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With the newly developed compound collector DGT-P, flotation tests were carried out for the mixed magnetic separation concentrates of Qidashan iron ore. The optimum reagent regime was determined and the flotation efficiency was investigated. Under the conditions of pulp temperature 20 ℃, pH value=10.0, collector DGT-P dosage 800 g/t, inhibitor corn starch dosage 1200 g/t and no activator added, good flotation indexes of 69.23% concentrate iron grade and 91.52% iron recovery were obtained through the closed circuit process with "one coarse, one fine and one sweep". This study shows that DGT-P is an efficient and highly selective low-temperature collector, which could effectively solve the problem of energy waste in the anionic reverse flotation of iron ores in China.