Abstract: Crushing tests including size characteristics of centre product influenced by the pressure and speed of the roller and the moisture content of the ore of V-Ti magnetite in Panxi area were conducted using high pressure grinding roller.The centre product can almost pass sieve mesh of 5mm under the condition of that the pressure of the roller is 5.6 N/mm2, the speed of the roller is 0.195 m/s and the moisture content of the ore is less than 7%, the productivity of -3.2 mm of which is 91.05%, and the productivity of -0.074 mm of which is 15.29%.The P₈₀ of the centre product is reduced to 1.55mm and the ratio of reduction is up to 10.Tests of size characteristics influenced by technology of different circulation of edge product and the closed-cycling were also performed.

Key words: V-Ti magnetite in Panxi, High pressure grinding roller, Size characteristics