ISO 8264:1989 Hard coal — Determination of the swelling properties using a dilatometer
A test piece, in the form of a pencil, prepared from powdered coal is heated at a constant rate in a steel retort positioned in a furnace, the temperature monitoring System having been previously calibrated using two reference metals of known melting Points. The Change in level of a Piston restiny upon the test piece is observed continuously, and a record is produced which is characteristic of the swelling properties of the coal.
Scope
This International Standard specifies a method for the measurement of the swelling of hard coal using a dilatometer.
Principle
A test piece, in the form of a pencil, prepared from powdered coal is heated at a constant rate in a steel retort positioned in a furnace, the temperature monitoring System having been previously calibrated using two reference metals of known melting Points. The Change in level of a Piston restiny upon the test piece is observed continuously, and a record is produced which is characteristic of the swelling properties of the coal.
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