The grade of limonite ore from a mine in western Hubei mostly is around 40%,and contains high grade sulfur,so has never been reasonably utilized.By adopting Slon high gradient magnetic separator the grade of concentrate can be improved to 53.18% and the recovery can be up to 82.98%.In order to meet the requirements of large scale smelter,the roasting experiment were carried out on the magnetic concentrate.The results showed that the grade of iron concentrate can be more than 65% in optimum conditions.