Abstract: High pressure grinding roll (HPGR) is a new crushing method designed on the laminated grinding.It has characteristics of high crushing efficiency，low energy consumption，more amount of fine grains，and the subsequent micro-crack within the crushed product is benefit for save energy during the followed grinding operation.Taking an Anshan type hematite ore as the sample，experiments on grinding technology efficiency and bond work index of ball mill were conducted in order to quantitatively evaluate the energy saving effect of HPGR crushing on subsequent grinding operation.The results showed that in the coarse grinding fineness range，the grinding technology efficiency of HPGR products was slightly lower than that of the jaw crusher (JC)，which resulted from HPGR products have a slightly higher yield rate of specified size (-0.074 mm).However，the gap decreased as the grinding fineness increases，and the two grinding technology efficiency was quite the same at the grinding fineness of 85% passing 0.074 mm,as the grinding finess getting finer,the grinding technodogy efficiency began to come back slightly.When the target size of 280，150，105，74 μm，the Bond work index of HPGR products lowered by 9.41%，7.70%，4.97% and 4.28% than that of JC，thus the decrease range is lowered with the target size decreased.It is indicated that HPGR crushing has significant energy saving effect on primary grinding operation.

Key words: Hematite, High pressure grinding roll, Jaw crusher, Bond work index of ball mill, Grinding technology efficiency