Abstract: There is 28.74% iron in an iron ore in Liaoning，iron mainly exists in form of hematite.To determine proper comminution process，comminution characteristics research on the ore were conducted.Bond work index test indicated，Bond work index of ore is 8.66 kWh/t，and the ore belongs to medium-hard category and can be dealt with semi-autogenous grinding process.In order to further investigate crushing characteristics of ore in semi-autogenous grinding machine，impact crushing test and abrasion crushing test were carried out.Result shows that model of ore impact grinding is t₁₀=80.82×(1-e-0.53×Ecs),A×b=42.8，the resistance to crushing the ore belongs to the category of medium-hard.And the abrasion index T_a=0.28，its abrasion resistance belongs to the hard category.Experiment results can provide basic data support for rational grinding method of the mineral.

Key words: Comminution characteristics, Bond work index, Drop weight test, Comminution model, Abrasion resistance index