Abstract: Aiming at sodium silicate was adopted as the dispersant in the past sulfur dressing test at Luohe iron ore, sulfur dressing reagent investment would increase in future practical production, also made final tailings hard to settlement,so,Luohe iron ore flotation reagent system optimization research was done.Comparison was done between verify designed flotation reagent system test and optimize flotation reagent system test.Finally,on the premise of available sulfur content of raw ore was 6.0%,sulfur concentrate of available sulfur content 39.27% and recovery rate 70.12% were obtained in verify designed flotation reagent system test;Through flotation reagent system optimization,sulfur concentrate of available sulfur content 35.05% and available sulfur recovery rate 77.87% were obtained without sodium silicate.Test results indicates,influence to beneficiation index is little with or without sodium silicate,so this reagent could be cancelled,which achieve the goal of energy saving and the economic benefits is remarkable.

Key words: Luohe iron ore, Flotation, Sodium silicate, Sulfur dressing