Lignito

Lignito

O lignito é un carbón mineral que se forma por compresión da turba, converténdose nunha substancia esnaquizábel na que aínda se poden recoñecer algunhas estruturas vexetais. É de cor negra ou pardo e frecuentemente presenta unha textura similar á da madeira da que procede.

A súa concentración en carbono varía entre o 60% e o 75% e ten moito menor contido en auga que a turba.

É un combustible de mediana calidade, fácil de queimar polo seu alto contido en volátiles, pero cun poder calorífico relativamente baixo (entre 10 e 20 MJ/kg). Ten a característica de non producir coque cando se calcina en vasos pechados.

Composición Típica

COMPOSICIÓN TÍPICA
Carbono 69 %
Hidróxeno 5,2 %
osíxeno 25 %
Nitróxeno 0,8 %
Materias volátiles 40 %

Xacementos

En España os xacementos máis importantes localízanse en Andorra (Teruel), Mequinenza (Zaragoza) e As Pontes de García Rodríguez (A Coruña).

Véxase tamén

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