通过不同力场中微细粒赤铁矿及石英颗粒的沉降及受力特性研究，得出分散-选择性絮凝是微细颗粒有效分选的途径。采用沉降实验考查了不同分散剂的种类、pH值、搅拌速度对赤铁矿、石英的分散行为影响规律。结果表明，三种分散剂对赤铁矿分散效果由强至弱的顺序为：六偏磷酸钠＞焦磷酸钠＞碳酸钠。通过Zeta电位测定和DLVO理论计算，分析了六偏磷酸钠提高赤铁矿分散行为的作用机理。%Through subsidence and stress characteristics study of fine oolitic hematite and quartz particles in different force field ,dispersion-selective flocculation was regarded as effective separation way for fine particles . Influences of dispersion type , pH , stirring speed on the dispersion before selective flocculation of fine hematite particle were investigated by sedimentation experiments .The results shows that three kinds of dispersion agents in the same concentration ,the order of fine hematite and quartz dispersion was sodium hexametaphosphate > sodium pyrophosphate > sodium carbonate .The dispersion mechanism of sodium hexametaphosphate on the fine hematite minerals was confirmed by measurements of zeta potentials and DLVO theory .
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