When the ultrafine mill operated at half load for 8 hours, it began to add materials to full load without any abnormality, and continued to operate for 15 hours.During this period, the current of the main motor has no abnormal fluctuation, the lubrication of each lubrication point is normal, there is no oil leakage, ore leakage and water leakage, and the temperature of the main bearing is maintained at about 53 ℃.The success rate of ultrafine mill commissioning can be greatly improved by adopting the phased commissioning process.For ultrafine mill commissioning staff, they should be familiar with and master the operation skills and detailed process flow of ultrafine mill commissioning.