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Status : Withdrawn
Standard Type : Main
Document No :
Document Year : 1994
Pages : 13
Edition : 1
Section Volume : Physical testing (ISO/TC 102/SC 3.)
The principle of the method specified is determination of swelling of fired iron ore pellets of a specified size range under isothermal reduction, determination of the volume of pellets before and after reduction at a temperature of 900 °C, using a reducing gas consisting of carbon monoxide and nitrogen, calculation of the free-swelling index, expressed as a percentage, using the difference between the two volumes.