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In the flotation system of Chador Malu iron processing plant (Iran), the apatite is floated with fatty acid based collectors. Sodium silicate is also used as iron oxides depressant. While the phosphorous content of the iron concentrate is reduced at an acceptable level (0.047% P), the silica content (3.5% SiO2) is still higher than the required level.This study aimed to find an effective reagent combination...