Abstract: The iron minerals in a certain iron ore of Yunnan mainly exist in hematite-limonite and siderite with high phosphorus of 1.13%. Researches on iron improving and phosphorus decreasing were made through new process of chlorinating segregation-low intensity magnetic separation. Large amount of experiments showed that the optimal conditions were as follows: coke dosages of reducers 10%，chlorinating agent L4 dosages15%，segregation temperature at 1 000 ℃，segregation time for 45 min，grinding fineness of 85.38% -0.074 mm，and low intensity magnetic separation field intensity 0.16 T. Under this condition，Fe grade and recovery rate of iron concentrate can reach 75.33%~76.44% and 83.63%~85.66% respectively，and phosphorus content decrease to 0.215%~0.218%. 

Key words: High phosphorus iron ore, Chlorinating segregation, Low intensity magnetic separation, Iron improving and phosphorus decreasing