Clasificacion del carbón

Coal Classification by ASTM D388 (1997)
Gross Calorific Value Limits, Cal/g (Moist , Mineral-MatterFree Basis) Equal or Greater than … … … … … 7,777 7,222
d d b

FixedCarbon Limits, % (Dry, Mineral-MatterClass Group Free Basis) Equal or Greater than 1. Meta-anthracite 1. Anthracite 2. Anthracite 3. Semianthracite
c

Volatile MatterLimits, % (Dry, Mineral-MatterFree Basis) Greater than … 2 8 14 22 31 … … Equal of Less than 2 8 14 22 31 … … …

Agglomeration Character

Less than … 98 92 86 78 69 … …Less than … … … … … … 7,777 7,222 6,389 6,389 5,833 5,277 4,511 3,500 nonagglomerating agglomerating commonly agglomerating
e

98 92 86 78 69 … … …

nonagglomerating1. Low volatile bituminous coal 2. Medium volatile bituminous coal 2. Bituminous 3. High volatile A bituminous coal 4. High volatile B bituminous coal 5. High volatile Cbituminous coal

6,389 5,833
e

1. Subbituminous A coal 3. Subbituminous 2. Subbituminous B coal 3. Subbituminous C coal 4. Lignite 1. Lignite A 2. Lignite B

… … … … …… … … … …

… … … … …

… … … … …

5,833 5,277 4,611 3,500 …

a b c d e

This classification does not apply to certain coals, as discussed in Note 1. Moistrefers to coal containing its natural inherent moisture but not including visible water on the surface of coal If agglomerating, classify in low-volatile group of the bituminousclass Coals having 69% or more fixed carbon on the dry, mineral-matter-free basis shall be classified according to fixed carbon, regardless of gross calorific value It isrecognized that there may be nonagglomerating varieties in these groups of the bituminous class, and that there are notable exceptions in high volatile C bituminous group