利用两步法合成非离子表面活性剂失水山梨醇油酸酯（1．3）聚氧乙烯醚，通过Washburn方程测得捕收剂在SiO2颗粒表面接触角，探索油酸钠和环烷酸钠混合溶液对二氧化硅在常温的可浮性。结果表明：T w een‐1．3使油酸钠临界胶束浓度明显增大。经T w een‐1．3分散油酸钠‐环烷酸钠可使赤铁矿反浮选温度从40℃降低到23℃，通过一粗一精三扫闭路试验，获得了精矿品位为68．63％，收率为90．20％的良好指标。%The nonionic surfactant sorbitan oleate(1 .3) polyoxyethylene ether was synthesized by using a two‐step synthesis method .The surface tension and contact angle on SiO2 particle surface were measured through the Washburn equation to explore the floatability of silica with a mixed solution of sodium oleate and naphthenate at room temperature .The results show that adding Tween‐1 .3 can increase the critical micelle concentration of sodium oleate and the dispersion of mixed solution significantly ,which makes the reverse flotation temperature of hematite reduced from 40 ℃ to 23 ℃ .An iron concentrate with Fe grade of 68 .63% and Fe recovery of 90 .20% can be obtained on optimum reagent condition through one roughing‐one refining‐three scavengings closed‐circuit flowsheet .
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