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|An experimental induration facility has been developed and used for conducting iso- thermal tests and plant simulation studies on the thermal induration of iron ore pellets. The influence of time, temperature, lime content, ore type, shale content and particle-size dis- tribution (e.g. Blaine Index) is being studied in a continuing programme. The present paper deals with experiments relating to the first three of these parameters and illustrates the use of an experimental design suitable for statistical analysis. The relations between isothermal data and the results of complete simulation rests are discussed.|