Abstract: Ilmenite resources is rich in western Panzhihua area，but it is easy to produce over crush‐ ing phenomenon in the process of fine grinding and separation，which leads to the loss of a large number of ultra-fine ilmenite in the form of slime. In order to improve the utilization rate of resources，the concen‐ tration and desliming test of -38 μm ultra-fine ilmenite was carried out by using CZ100 cyclone. The ef‐ fects of cyclone diameter，grit diameter，overflow pipe diameter，insertion depth，cone angle，feeding pressure and concentration on the classification effect were systematically studied. The optimal combina‐ tion of structural parameters was determined by laboratory test，and further industrial test verification was carried out. The results show that under the conditions of 8 mm grit mouth diameter，32 mm overflow pipe diameter and ore feeding pressure over 0.35 MPa，the industrial continuous operation for 72 h can obtain the stability index of 34.99% grit concentration，63.13% yield and 68% TiO2 recovery rate. The proportion of grit +0.005 mm particle size reaches 95.24%，which effectively realizes the efficient concentration and desliming of ultra-fine ilmenite. The research results provide a feasible technical path for the recovery and utilization of ultra-fine ilmenite in western Panzhihua area.

Key words: ultrafine ilmenite, concentrate and desliming, CZ100 cyclone