细粒赤铁矿对淀粉与石英吸附特性影响及机理研究

Effect of Fine Hematite on Adsorption Properties of Starch with Quartz and Its Mechanism Research

通过不同粒度赤铁矿、石英单矿物及两者混合矿与淀粉抑制剂的吸附作用试验,结合FT-IR、AMF检测分析及表征,旨在分析细粒赤铁矿对石英与淀粉作用影响,为鞍山式细粒赤铁矿浮选过程的优化提供理论指导。试验结果表明:当吸附温度为35℃、矿浆pH值为11.5、淀粉浓度为3 g/L、吸附时间为5 min时,淀粉与赤铁矿、石英作用差异最大;随着淀粉浓度的增加,-0.037 mm粒级的细粒赤铁矿与其吸附作用强度明显增强;淀粉在赤铁矿表面发生了以范德华力为主的多分子层物理吸附,在石英表面的发生了多分子层的物理吸附,且存在吸附滞后现象。-0.045 mm的细颗粒赤铁矿含量为34.6%~88.4%时会削弱淀粉的抑制作用,导致铁精矿进入尾矿,降低浮选指标。

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.