Characteristics of coal sorts
DR Coal
Grade-D coal, sort DR – Rough coal, green steam coal, grain-size fraction per GOST 19242-73 – 0-300 (200) mm
Humidity in working condition, % (Wrt) 15,0
Hydroscopic humidity, % (Wru) 9,0
Analytic humidity, % (W a) 5,0
Ash content in dry condition, % (Ad) 9,0
Solid (fixed) carbon, % (Cfdaf) 57,0
Volatile-matter content in dry ash-free condition, % (Vdaf) 42,5
Mass fraction of total sulfur content in dry condition, % (Sd) 0,39
Combustion heat in dry condition, kcal/kg (Qri) 5500
Combustion heat in dry ash-free condition, kcal/kg (Qdaf) 7500
Carbon content in dry ash-free condition, % (Cdaf) 77,5
Hydrogen content in dry ash-free condition, % (Hdaf) 5,3
Nitrogen content in dry ash-free condition, % (Ndaf) 1,9
Oxygen content in dry ash-free condition, % (Odaf) 16,5
Chlorine content, % (Cl) 0,04
Arsenic content, % (Asd) 0,0006
Phosphorus content, % (Pd) 0,046
Internitite volume  content, % (I) 11,0
Exinite (liptinite) volume  content, % (L) 2,0
Vitrinite volume  content, % (Vt) 86,0
Vitrinite reflectance rate, % (Ro) 0,44
Fusainized components content, % (OK) 11,0
Roga index, ед. (RI) 0
Ash chemical composition
Silicon oxide, % (SiO2) 48,2-60,0
Aluminum oxide, % (Al2O3) 22,0-25,0
Iron oxide, % (Fe2O3) 5,6
Calcium oxide, % (CaO) 8,4
Magnesium oxide, % (MgO) 1,3
Titanium oxide, % (TiO2) 0,7
Manganese oxide, % (MnO2) 0,01
Phosphorus oxide, % (P2O5) 0,5
Sulfur oxide, % (SO3) 6,5
Sodium oxide, % (Na2O) 0,9
Potassium oxide, % K2O) 1,5
Ash fusibility – deformation temperature, оС (Т1) 1320
Ash fusibility - hemispherical temperature, оС (Т2) 1350
Ash fusibility – yield temperature, оС (Т3) 1390
Grain-size fraction, mm 0-300
DOMSSH Coal
1
Grade-D coal, sort DOMSSH (5400-5500) – Nut coal+Dross coal+Rice coal+Culm, green steam coal, grain-size fraction per GOST 19242-73 – 0-50 mm
2
Grade-D coal, sort DOMSSH (5150-5250) – Nut coal+Dross coal+Rice coal+Culm, green steam coal, grain-size fraction per GOST 19242-73 – 0-50 mm
Grain-size fraction, mm
1
0 – 50
2
0 – 50
Total humidity in working condition, % (Wrt) 14,5 – 16,5 16,0 – 18,5
Ash content in dry condition, % (Ad) 8,5 – 10,5 9,0 – 12,5
Volatile-matter content in dry condition, % (Vd) 36,5 – 39,5 36,5 – 39,5
Volatile-matter content in dry ash-free condition, % (Vdaf) 39,0 – 43,0 39,0 – 43,0
Mass fraction of total sulfur content in dry condition, % (Sd) 0,3 – 0,7 0,5 – 0,8
Chlorine content in dry condition, % (Cld) 0,02 0,03
Arsenic content in dry condition, % (Asd) 0,0003 0,0003
Upper combustion heat in dry condition, kcal/kg (Qdi) 6880 6700
Upper combustion heat in dry ash-free condition, kcal/kg (Qdaf) 7480 7480
Lower combustion heat in dry condition, kcal/kg (Qri) 5490 5150 – 5250
Mass fraction of mineral impurities, %
DMSSH Coal
Grade-D coal, sort DMSSH
Dross coal+Rice coal+Culm
green steam coal
grain-size fraction
per GOST  19242-73
0-25 mm
Grain-size fraction, mm 0 – 25
Total humidity in working condition, % (Wrt) 15,0 – 18,0
Ash content in dry condition, % (Ad) 9,0 – 13,0
Volatile-matter content in dry condition, % (Vd) 37,0 – 40,0
Volatile-matter content in dry ash-free condition, % (Vdaf) 40,0 – 44,0
Mass fraction of total sulfur content in dry condition, % (Sd) 0,5 – 0,8
Chlorine content in dry condition, % (Cld) 0,02
Arsenic content in dry condition, % (Asd) 0,0003
Upper combustion heat in dry condition, kcal/kg (Qdi) 6650
Upper combustion heat in dry ash-free condition, kcal/kg (Qdaf) 7480
