Senin, 21 Januari 2013

Metode ASTM (American Standard Testing Material)

Metode ASTM (American Standard Testing Material)
         Dalam penentuan jenis tingkatan batubara menurut klasifikasi ASTM ini didasarkan atas persentase karbon padat dan nilai kalori (dalam btu/lb), yang dihitung berdasarkan basis Dry Mineral Matter Free (dmmf)
Tabel Klasifikasi Batubara Berdasarkan ASTM
Class
Group
Fixed Carbon % , dmmf
Volatile Matter Limits, % , dmmf
Calorific Value Limits BTU per pound (mmmf)
Less
Than
Greater
Than
Less
Than
Agglomerating Character
I. Anthracite
1.Meta-anthracite
98
2
Non-
agglomerating
2.Anthracite
92
98
2
8
3.Semianthracite C
86
92
8
14
II. Bituminous
1.Low volatile bituminous coal
78
86
14
22
Commonly
Agglomerating
2.Medium volatile bituminous coal
69
78
22
31
3.High volatile A bituminous coal
69
31
14000
4.High volatile B bituminous coal
13000
14000
5.High volatile C bituminous coal
11500
13000
 Agglomerating
10500
11500
III. Sub-
bituminous
1.Subbituminous A coal
10500
11500
 Non-
agglomerating
2.Subbituminous B coal
9500
10500
3.Subbituminous C coal
8300
9500
IV. Lignite
1.Lignite A
6300
8300
1.Lignite B
6300
Sumber : Annual Book of ASTM Standard

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