Abstract: In order to analyze the effect of fine hematite on the interaction between quartz and starch inhibitors,the adsorption experiments of different particle sizes of hematite,quartz single mineral and their mixture with starch inhibitors were studied,and FT-IR and AMF were used to analyze and characterize,which could provide theoretical guidance for optimizing flotation process of Anshan-type fine hematite.The results showed that when the adsorption temperature was 35 ℃,the pulp pH value was 11.5,the concentration of starch inhibitor was 3 g/L,and the adsorption time was 5 min,the starch inhibitor had the greatest difference with hematite and quartz.And with the increase of starch concentration,the adsorption strength of -0.037 mm fine hematite particles was significantly enhanced.The physical adsorption of starch inhibitor on the fine hematite surface is dominated by multimolecular layers adsorption based on van der Waals force,and the physical adsorption of starch inhibitor on quartz surface occures in the multi-molecular layer,and there exists adsorption hysteresis.When the content of -0.045 mm fine hematite particles was 34.6%~88.4%,the inhibition of starch could be weakened,resulting in iron concentrate entering tailings and reducing the flotation indexes.

Key words: fine hematite, quartz, absorption reaction, starch