Lower combustion heat in dry condition, kcal/kg (Qri) 5000 – 5200
Mass fraction of mineral impurities, %
DO Coal
Grade-D coal, sort DO
Nut coal
green steam coal
grain-size fraction
per GOST  19242-73
25-50 mm 
Grain-size fraction, mm 25 – 50
Total humidity in working condition, % (Wrt) 14,0 – 16,0
Ash content in dry condition, % (Ad) 7,0 – 9,0
Volatile-matter content in dry condition, % (Vd) 36,0 – 39,0
Volatile-matter content in dry ash-free condition, % (Vdaf) 39,0 – 43,0
Mass fraction of total sulfur content in dry condition, % (Sd) 0,2 – 0,7
Chlorine content in dry condition, % (Cld) 0,04
Arsenic content in dry condition, % (Asd) 0,0003
Upper combustion heat in dry condition, kcal/kg (Qdi) 6870
Upper combustion heat in dry ash-free condition, kcal/kg (Qdaf) 7505
Lower combustion heat in dry condition, kcal/kg (Qri) 5450 – 5550
Mass fraction of mineral impurities, %
Mass fraction of coal dust, % 15
DPKO Coal
Grade-D coal, sort DPKO
Plate coal+lump coal+nut coal
green steam coal
grain-size fraction
per GOST  19242-73
25-300 mm
Grain-size fraction, mm 25 – 300
Total humidity in working condition, % (Wrt) 14,0 – 16,0
Ash content in dry condition, % (Ad) 7,0 – 9,0
Volatile-matter content in dry condition, % (Vd) 36,0 – 39,0
Volatile-matter content in dry ash-free condition, % (Vdaf) 39,0 – 43,0
Mass fraction of total sulfur content in dry condition, % (Sd) 0,2 – 0,6
Chlorine content in dry condition, % (Cld) 0,02
Arsenic content in dry condition, % (Asd) 0,0003
Upper combustion heat in dry condition, kcal/kg (Qdi) 6880
Upper combustion heat in dry ash-free condition, kcal/kg (Qdaf) 7510
Lower combustion heat in dry condition, kcal/kg (Qri) 5500 – 5600
Mass fraction of mineral impurities, % 2
Mass fraction of coal dust, % 10
DPKOM Coal
Grade-D coal, sort DPKOM
Plate coal+lump coal+nut coal+dross coal
green steam coal
grain-size fraction
per GOST  19242-73
13-300 mm 
Grain-size fraction, mm 13 – 300
Total humidity in working condition, % (Wrt) 15,0 – 17,0
Ash content in dry condition, % (Ad) 8,0 – 10,0
Volatile-matter content in dry condition, % (Vd) 36,0 – 39,0
Volatile-matter content in dry ash-free condition, % (Vdaf) 39,0 – 43,0
Mass fraction of total sulfur content in dry condition, % (Sd) 0,2 – 0,6
Chlorine content in dry condition, % (Cld) 0,02
Arsenic content in dry condition, % (Asd) 0,0003
Upper combustion heat in dry condition, kcal/kg (Qdi) 6880
Upper combustion heat in dry ash-free condition, kcal/kg (Qdaf) 7510
Lower combustion heat in dry condition, kcal/kg (Qri) 5400 – 5500
Mass fraction of mineral impurities, % 1,5
Mass fraction of coal dust, % 12
DPK Coal
Grade-D coal, sort DPK
Plate coal+lump coal
green steam coal
grain-size fraction
per GOST  19242-73
50-300 mm
Grain-size fraction, mm 50 – 300
Total humidity in working condition, % (Wrt) 14,0 – 16,5
Ash content in dry condition, % (Ad) 7,0 – 9,5
Volatile-matter content in dry condition, % (Vd) 36,0 – 39,0
Volatile-matter content in dry ash-free condition, % (Vdaf) 39,0 – 43,0
Mass fraction of total sulfur content in dry condition, % (Sd) 0,2 – 0,6
Chlorine content in dry condition, % (Cld) 0,04
Arsenic content in dry condition, % (Asd) 0,0003
Upper combustion heat in dry condition, kcal/kg (Qdi) 6900
Upper combustion heat in dry ash-free condition, kcal/kg (Qdaf) 7520
Lower combustion heat in dry condition, kcal/kg (Qri) 5500 – 5600
Mass fraction of mineral impurities, % 3
Mass fraction of coal dust, % 12
Off-standard coal
