Lab-scale roller table mill for investigating the grinding behaviour of coal

The test mill is equipped with one roller. The material bed can be discharg ed completely after overrolling. Grinding force, torque and gap width are m easured. Cycle tests with three coals have been performed for simulating a closed circuit process. The grinding behaviour is characterized by the foll owing relations: compaction of the particle bed and specific power draft vs . specific grinding force, production of fine material (dust), circuit fact or, specific surface of the dust and specific work-input of the grinding ci rcuit vs. specific power draft.