Grades of Coking Coal
Grade
Ash Content
Steel Grade –I
Not exceeding 15%
Steel Grade -II
Exceeding 15% but not exceeding 18%
Washery Grade -I
Exceeding 18% but not exceeding 21%
Washery Grade -II
Exceeding 21% but not exceeding 24%
Washery Grade -III
Exceeding 24% but not exceeding 28%
Washery Grade -IV
Exceeding 28% but not exceeding 35%
Grades of Non-coking Coal
Grade
Useful Heat Value (UHV)
(Kcal/Kg)
UHV= 8900-138(A+M)
Corresponding
Ash% + Moisture %
at (60% RH & 40O C)
Gross Calorific Value GCV (Kcal/ Kg)
(at 5% moisture level)
A
Exceeding 6200
Not exceeding 19.5
Exceeding 6454
B
Exceeding 5600 but not exceeding 6200
19.6 to 23.8
Exceeding 6049 but not exceeding 6454
C
Exceeding 4940 but not exceeding 5600
23.9 to 28.6
Exceeding 5597 but not exceeding. 6049
D
Exceeding 4200 but not exceeding 4940
28.7 to 34.0
Exceeding 5089 but not Exceeding 5597
E
Exceeding 3360 but not exceeding 4200
34.1 to 40.0
Exceeding 4324 but not exceeding 5089
F
Exceeding 2400 but not exceeding 3360
40.1 to 47.0
Exceeding 3865 but not exceeding. 4324
G
Exceeding 1300 but not exceeding 2400
47.1 to 55.0
Exceeding 3113 but not exceeding 3865
Grades of Semi-coking and Weakly Coking Coal
Grade
Ash + Moisture Content
Semi coking grade –I
Not exceeding 19%
Semi coking grade –II
Exceeding 19% but not exceeding 24%
Grades of NEC Coal :
Grades
UHV (Kcal/Kg)
Corresponding
Ash% + Moisture %age
A
6200-6299
18.85 – 19.57
B
5600 – 6199
19.58 – 23.91
Top |