Grade-D coal, sort DO – U1 (large-sized)
Nut coal
green steam coal
grain-size fraction  – 30-60 mm
not standardized in GOST regulations
Grain-size fraction, mm 30 – 60
Total humidity in working condition, % (Wrt) 14,0 – 16,0
Ash content in dry condition, % (Ad) 7,0 – 9,0
Volatile-matter content in dry condition, % (Vd) 36,0 – 39,0
Volatile-matter content in dry ash-free condition, % (Vdaf) 39,0 – 43,0
Mass fraction of total sulfur content in dry condition, % (Sd) 0,2 – 0,7
Chlorine content in dry condition, % (Cld) 0,04
Arsenic content in dry condition, % (Asd) 0,0003
Upper combustion heat in dry condition, kcal/kg (Qdi) 6870
Upper combustion heat in dry ash-free condition, kcal/kg (Qdaf) 7505
Lower combustion heat in dry condition, kcal/kg (Qri) 5450 – 5550
Mass fraction of mineral impurities, % -
Mass fraction of coal dust, % 15
Grade-D coal, sort DO – U2 (large-sized)
Nut coal
green steam coal
grain-size fraction  – 40-60 mm
not standardized in GOST regulations
Grain-size fraction, mm 40 – 60
Total humidity in working condition, % (Wrt) 14,0 – 16,0
Ash content in dry condition, % (Ad) 7,0 – 9,0
Volatile-matter content in dry condition, % (Vd) 36,0 – 39,0
Volatile-matter content in dry ash-free condition, % (Vdaf) 39,0 – 43,0
Mass fraction of total sulfur content in dry condition, % (Sd) 0,2 – 0,7
Chlorine content in dry condition, % (Cld) 0,04
Arsenic content in dry condition, % (Asd) 0,0003
Upper combustion heat in dry condition, kcal/kg (Qdi) 6870
Upper combustion heat in dry ash-free condition, kcal/kg (Qdaf) 7505
Lower combustion heat in dry condition, kcal/kg (Qri) 5450 – 5550
Mass fraction of mineral impurities, % -
Mass fraction of coal dust, % 15
Grade-D coal, sort DPK – U (large-sized)
Plate coal+lump coal
green steam coal
grain-size fraction  – 60-300 mm
not standardized in GOST regulations
Grain-size fraction, mm 60 – 300
Total humidity in working condition, % (Wrt) 14,0 – 16,5
Ash content in dry condition, % (Ad) 7,0 – 9,5
Volatile-matter content in dry condition, % (Vd) 36,0 – 39,0
Volatile-matter content in dry ash-free condition, % (Vdaf) 39,0 – 43,0
Mass fraction of total sulfur content in dry condition, % (Sd) 0,2 – 0,6
Chlorine content in dry condition, % (Cld) 0,04
Arsenic content in dry condition, % (Asd) 0,0003
Upper combustion heat in dry condition, kcal/kg (Qdi) 6900
Upper combustion heat in dry ash-free condition, kcal/kg (Qdaf) 7520
Lower combustion heat in dry condition, kcal/kg (Qri) 5500 – 5600
Mass fraction of mineral impurities, % 3
Mass fraction of coal dust, % 12
Grade-D coal, sort DPKO – U (large-sized)
Plate coal+lump coal+nut coal
green steam coal
grain-size fraction  – 30-300 mm
not standardized in GOST regulations
Grain-size fraction, mm 30 – 300
Total humidity in working condition, % (Wrt) 14,0 – 16,0
Ash content in dry condition, % (Ad) 7,0 – 9,0
Volatile-matter content in dry condition, % (Vd) 36,0 – 39,0
Volatile-matter content in dry ash-free condition, % (Vdaf) 39,0 – 43,0
Mass fraction of total sulfur content in dry condition, % (Sd) 0,2 – 0,6
Chlorine content in dry condition, % (Cld) 0,02
Arsenic content in dry condition, % (Asd) 0,0003
Upper combustion heat in dry condition, kcal/kg (Qdi) 6880
Upper combustion heat in dry ash-free condition, kcal/kg (Qdaf) 7510
Lower combustion heat in dry condition, kcal/kg (Qri) 5500 – 5600
Mass fraction of mineral impurities, % 2
Mass fraction of coal dust, % 10
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