The effect of PEG dispersant on the magnetic separation of magnetite (Fe3O4) synthesized from ferrous sulfate solution via co-precipitation method with calcium hydroxide as the precipitant was investigated. The results indicated that a PEG dispersant could significantly affect Fe3O4 recovery. Adding PEG during the preparation of Fe3O4 was unfavorable for Fe3O4 recovery. When the PEG-6000 concentration was increased from 0 to 8 g/L, the iron grade and median particle size of the Fe3O4 product decreased from 65.58％ and 2.35 μm to 57.79％ and 1.35 μm, respectively. However, adding PEG during the wet milling of the mixed product promoted the subsequent recovery of Fe3O4. When the amount of PEG-200 increased from 0％ to 4％ of the powder mass, the grade of iron in the Fe3O4 product increased from 65.58％ to 68.32％. While the relative molecular mass of PEG at an amount of 4％ of the powder mass increased from 200 to 20000, the grade of iron was reduced from 68.32％ to 66.70％.%以CaOH为沉淀剂通过共沉淀从绿矾溶液中回收Fe3O4,研究分散剂PEG对Fe3O4磁分离的影响.结果表明,分散剂PEG对Fe3O4的回收有显著影响.在Fe3O4制备过程中添加PEG不利于Fe3O4的回收.当PEG-6000浓度从0增加到8 g/L时,Fe3O4产品的铁品位从65.58％降至57.79％,中值粒径从2.35μm降至1.35μm.然而,在混合产物的湿磨过程中添加PEG可促进随后的Fe3O4回收.当PEG-200用量从粉末质量的0％增加到4％时,Fe3O4产物中铁的品位从65.58％ 升高到68.32％.当PEG-200用量为4％时,改变PEG相对分子质量从200增加到20000,Fe3O4产物中铁品位从68.32％降至66.70％.
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