û 50 mm
Reject 5300
(type b)
5500 kcal/kg
27 % max
16 % max
5 % max
43 % max
By difference
0.5 % max
45-55 min
0 û 50 mm
Reject 5300
(type a)
5500 kcal/kg
30 % max
16 % max
6 % max
Nagaland coal is very appropriate for its use in brick kilns, steel industry etc. Specifications of good quality nagaland coal are gcv ( 7000+), ash 2.75%, moist 3.21%, vm 44.69%, fc 49.35%, sulphur 2.94%.
Assam coal is suitable for coke plants and steel and rolling mills.
The specificaions of assam coal are ash 6-9%, moist 2-2.5%, vm 40-45%, fc 47-50%, sulphur 2-2.5%. Caking index 22-25 and swelling index 4.5 .
The high quality arunachal coal is suitable for coke plants and steel industry apart from brick kilns, cement industry etc. The average analysis figures of all the available coal are: ash 5-10%, volatile matter 38 to 42%, moisture 1.8 to 2.5%, and sulphur 2 to 3.59%. The sulphur is both of organic and inorganic origin. The coal has extremely low phosphorus (0.001-0.008%). It is a highly caking coal, the caking index varying from 17 to 24 (b.S.S.). The swelling index varies from 2.5 to 4 and the calorific value is as high as 11, 970 to 13, 410 b.Th u./1b.
